doc/doc-txt/ChangeLog

   1 Change log file for Exim from version 4.21
   2 ------------------------------------------
   3 This document describes *changes* to previous versions, that might
   4 affect Exim's operation, with an unchanged configuration file.  For new
   5 options, and new features, see the NewStuff file next to this ChangeLog.
   6
   7
   8 Exim version 4.90
   9 -----------------
  10
  11 JH/01 Rework error string handling in TLS interface so that the caller in
  12       more cases is responsible for logging.  This permits library-sourced
  13       string to be attached to addresses during delivery, and collapses
  14       pairs of long lines into single ones.
  15
  16 PP/01 Allow PKG_CONFIG_PATH to be set in Local/Makefile and use it correctly
  17       during configuration.  Wildcards are allowed and expanded.
  18
  19 JH/02 Rework error string handling in DKIM to pass more info back to callers.
  20       This permits better logging.
  21
  22 JH/03 Rework the transport continued-connection mechanism: when TLS is active,
  23       do not close it down and have the child transport start it up again on
  24       the passed-on TCP connection.  Instead, proxy the child (and any
  25       subsequent ones) for TLS via a unix-domain socket channel.  Logging is
  26       affected: the continued delivery log lines do not have any DNSSEC, TLS
  27       Certificate or OCSP information.  TLS cipher information is still logged.
  28
  29 JH/04 Shorten the log line for daemon startup by collapsing adjacent sets of
  30       identical IP addresses on different listening ports.  Will also affect
  31       "exiwhat" output.
  32
  33 PP/02 Bug 2070: uClibc defines __GLIBC__ without providing glibc headers;
  34       add noisy ifdef guards to special-case this sillyness.
  35       Patch from Bernd Kuhls.
  36
  37 JH/05 Tighten up the checking in isip4 (et al): dotted-quad components larger
  38       than 255 are no longer allowed.
  39
  40 JH/06 Default openssl_options to include +no_ticket, to reduce load on peers.
  41       Disable the session-cache too, which might reduce our load.  Since we
  42       currrectly use a new context for every connection, both as server and
  43       client, there is no benefit for these.
  44       GnuTLS appears to not support tickets server-side by default (we don't
  45       call gnutls_session_ticket_enable_server()) but client side is enabled
  46       by default on recent versions (3.1.3 +) unless the PFS priority string
  47       is used (3.2.4 +).
  48
  49 PP/03 Add $SOURCE_DATE_EPOCH support for reproducible builds, per spec at
  50       <https://reproducible-builds.org/specs/source-date-epoch/>.
  51
  52 JH/07 Fix smtp transport use of limited max_rcpt under mua_wrapper. Previously
  53       the check for any unsuccessful recipients did not notice the limit, and
  54       erroneously found still-pending ones.
  55
  56 JH/08 Pipeline CHUNKING command and data together, on kernels that support
  57       MSG_MORE.  Only in-clear (not on TLS connections).
  58
  59 JH/09 Avoid using a temporary file during transport using dkim.  Unless a
  60       transport-filter is involved we can buffer the headers in memory for
  61       creating the signature, and read the spool data file once for the
  62       signature and again for transmission.
  63
  64 JH/10 Enable use of sendfile in Linux builds as default.  It was disabled in
  65       4.77 as the kernel support then wasn't solid, having issues in 64bit
  66       mode.  Now, it's been long enough.  Add support for FreeBSD also.
  67
  68 JH/11 Bug 2104: Fix continued use of a transport connection with TLS.  In the
  69       case where the routing stage had gathered several addresses to send to
  70       a host before calling the transport for the first, we previously failed
  71       to close down TLS in the old transport process before passing the TCP
  72       connection to the new process.  The new one sent a STARTTLS command
  73       which naturally failed, giving a failed delivery and bloating the retry
  74       database.  Investigation and fix prototype from Wolfgang Breyha.
  75
  76 JH/12 Fix check on SMTP command input synchronisation.  Previously there were
  77       false-negatives in the check that the sender had not preempted a response
  78       or prompt from Exim (running as a server), due to that code's lack of
  79       awareness of the SMTP input buferring.
  80
  81 PP/04 Add commandline_checks_require_admin option.
  82       Exim drops privileges sanely, various checks such as -be aren't a
  83       security problem, as long as you trust local users with access to their
  84       own account.  When invoked by services which pass untrusted data to
  85       Exim, this might be an issue.  Set this option in main configuration
  86       AND make fixes to the calling application, such as using `--` to stop
  87       processing options.
  88
  89
  90 Exim version 4.89
  91 -----------------
  92
  93 JH/01 Bug 1922: Support IDNA2008.  This has slightly different conversion rules
  94       than -2003 did; needs libidn2 in addition to libidn.
  95
  96 JH/02 The path option on a pipe transport is now expanded before use.
  97
  98 PP/01 GitHub PR 50: Do not call ldap_start_tls_s on ldapi:// connections.
  99       Patch provided by "Björn", documentation fix added too.
 100
 101 JH/03 Bug 2003: fix Proxy Protocol v2 handling: the address size field was
 102       missing a wire-to-host endian conversion.
 103
 104 JH/04 Bug 2004: fix CHUNKING in non-PIPELINEING mode.  Chunk data following
 105       close after a BDAT command line could be taken as a following command,
 106       giving a synch failure.  Fix by only checking for synch immediately
 107       before acknowledging the chunk.
 108
 109 PP/02 GitHub PR 52: many spelling fixes, which include fixing parsing of
 110       no_require_dnssec option and creation of _HAVE_TRANSPORT_APPEND_MAILDIR
 111       macro.  Patches provided by Josh Soref.
 112
 113 JH/05 Have the EHLO response advertise VRFY, if there is a vrfy ACL defined.
 114       Previously we did not; the RFC seems ambiguous and VRFY is not listed
 115       by IANA as a service extension.  However, John Klensin suggests that we
 116       should.
 117
 118 JH/06 Bug 2017: Fix DKIM verification in -bh test mode.  The data feed into
 119       the dkim code may be unix-mode line endings rather than smtp wire-format
 120       CRLF, so prepend a CR to any bare LF.
 121
 122 JH/07 Rationalise the coding for callout smtp conversations and transport ones.
 123       As a side-benfit, callouts can now use PIPELINING hence fewer round-trips.
 124
 125 JH/08 Bug 2016: Fix DKIM verification vs. CHUNKING.  Any BDAT commands after
 126       the first were themselves being wrongly included in the feed into dkim
 127       processing; with most chunk sizes in use this resulted in an incorrect
 128       body hash calculated value.
 129
 130 JH/09 Bug 2014: permit inclusion of a DKIM-Signature header in a received
 131       DKIM signature block, for verification.  Although advised against by
 132       standards it is specifically not ruled illegal.
 133
 134 JH/10 Bug 2025: Fix reception of (quoted) local-parts with embedded spaces.
 135
 136 JH/11 Bug 2029: Fix crash in DKIM verification when a message signature block is
 137       missing a body hash (the bh= tag).
 138
 139 JH/12 Bug 2018: Re-order Proxy Protocol startup versus TLS-on-connect startup.
 140       It seems that HAProxy sends the Proxy Protocol information in clear and
 141       only then does a TLS startup, so do the same.
 142
 143 JH/13 Bug 2027: Avoid attempting to use TCP Fast Open for non-transport client
 144       TCP connections (such as for Spamd) unless the daemon successfully set
 145       Fast Open mode on its listening sockets.  This fixes breakage seen on
 146       too-old kernels or those not configured for Fast Open, at the cost of
 147       requiring both directions being enabled for TFO, and TFO never being used
 148       by non-daemon-related Exim processes.
 149
 150 JH/14 Bug 2000: Reject messages recieved with CHUNKING but with malformed line
 151       endings, at least on the first header line.  Try to canonify any that get
 152       past that check, despite the cost.
 153
 154 JH/15 Angle-bracket nesting (an error inserted by broken sendmails) levels are
 155       now limited to an arbitrary five deep, while parsing addresses with the
 156       strip_excess_angle_brackets option enabled.
 157
 158 PP/03 Bug 2018: For Proxy Protocol and TLS-on-connect, do not over-read and
 159       instead leave the unprompted TLS handshake in socket buffer for the
 160       TLS library to consume.
 161
 162 PP/04 Bug 2018: Also handle Proxy Protocol v2 safely.
 163
 164 PP/05 FreeBSD compat: handle that Ports no longer create /usr/bin/perl
 165
 166 JH/16 Drop variables when they go out of scope.  Memory management drops a whole
 167       region in one operation, for speed, and this leaves assigned pointers
 168       dangling.  Add checks run only under the testsuite which checks all
 169       variables at a store-reset and panics on a dangling pointer; add code
 170       explicitly nulling out all the variables discovered.  Fixes one known
 171       bug: a transport crash, where a dangling pointer for $sending_ip_address
 172       originally assigned in a verify callout, is re-used.
 173
 174 PP/06 Drop '.' from @INC in various Perl scripts.
 175
 176 PP/07 Switch FreeBSD iconv to always use the base-system libc functions.
 177
 178 PP/08 Reduce a number of compilation warnings under clang; building with
 179       CC=clang CFLAGS+=-Wno-dangling-else -Wno-logical-op-parentheses
 180       should be warning-free.
 181
 182 JH/17 Fix inbound CHUNKING when DKIM disabled at runtime.
 183
 184 HS/01 Fix portability problems introduced by PP/08 for platforms where
 185       realloc(NULL) is not equivalent to malloc() [SunOS et al].
 186
 187 HS/02 Bug 1974: Fix missing line terminator on the last received BDAT
 188       chunk. This allows us to accept broken chunked messages. We need a more
 189       general solution here.
 190
 191 PP/09 Wrote util/chunking_fixqueue_finalnewlines.pl to help recover
 192       already-broken messages in the queue.
 193
 194 JH/18 Bug 2061: Fix ${extract } corrupting an enclosing ${reduce }  $value.
 195
 196 JH/19 Fix reference counting bug in routing-generated-address tracking.
 197
 198
 199 Exim version 4.88
 200 -----------------
 201
 202 JH/01 Use SIZE on MAIL FROM in a cutthrough connection, if the destination
 203       supports it and a size is available (ie. the sending peer gave us one).
 204
 205 JH/02 The obsolete acl condition "demime" is removed (finally, after ten
 206       years of being deprecated). The replacements are the ACLs
 207       acl_smtp_mime and acl_not_smtp_mime.
 208
 209 JH/03 Upgrade security requirements imposed for hosts_try_dane: previously
 210       a downgraded non-dane trust-anchor for the TLS connection (CA-style)
 211       or even an in-clear connection were permitted.  Now, if the host lookup
 212       was dnssec and dane was requested then the host is only used if the
 213       TLSA lookup succeeds and is dnssec.  Further hosts (eg. lower priority
 214       MXs) will be tried (for hosts_try_dane though not for hosts_require_dane)
 215       if one fails this test.
 216       This means that a poorly-configured remote DNS will make it incommunicado;
 217       but it protects against a DNS-interception attack on it.
 218
 219 JH/04 Bug 1810: make continued-use of an open smtp transport connection
 220       non-noisy when a race steals the message being considered.
 221
 222 JH/05 If main configuration option tls_certificate is unset, generate a
 223       self-signed certificate for inbound TLS connections.
 224
 225 JH/06 Bug 165: hide more cases of password exposure - this time in expansions
 226       in rewrites and routers.
 227
 228 JH/07 Retire gnutls_require_mac et.al.  These were nonfunctional since 4.80
 229       and logged a warning sing 4.83; now they are a configuration file error.
 230
 231 JH/08 Bug 1836: Fix crash in VRFY handling when handed an unqualified name
 232       (lacking @domain).  Apply the same qualification processing as RCPT.
 233
 234 JH/09 Bug 1804: Avoid writing msglog files when in -bh or -bhc mode.
 235
 236 JH/10 Support ${sha256:} applied to a string (as well as the previous
 237       certificate).
 238
 239 JH/11 Cutthrough: avoid using the callout hints db on a verify callout when
 240       a cutthrough deliver is pending, as we always want to make a connection.
 241       This also avoids re-routing the message when later placing the cutthrough
 242       connection after a verify cache hit.
 243       Do not update it with the verify result either.
 244
 245 JH/12 Cutthrough: disable when verify option success_on_redirect is used, and
 246       when routing results in more than one destination address.
 247
 248 JH/13 Cutthrough: expand transport dkim_domain option when testing for dkim
 249       signing (which inhibits the cutthrough capability).  Previously only
 250       the presence of an option was tested; now an expansion evaluating as
 251       empty is permissible (obviously it should depend only on data available
 252       when the cutthrough connection is made).
 253
 254 JH/14 Fix logging of errors under PIPELINING.  Previously the log line giving
 255       the relevant preceding SMTP command did not note the pipelining mode.
 256
 257 JH/15 Fix counting of empty lines in $body_linecount and $message_linecount.
 258       Previously they were not counted.
 259
 260 JH/16 DANE: treat a TLSA lookup response having all non-TLSA RRs, the same
 261       as one having no matching records.  Previously we deferred the message
 262       that needed the lookup.
 263
 264 JH/17 Fakereject: previously logged as a normal message arrival "<="; now
 265       distinguished as "(=".
 266
 267 JH/18 Bug 1867: make the fail_defer_domains option on a dnslookup router work
 268       for missing MX records.  Previously it only worked for missing A records.
 269
 270 JH/19 Bug 1850: support Radius libraries that return REJECT_RC.
 271
 272 JH/20 Bug 1872: Ensure that acl_smtp_notquit is run when the connection drops
 273       after the data-go-ahead and data-ack.  Patch from Jason Betts.
 274
 275 JH/21 Bug 1846: Send DMARC forensic reports for reject and quarantine results,
 276       even for a "none" policy.  Patch from Tony Meyer.
 277
 278 JH/22 Fix continued use of a connection for further deliveries. If a port was
 279       specified by a router, it must also match for the delivery to be
 280       compatible.
 281
 282 JH/23 Bug 1874: fix continued use of a connection for further deliveries.
 283       When one of the recipients of a message was unsuitable for the connection
 284       (has no matching addresses), we lost track of needing to mark it
 285       deferred.  As a result mail would be lost.
 286
 287 JH/24 Bug 1832: Log EHLO response on getting conn-close response for HELO.
 288
 289 JH/25 Decoding ACL controls is now done using a binary search; the source code
 290       takes up less space and should be simpler to maintain.  Merge the ACL
 291       condition decode tables also, with similar effect.
 292
 293 JH/26 Fix problem with one_time used on a redirect router which returned the
 294       parent address unchanged.  A retry would see the parent address marked as
 295       delivered, so not attempt the (identical) child.  As a result mail would
 296       be lost.
 297
 298 JH/27 Fix a possible security hole, wherein a process operating with the Exim
 299       UID can gain a root shell.  Credit to http://www.halfdog.net/ for
 300       discovery and writeup.  Ubuntu bug 1580454; no bug raised against Exim
 301       itself :(
 302
 303 JH/28 Enable {spool,log} filesystem space and inode checks as default.
 304       Main config options check_{log,spool}_{inodes,space} are now
 305       100 inodes, 10MB unless set otherwise in the configuration.
 306
 307 JH/29 Fix the connection_reject log selector to apply to the connect ACL.
 308       Previously it only applied to the main-section connection policy
 309       options.
 310
 311 JH/30 Bug 1897: fix callouts connection fallback from TLS to cleartext.
 312
 313 PP/01 Changed default Diffie-Hellman parameters to be Exim-specific, created
 314       by me.  Added RFC7919 DH primes as an alternative.
 315
 316 PP/02 Unbreak build via pkg-config with new hash support when crypto headers
 317       are not in the system include path.
 318
 319 JH/31 Fix longstanding bug with aborted TLS server connection handling.  Under
 320       GnuTLS, when a session startup failed (eg because the client disconnected)
 321       Exim did stdio operations after fclose.  This was exposed by a recent
 322       change which nulled out the file handle after the fclose.
 323
 324 JH/32 Bug 1909: Fix OCSP proof verification for cases where the proof is
 325       signed directly by the cert-signing cert, rather than an intermediate
 326       OCSP-signing cert.  This is the model used by LetsEncrypt.
 327
 328 JH/33 Bug 1914: Ensure socket is nonblocking before draining after SMTP QUIT.
 329
 330 HS/01 Fix leak in verify callout under GnuTLS, about 3MB per recipient on
 331       an incoming connection.
 332
 333 HS/02 Bug 1802: Do not half-close the connection after sending a request
 334       to rspamd.
 335
 336 HS/03 Use "auto" as the default EC curve parameter. For OpenSSL < 1.0.2
 337       fallback to "prime256v1".
 338
 339 JH/34 SECURITY: Use proper copy of DATA command in error message.
 340       Could leak key material.  Remotely exploitable.  CVE-2016-9963.
 341
 342
 343 Exim version 4.87
 344 -----------------
 345
 346 JH/01 Bug 1664: Disable OCSP for GnuTLS library versions at/before 3.3.16
 347       and 3.4.4 - once the server is enabled to respond to an OCSP request
 348       it does even when not requested, resulting in a stapling non-aware
 349       client dropping the TLS connection.
 350
 351 TF/01 Code cleanup: Overhaul the debug_selector and log_selector machinery to
 352       support variable-length bit vectors. No functional change.
 353
 354 TF/02 Improve the consistency of logging incoming and outgoing interfaces.
 355       The I= interface field on outgoing lines is now after the H= remote
 356       host field, same as incoming lines. There is a separate
 357       outgoing_interface log selector which allows you to disable the
 358       outgoing I= field.
 359
 360 JH/02 Bug 728: Close logfiles after a daemon-process "exceptional" log write.
 361       If not running log_selector +smtp_connection the mainlog would be held
 362       open indefinitely after a "too many connections" event, including to a
 363       deleted file after a log rotate. Leave the per net connection logging
 364       leaving it open for efficiency as that will be quickly detected by the
 365       check on the next write.
 366
 367 HS/01 Bug 1671: Fix post transport crash.
 368       Processing the wait-<transport> messages could crash the delivery
 369       process if the message IDs didn't exist for some reason. When
 370       using 'split_spool_directory=yes' the construction of the spool
 371       file name failed already, exposing the same netto behaviour.
 372
 373 JH/03 Bug 425: Capture substrings in $regex1, $regex2 etc from regex &
 374       mime_regex ACL conditions.
 375
 376 JH/04 Bug 1686: When compiled with EXPERIMENTAL_DSN_INFO: Add extra information
 377       to DSN fail messages (bounces): remote IP, remote greeting, remote response
 378       to HELO, local diagnostic string.
 379
 380 JH/05 Downgrade message for a TLS-certificate-based authentication fail from
 381       log line to debug.  Even when configured with a tls authenticator many
 382       client connections are expected to not authenticate in this way, so
 383       an authenticate fail is not an error.
 384
 385 HS/02 Add the Exim version string to the process info.  This way exiwhat
 386       gives some more detail about the running daemon.
 387
 388 JH/06 Bug 1395: time-limit caching of DNS lookups, to the TTL value.  This may
 389       matter for fast-change records such as DNSBLs.
 390
 391 JH/07 Bug 1678: Always record an interface option value, if set,  as part of a
 392       retry record, even if constant.  There may be multiple transports with
 393       different interface settings and the retry behaviour needs to be kept
 394       distinct.
 395
 396 JH/08 Bug 1586: exiqgrep now refuses to run if there are unexpected arguments.
 397
 398 JH/09 Bug 1700: ignore space & tab embedded in base64 during decode.
 399
 400 JH/10 Bug 840: fix log_defer_output option of pipe transport
 401
 402 JH/11 Bug 830: use same host for all RCPTS of a message, even under
 403       hosts_randomize.  This matters a lot when combined with mua_wrapper.
 404
 405 JH/12 Bug 1706: percent and underbar characters are no longer escaped by the
 406       ${quote_pgsql:<string>} operator.
 407
 408 JH/13 Bug 1708: avoid misaligned access in cached lookup.
 409
 410 JH/14 Change header file name for freeradius-client.  Relevant if compiling
 411       with Radius support; from the Gentoo tree and checked under Fedora.
 412
 413 JH/15 Bug 1712: Introduce $prdr_requested flag variable
 414
 415 JH/16 Bug 1714: Permit an empty string as expansion result for transport
 416       option transport_filter, meaning no filtering.
 417
 418 JH/17 Bug 1713: Fix non-PDKIM_DEBUG build.  Patch from Jasen Betts.
 419
 420 JH/18 Bug 1709: When built with TLS support, the tls_advertise_hosts option now
 421       defaults to "*" (all hosts).  The variable is now available when not built
 422       with TLS, default unset, mainly to enable keeping the testsuite sane.
 423       If a server certificate is not supplied (via tls_certificate) an error is
 424       logged, and clients will find TLS connections fail on startup.  Presumably
 425       they will retry in-clear.
 426       Packagers of Exim are strongly encouraged to create a server certificate
 427       at installation time.
 428
 429 HS/03 Add -bP config_file as a synonym for -bP configure_file, for consistency
 430       with the $config_file variable.
 431
 432 JH/19 Two additional event types: msg:rcpt:defer and msg:rcpt:host:defer. Both
 433       in transport context, after the attempt, and per-recipient. The latter type
 434       is per host attempted.  The event data is the error message, and the errno
 435       information encodes the lookup type (A vs. MX) used for the (first) host,
 436       and the trailing two digits of the smtp 4xx response.
 437
 438 GF/01 Bug 1715: Fix for race condition in exicyclog, where exim could attempt
 439       to write to mainlog (or rejectlog, paniclog) in the window between file
 440       creation and permissions/ownership being changed. Particularly affects
 441       installations where exicyclog is run as root, rather than exim user;
 442       result is that the running daemon panics and dies.
 443
 444 JH/20 Bug 1701: For MySQL lookups, support MySQL config file option group names.
 445
 446 JH/21 Bug 1720: Add support for priority groups and weighted-random proxy
 447       selection for the EXPERIMENTAL_SOCKS feature, via new per-proxy options
 448       "pri" and "weight".  Note that the previous implicit priority given by the
 449       list order is no longer honoured.
 450
 451 JH/22 Bugs 963, 1721: Fix some corner cases in message body canonicalization
 452       for DKIM processing.
 453
 454 JH/23 Move SOCKS5 support from Experimental to mainline, enabled for a build
 455       by defining SUPPORT_SOCKS.
 456
 457 JH/26 Move PROXY support from Experimental to mainline, enabled for a build
 458       by defining SUPPORT_PROXY.  Note that the proxy_required_hosts option
 459       is renamed to hosts_proxy, and the proxy_{host,target}_{address,port}.
 460       variables are renamed to proxy_{local,external}_{address,port}.
 461
 462 JH/27 Move Internationalisation support from Experimental to mainline, enabled
 463       for a build by defining SUPPORT_I18N
 464
 465 JH/28 Bug 1745: Fix redis lookups to handle (quoted) spaces embedded in parts
 466       of the query string, and make ${quote_redis:} do that quoting.
 467
 468 JH/29 Move Events support from Experimental to mainline, enabled by default
 469       and removable for a build by defining DISABLE_EVENT.
 470
 471 JH/30 Updated DANE implementation code to current from Viktor Dukhovni.
 472
 473 JH/31 Fix bug with hosts_connection_nolog and named-lists which were wrongly
 474       cached by the daemon.
 475
 476 JH/32 Move Redis support from Experimental to mainline, enabled for a build
 477       by defining LOOKUP_REDIS. The libhiredis library is required.
 478
 479 JH/33 Bug 1748: Permit ACL dnslists= condition in non-smtp ACLs if explicit
 480       keys are given for lookup.
 481
 482 JH/34 Bug 1192: replace the embedded copy of PolarSSL RSA routines in the DKIM
 483       support, by using OpenSSL or GnuTLS library ones.  This means DKIM is
 484       only supported when built with TLS support.  The PolarSSL SHA routines
 485       are still used when the TLS library is too old for convenient support.
 486
 487 JH/35 Require SINGLE_DH_USE by default in OpenSSL (main config option
 488       openssl_options), for security.  OpenSSL forces this from version 1.1.0
 489       server-side so match that on older versions.
 490
 491 JH/36 Bug 1778: longstanding bug in memory use by the ${run } expansion: A fresh
 492       allocation for $value could be released as the expansion processing
 493       concluded, but leaving the global pointer active for it.
 494
 495 JH/37 Bug 1769: Permit a VRFY ACL to override the default 252 response,
 496       and to use the domains and local_parts ACL conditions.
 497
 498 JH/38 Fix cutthrough bug with body lines having a single dot. The dot was
 499       incorrectly not doubled on cutthrough transmission, hence seen as a
 500       body-termination at the receiving system - resulting in truncated mails.
 501       Commonly the sender saw a TCP-level error, and retransmitted the message
 502       via the normal store-and-forward channel. This could result in duplicates
 503       received - but deduplicating mailstores were liable to retain only the
 504       initial truncated version.
 505
 506 JH/39 Bug 1781: Fix use of DKIM private-keys having trailing '=' in the base-64.
 507
 508 JH/40 Fix crash in queryprogram router when compiled with EXPERIMENTAL_SRS.
 509
 510 JH/41 Bug 1792: Fix selection of headers to sign for DKIM: bottom-up.  While
 511       we're in there, support oversigning also; bug 1309.
 512
 513 JH/42 Bug 1796: Fix error logged on a malware scanner connection failure.
 514
 515 HS/04 Add support for keep_environment and add_environment options.
 516
 517 JH/43 Tidy coding issues detected by gcc --fsanitize=undefined.  Some remain;
 518       either intentional arithmetic overflow during PRNG, or testing config-
 519       induced overflows.
 520
 521 JH/44 Bug 1800: The combination of a -bhc commandline option and cutthrough
 522       delivery resulted in actual delivery.  Cancel cutthrough before DATA
 523       stage.
 524
 525 JH/45 Fix cutthrough, when connection not opened by verify and target hard-
 526       rejects a recipient: pass the reject to the originator.
 527
 528 JH/46 Multiple issues raised by Coverity. Some were obvious or plausible bugs.
 529       Many were false-positives and ignorable, but it's worth fixing the
 530       former class.
 531
 532 JH/47 Fix build on HP-UX and older Solaris, which need (un)setenv now also
 533       for the new environment-manipulation done at startup.  Move the routines
 534       from being local to tls.c to being global via the os.c file.
 535
 536 JH/48 Bug 1807: Fix ${extract } for the numeric/3-string case. While preparsing
 537       an extract embedded as result-arg for a map, the first arg for extract
 538       is unavailable so we cannot tell if this is a numbered or keyed
 539       extraction.  Accept either.
 540
 541
 542 Exim version 4.86
 543 -----------------
 544
 545 JH/01 Bug 1545: The smtp transport option "retry_include_ip_address" is now
 546       expanded.
 547
 548 JH/02 The smtp transport option "multi_domain" is now expanded.
 549
 550 JH/03 The smtp transport now requests PRDR by default, if the server offers
 551       it.
 552
 553 JH/04 Certificate name checking on server certificates, when exim is a client,
 554       is now done by default.  The transport option tls_verify_cert_hostnames
 555       can be used to disable this per-host.  The build option
 556       EXPERIMENTAL_CERTNAMES is withdrawn.
 557
 558 JH/05 The value of the tls_verify_certificates smtp transport and main options
 559       default to the word "system" to access the system default CA bundle.
 560       For GnuTLS, only version 3.0.20 or later.
 561
 562 JH/06 Verification of the server certificate for a TLS connection is now tried
 563       (but not required) by default.  The verification status is now logged by
 564       default, for both outbound TLS and client-certificate supplying inbound
 565       TLS connections
 566
 567 JH/07 Changed the default rfc1413 lookup settings to disable calls.  Few
 568       sites use this now.
 569
 570 JH/08 The EXPERIMENTAL_DSN compile option is no longer needed; all Delivery
 571       Status Notification (bounce) messages are now MIME format per RFC 3464.
 572       Support for RFC 3461 DSN options NOTIFY,ENVID,RET,ORCPT can be advertised
 573       under the control of the dsn_advertise_hosts option, and routers may
 574       have a dsn_lasthop option.
 575
 576 JH/09 A timeout of 2 minutes is now applied to all malware scanner types by
 577       default, modifiable by a malware= option.  The list separator for
 578       the options can now be changed in the usual way.  Bug 68.
 579
 580 JH/10 The smtp_receive_timeout main option is now expanded before use.
 581
 582 JH/11 The incoming_interface log option now also enables logging of the
 583       local interface on delivery outgoing connections.
 584
 585 JH/12 The cutthrough-routing facility now supports multi-recipient mails,
 586       if the interface and destination host and port all match.
 587
 588 JH/13 Bug 344: The verify = reverse_host_lookup ACL condition now accepts a
 589       /defer_ok option.
 590
 591 JH/14 Bug 1573: The spam= ACL condition now additionally supports Rspamd.
 592       Patch from Andrew Lewis.
 593
 594 JH/15 Bug 670: The spamd_address main option (for the spam= ACL condition)
 595       now supports optional time-restrictions, weighting, and priority
 596       modifiers per server.  Patch originally by <rommer@active.by>.
 597
 598 JH/16 The spamd_address main option now supports a mixed list of local
 599       and remote servers.  Remote servers can be IPv6 addresses, and
 600       specify a port-range.
 601
 602 JH/17 Bug 68: The spamd_address main option now supports an optional
 603       timeout value per server.
 604
 605 JH/18 Bug 1581: Router and transport options headers_add/remove can
 606       now have the list separator specified.
 607
 608 JH/19 Bug 392: spamd_address, and clamd av_scanner, now support retry
 609       option values.
 610
 611 JH/20 Bug 1571: Ensure that $tls_in_peerdn is set, when verification fails
 612       under OpenSSL.
 613
 614 JH/21 Support for the A6 type of dns record is withdrawn.
 615
 616 JH/22 Bug 608: The result of a QUIT or not-QUIT toplevel ACL now matters
 617       rather than the verbs used.
 618
 619 JH/23 Bug 1572: Increase limit on SMTP confirmation message copy size
 620       from 255 to 1024 chars.
 621
 622 JH/24 Verification callouts now attempt to use TLS by default.
 623
 624 HS/01 DNSSEC options (dnssec_require_domains, dnssec_request_domains)
 625       are generic router options now. The defaults didn't change.
 626
 627 JH/25 Bug 466: Add RFC2322 support for MIME attachment filenames.
 628       Original patch from Alexander Shikoff, worked over by JH.
 629
 630 HS/02 Bug 1575: exigrep falls back to autodetection of compressed
 631       files if ZCAT_COMMAND is not executable.
 632
 633 JH/26 Bug 1539: Add timeout/retry options on dnsdb lookups.
 634
 635 JH/27 Bug 286: Support SOA lookup in dnsdb lookups.
 636
 637 JH/28 Bug 1588: Do not use the A lookup following an AAAA for setting the FQDN.
 638       Normally benign, it bites when the pair was led to by a CNAME;
 639       modern usage is to not canonicalize the domain to a CNAME target
 640       (and we were inconsistent anyway for A-only vs AAAA+A).
 641
 642 JH/29 Bug 1632: Removed the word "rejected" from line logged for ACL discards.
 643
 644 JH/30 Check the forward DNS lookup for DNSSEC, in addition to the reverse,
 645       when evaluating $sender_host_dnssec.
 646
 647 JH/31 Check the HELO verification lookup for DNSSEC, adding new
 648       $sender_helo_dnssec variable.
 649
 650 JH/32 Bug 1397: Enable ECDHE on OpenSSL, just the NIST P-256 curve.
 651
 652 JH/33 Bug 1346: Note MAIL cmd seen in -bS batch, to avoid smtp_no_mail log.
 653
 654 JH/34 Bug 1648: Fix a memory leak seen with "mailq" and large queues.
 655
 656 JH/35 Bug 1642: Fix support of $spam_ variables at delivery time.  Was
 657       documented as working, but never had.  Support all but $spam_report.
 658
 659 JH/36 Bug 1659: Guard checking of input smtp commands again pseudo-command
 660       added for tls authenticator.
 661
 662 HS/03 Add perl_taintmode main config option
 663
 664
 665 Exim version 4.85
 666 -----------------
 667
 668 TL/01 When running the test suite, the README says that variables such as
 669       no_msglog_check are global and can be placed anywhere in a specific
 670       test's script, however it was observed that placement needed to be near
 671       the beginning for it to behave that way. Changed the runtest perl
 672       script to read through the entire script once to detect and set these
 673       variables, reset to the beginning of the script, and then run through
 674       the script parsing/test process like normal.
 675
 676 TL/02 The BSD's have an arc4random API. One of the functions to induce
 677       adding randomness was arc4random_stir(), but it has been removed in
 678       OpenBSD 5.5. Detect this OpenBSD version and skip calling this
 679       function when detected.
 680
 681 JH/01 Expand the EXPERIMENTAL_TPDA feature.  Several different events now
 682       cause callback expansion.
 683
 684 TL/03 Bugzilla 1518: Clarify "condition" processing in routers; that
 685       syntax errors in an expansion can be treated as a string instead of
 686       logging or causing an error, due to the internal use of bool_lax
 687       instead of bool when processing it.
 688
 689 JH/02 Add EXPERIMENTAL_DANE, allowing for using the DNS as trust-anchor for
 690       server certificates when making smtp deliveries.
 691
 692 JH/03 Support secondary-separator specifier for MX, SRV, TLSA lookups.
 693
 694 JH/04 Add ${sort {list}{condition}{extractor}} expansion item.
 695
 696 TL/04 Bugzilla 1216: Add -M (related messages) option to exigrep.
 697
 698 TL/05 GitHub Issue 18: Adjust logic testing for true/false in redis lookups.
 699       Merged patch from Sebastian Wiedenroth.
 700
 701 JH/05 Fix results-pipe from transport process.  Several recipients, combined
 702       with certificate use, exposed issues where response data items split
 703       over buffer boundaries were not parsed properly.  This eventually
 704       resulted in duplicates being sent.  This issue only became common enough
 705       to notice due to the introduction of connection certificate information,
 706       the item size being so much larger.  Found and fixed by Wolfgang Breyha.
 707
 708 JH/06 Bug 1533: Fix truncation of items in headers_remove lists.  A fixed
 709       size buffer was used, resulting in syntax errors when an expansion
 710       exceeded it.
 711
 712 JH/07 Add support for directories of certificates when compiled with a GnuTLS
 713       version 3.3.6 or later.
 714
 715 JH/08 Rename the TPDA experimental facility to Event Actions.  The #ifdef
 716       is EXPERIMENTAL_EVENT, the main-configuration and transport options
 717       both become "event_action", the variables become $event_name, $event_data
 718       and $event_defer_errno.  There is a new variable $verify_mode, usable in
 719       routers, transports and related events.  The tls:cert event is now also
 720       raised for inbound connections, if the main configuration event_action
 721       option is defined.
 722
 723 TL/06 In test suite, disable OCSP for old versions of openssl which contained
 724       early OCSP support, but no stapling (appears to be less than 1.0.0).
 725
 726 JH/09 When compiled with OpenSSL and EXPERIMENTAL_CERTNAMES, the checks on
 727       server certificate names available under the smtp transport option
 728       "tls_verify_cert_hostname" now do not permit multi-component wildcard
 729       matches.
 730
 731 JH/10 Time-related extraction expansions from certificates now use the main
 732       option "timezone" setting for output formatting, and are consistent
 733       between OpenSSL and GnuTLS compilations.  Bug 1541.
 734
 735 JH/11 Fix a crash in mime ACL when meeting a zero-length, quoted or RFC2047-
 736       encoded parameter in the incoming message.  Bug 1558.
 737
 738 JH/12 Bug 1527: Autogrow buffer used in reading spool files.  Since they now
 739       include certificate info, eximon was claiming there were spoolfile
 740       syntax errors.
 741
 742 JH/13 Bug 1521: Fix ldap lookup for single-attr request, multiple-attr return.
 743
 744 JH/14 Log delivery-related information more consistently, using the sequence
 745       "H=<name> [<ip>]" wherever possible.
 746
 747 TL/07 Bug 1547: Omit RFCs from release. Draft and RFCs have licenses which
 748       are problematic for Debian distribution, omit them from the release
 749       tarball.
 750
 751 JH/15 Updates and fixes to the EXPERIMENTAL_DSN feature.
 752
 753 JH/16 Fix string representation of time values on 64bit time_t architectures.
 754       Bug 1561.
 755
 756 JH/17 Fix a null-indirection in certextract expansions when a nondefault
 757       output list separator was used.
 758
 759
 760 Exim version 4.84
 761 -----------------
 762 TL/01 Bugzilla 1506: Re-add a 'return NULL' to silence complaints from static
 763       checkers that were complaining about end of non-void function with no
 764       return.
 765
 766 JH/01 Bug 1513: Fix parsing of quoted parameter values in MIME headers.
 767       This was a regression introduced in 4.83 by another bugfix.
 768
 769 JH/02 Fix broken compilation when EXPERIMENTAL_DSN is enabled.
 770
 771 TL/02 Bug 1509: Fix exipick for enhanced spoolfile specification used when
 772       EXPERIMENTAL_DSN is enabled.  Fix from Wolfgang Breyha.
 773
 774
 775 Exim version 4.83
 776 -----------------
 777
 778 TF/01 Correctly close the server side of TLS when forking for delivery.
 779
 780       When a message was received over SMTP with TLS, Exim failed to clear up
 781       the incoming connection properly after forking off the child process to
 782       deliver the message. In some situations the subsequent outgoing
 783       delivery connection happened to have the same fd number as the incoming
 784       connection previously had. Exim would try to use TLS and fail, logging
 785       a "Bad file descriptor" error.
 786
 787 TF/02 Portability fix for building lookup modules on Solaris when the xpg4
 788       utilities have not been installed.
 789
 790 JH/01 Fix memory-handling in use of acl as a conditional; avoid free of
 791       temporary space as the ACL may create new global variables.
 792
 793 TL/01 LDAP support uses per connection or global context settings, depending
 794       upon the detected version of the libraries at build time.
 795
 796 TL/02 Experimental Proxy Protocol support: allows a proxied SMTP connection
 797       to extract and use the src ip:port in logging and expansions as if it
 798       were a direct connection from the outside internet. PPv2 support was
 799       updated based on HAProxy spec change in May 2014.
 800
 801 JH/02 Add ${listextract {number}{list}{success}{fail}}.
 802
 803 TL/03 Bugzilla 1433: Fix DMARC SEGV with specific From header contents.
 804       Properly escape header and check for NULL return.
 805
 806 PP/01 Continue incomplete 4.82 PP/19 by fixing docs too: use dns_dnssec_ok
 807       not dns_use_dnssec.
 808
 809 JH/03 Bugzilla 1157: support log_selector smtp_confirmation for lmtp.
 810
 811 TL/04 Add verify = header_names_ascii check to reject email with non-ASCII
 812       characters in header names, implemented as a verify condition.
 813       Contributed by Michael Fischer v. Mollard.
 814
 815 TL/05 Rename SPF condition results err_perm and err_temp to standardized
 816       results permerror and temperror.  Previous values are deprecated but
 817       still accepted.  In a future release, err_perm and err_temp will be
 818       completely removed, which will be a backward incompatibility if the
 819       ACL tests for either of these two old results. Patch contributed by
 820       user bes-internal on the mailing list.
 821
 822 JH/04 Add ${utf8clean:} operator. Contributed by Alex Rau.
 823
 824 JH/05 Bugzilla 305: Log incoming-TLS details on rejects, subject to log
 825       selectors, in both main and reject logs.
 826
 827 JH/06 Log outbound-TLS and port details, subject to log selectors, for a
 828       failed delivery.
 829
 830 JH/07 Add malware type "sock" for talking to simple daemon.
 831
 832 JH/08 Bugzilla 1371: Add tls_{,try_}verify_hosts to smtp transport.
 833
 834 JH/09 Bugzilla 1431: Support (with limitations) headers_add/headers_remove in
 835       routers/transports under cutthrough routing.
 836
 837 JH/10 Bugzilla 1005: ACL "condition =" should accept values which are negative
 838       numbers.  Touch up "bool" conditional to keep the same definition.
 839
 840 TL/06 Remove duplicated language in spec file from 4.82 TL/16.
 841
 842 JH/11 Add dnsdb tlsa lookup.  From Todd Lyons.
 843
 844 JH/12 Expand items in router/transport headers_add or headers_remove lists
 845       individually rather than the list as a whole.  Bug 1452.
 846
 847       Required for reasonable handling of multiple headers_ options when
 848       they may be empty; requires that headers_remove items with embedded
 849       colons must have them doubled (or the list-separator changed).
 850
 851 TL/07 Add new dmarc expansion variable $dmarc_domain_policy to directly
 852       view the policy declared in the DMARC record. Currently, $dmarc_status
 853       is a combined value of both the record presence and the result of the
 854       analysis.
 855
 856 JH/13 Fix handling of $tls_cipher et.al. in (non-verify) transport.  Bug 1455.
 857
 858 JH/14 New options dnssec_request_domains, dnssec_require_domains on the
 859       dnslookup router and the smtp transport (applying to the forward
 860       lookup).
 861
 862 TL/08 Bugzilla 1453: New LDAP "SERVERS=" option allows admin to override list
 863       of ldap servers used for a specific lookup.  Patch provided by Heiko
 864       Schlichting.
 865
 866 JH/18 New options dnssec_lax, dnssec_strict on dnsdb lookups.
 867       New variable $lookup_dnssec_authenticated for observability.
 868
 869 TL/09 Bugzilla 609: Add -C option to exiqgrep, specify which exim.conf to use.
 870       Patch submitted by Lars Timman.
 871
 872 JH/19 EXPERIMENTAL_OCSP support under GnuTLS.  Bug 1459.
 873
 874 TL/10 Bugzilla 1454: New -oMm option to pass message reference to Exim.
 875       Requires trusted mode and valid format message id, aborts otherwise.
 876       Patch contributed by Heiko Schlichting.
 877
 878 JH/20 New expansion variables tls_(in,out)_(our,peer)cert, and expansion item
 879       certextract with support for various fields.  Bug 1358.
 880
 881 JH/21 Observability of OCSP via variables tls_(in,out)_ocsp.  Stapling
 882       is requested by default, modifiable by smtp transport option
 883       hosts_request_ocsp.
 884
 885 JH/22 Expansion operators ${md5:string} and ${sha1:string} can now
 886       operate on certificate variables to give certificate fingerprints
 887       Also new ${sha256:cert_variable}.
 888
 889 JH/23 The PRDR feature is moved from being Experimental into the mainline.
 890
 891 TL/11 Bug 1119: fix memory allocation in string_printing2().  Patch from
 892       Christian Aistleitner.
 893
 894 JH/24 The OCSP stapling feature is moved from Experimental into the mainline.
 895
 896 TL/12 Bug 1444: Fix improper \r\n sequence handling when writing spool
 897       file.  Patch from Wolfgang Breyha.
 898
 899 JH/25 Expand the coverage of the delivery $host and $host_address to
 900       client authenticators run in verify callout.  Bug 1476.
 901
 902 JH/26 Port service names are now accepted for tls_on_connect_ports, to
 903       align with daemon_smtp_ports.  Bug 72.
 904
 905 TF/03 Fix udpsend. The ip_connectedsocket() function's socket type
 906       support and error reporting did not work properly.
 907
 908 TL/13 Bug 1495: Exiqgrep check if -C config file specified on cli exists
 909       and is readable.  Patch from Andrew Colin Kissa.
 910
 911 TL/14 Enhance documentation of ${run expansion and how it parses the
 912       commandline after expansion, particularly in the case when an
 913       unquoted variable expansion results in an empty value.
 914
 915 JH/27 The TLS SNI feature was broken in 4.82.  Fix it.
 916
 917 PP/02 Fix internal collision of T_APL on systems which support RFC3123
 918       by renaming away from it.  Addresses GH issue 15, reported by
 919       Jasper Wallace.
 920
 921 JH/28 Fix parsing of MIME headers for parameters with quoted semicolons.
 922
 923 TL/15 SECURITY: prevent double expansion in math comparison functions
 924       (can expand unsanitized data). Not remotely exploitable.
 925       CVE-2014-2972
 926
 927
 928 Exim version 4.82
 929 -----------------
 930
 931 PP/01 Add -bI: framework, and -bI:sieve for querying sieve capabilities.
 932
 933 PP/02 Make -n do something, by making it not do something.
 934       When combined with -bP, the name of an option is not output.
 935
 936 PP/03 Added tls_dh_min_bits SMTP transport driver option, only honoured
 937       by GnuTLS.
 938
 939 PP/04 First step towards DNSSEC, provide $sender_host_dnssec for
 940       $sender_host_name and config options to manage this, and basic check
 941       routines.
 942
 943 PP/05 DSCP support for outbound connections and control modifier for inbound.
 944
 945 PP/06 Cyrus SASL: set local and remote IP;port properties for driver.
 946       (Only plugin which currently uses this is kerberos4, which nobody should
 947       be using, but we should make it available and other future plugins might
 948       conceivably use it, even though it would break NAT; stuff *should* be
 949       using channel bindings instead).
 950
 951 PP/07 Handle "exim -L <tag>" to indicate to use syslog with tag as the process
 952       name; added for Sendmail compatibility; requires admin caller.
 953       Handle -G as equivalent to "control = suppress_local_fixups" (we used to
 954       just ignore it); requires trusted caller.
 955       Also parse but ignore: -Ac -Am -X<logfile>
 956       Bugzilla 1117.
 957
 958 TL/01 Bugzilla 1258 - Refactor MAIL FROM optional args processing.
 959
 960 TL/02 Add +smtp_confirmation as a default logging option.
 961
 962 TL/03 Bugzilla 198 - Implement remove_header ACL modifier.
 963       Patch by Magnus Holmgren from 2007-02-20.
 964
 965 TL/04 Bugzilla 1281 - Spec typo.
 966       Bugzilla 1283 - Spec typo.
 967       Bugzilla 1290 - Spec grammar fixes.
 968
 969 TL/05 Bugzilla 1285 - Spec omission, fix docbook errors for spec.txt creation.
 970
 971 TL/06 Add Experimental DMARC support using libopendmarc libraries.
 972
 973 TL/07 Fix an out of order global option causing a segfault.  Reported to dev
 974       mailing list by by Dmitry Isaikin.
 975
 976 JH/01 Bugzilla 1201 & 304 - New cutthrough-delivery feature, with TLS support.
 977
 978 JH/02 Support "G" suffix to numbers in ${if comparisons.
 979
 980 PP/08 Handle smtp transport tls_sni option forced-fail for OpenSSL.
 981
 982 NM/01 Bugzilla 1197 - Spec typo
 983       Bugzilla 1196 - Spec examples corrections
 984
 985 JH/03 Add expansion operators ${listnamed:name} and ${listcount:string}
 986
 987 PP/09 Add gnutls_allow_auto_pkcs11 option (was originally called
 988       gnutls_enable_pkcs11, but renamed to more accurately indicate its
 989       function.
 990
 991 PP/10 Let Linux makefile inherit CFLAGS/CFLAGS_DYNAMIC.
 992       Pulled from Debian 30_dontoverridecflags.dpatch by Andreas Metzler.
 993
 994 JH/04 Add expansion item ${acl {name}{arg}...}, expansion condition
 995       "acl {{name}{arg}...}", and optional args on acl condition
 996       "acl = name arg..."
 997
 998 JH/05 Permit multiple router/transport headers_add/remove lines.
 999
1000 JH/06 Add dnsdb pseudo-lookup "a+" to do an "aaaa" + "a" combination.
1001
1002 JH/07 Avoid using a waiting database for a single-message-only transport.
1003       Performance patch from Paul Fisher.  Bugzilla 1262.
1004
1005 JH/08 Strip leading/trailing newlines from add_header ACL modifier data.
1006       Bugzilla 884.
1007
1008 JH/09 Add $headers_added variable, with content from use of ACL modifier
1009       add_header (but not yet added to the message).  Bugzilla 199.
1010
1011 JH/10 Add 8bitmime log_selector, for 8bitmime status on the received line.
1012       Pulled from Bugzilla 817 by Wolfgang Breyha.
1013
1014 PP/11 SECURITY: protect DKIM DNS decoding from remote exploit.
1015       CVE-2012-5671
1016       (nb: this is the same fix as in Exim 4.80.1)
1017
1018 JH/11 Add A= logging on delivery lines, and a client_set_id option on
1019       authenticators.
1020
1021 JH/12 Add optional authenticated_sender logging to A= and a log_selector
1022       for control.
1023
1024 PP/12 Unbreak server_set_id for NTLM/SPA auth, broken by 4.80 PP/29.
1025
1026 PP/13 Dovecot auth: log better reason to rejectlog if Dovecot did not
1027       advertise SMTP AUTH mechanism to us, instead of a generic
1028       protocol violation error.  Also, make Exim more robust to bad
1029       data from the Dovecot auth socket.
1030
1031 TF/01 Fix ultimate retry timeouts for intermittently deliverable recipients.
1032
1033       When a queue runner is handling a message, Exim first routes the
1034       recipient addresses, during which it prunes them based on the retry
1035       hints database. After that it attempts to deliver the message to
1036       any remaining recipients. It then updates the hints database using
1037       the retry rules.
1038
1039       So if a recipient address works intermittently, it can get repeatedly
1040       deferred at routing time. The retry hints record remains fresh so the
1041       address never reaches the final cutoff time.
1042
1043       This is a fairly common occurrence when a user is bumping up against
1044       their storage quota. Exim had some logic in its local delivery code
1045       to deal with this. However it did not apply to per-recipient defers
1046       in remote deliveries, e.g. over LMTP to a separate IMAP message store.
1047
1048       This change adds a proper retry rule check during routing so that the
1049       final cutoff time is checked against the message's age. We only do
1050       this check if there is an address retry record and there is not a
1051       domain retry record; this implies that previous attempts to handle
1052       the address had the retry_use_local_parts option turned on. We use
1053       this as an approximation for the destination being like a local
1054       delivery, as in LMTP.
1055
1056       I suspect this new check makes the old local delivery cutoff check
1057       redundant, but I have not verified this so I left the code in place.
1058
1059 TF/02 Correct gecos expansion when From: is a prefix of the username.
1060
1061       Test 0254 submits a message to Exim with the header
1062
1063         Resent-From: f
1064
1065       When I ran the test suite under the user fanf2, Exim expanded
1066       the header to contain my full name, whereas it should have added
1067       a Resent-Sender: header. It erroneously treats any prefix of the
1068       username as equal to the username.
1069
1070       This change corrects that bug.
1071
1072 GF/01 DCC debug and logging tidyup
1073       Error conditions log to paniclog rather than rejectlog.
1074       Debug lines prefixed by "DCC: " to remove any ambiguity.
1075
1076 TF/03 Avoid unnecessary rebuilds of lookup-related code.
1077
1078 PP/14 Fix OCSP reinitialisation in SNI handling for Exim/TLS as server.
1079       Bug spotted by Jeremy Harris; was flawed since initial commit.
1080       Would have resulted in OCSP responses post-SNI triggering an Exim
1081       NULL dereference and crash.
1082
1083 JH/13 Add $router_name and $transport_name variables.  Bugzilla 308.
1084
1085 PP/15 Define SIOCGIFCONF_GIVES_ADDR for GNU Hurd.
1086       Bug detection, analysis and fix by Samuel Thibault.
1087       Bugzilla 1331, Debian bug #698092.
1088
1089 SC/01 Update eximstats to watch out for senders sending 'HELO [IpAddr]'
1090
1091 JH/14 SMTP PRDR (http://www.eric-a-hall.com/specs/draft-hall-prdr-00.txt).
1092       Server implementation by Todd Lyons, client by JH.
1093       Only enabled when compiled with EXPERIMENTAL_PRDR.  A new
1094       config variable "prdr_enable" controls whether the server
1095       advertises the facility.  If the client requests PRDR a new
1096       acl_data_smtp_prdr ACL is called once for each recipient, after
1097       the body content is received and before the acl_smtp_data ACL.
1098       The client is controlled by both of: a hosts_try_prdr option
1099       on the smtp transport, and the server advertisement.
1100       Default client logging of deliveries and rejections involving
1101       PRDR are flagged with the string "PRDR".
1102
1103 PP/16 Fix problems caused by timeouts during quit ACLs trying to double
1104       fclose().  Diagnosis by Todd Lyons.
1105
1106 PP/17 Update configure.default to handle IPv6 localhost better.
1107       Patch by Alain Williams (plus minor tweaks).
1108       Bugzilla 880.
1109
1110 PP/18 OpenSSL made graceful with empty tls_verify_certificates setting.
1111       This is now consistent with GnuTLS, and is now documented: the
1112       previous undocumented portable approach to treating the option as
1113       unset was to force an expansion failure.  That still works, and
1114       an empty string is now equivalent.
1115
1116 PP/19 Renamed DNSSEC-enabling option to "dns_dnssec_ok", to make it
1117       clearer that Exim is using the DO (DNSSEC OK) EDNS0 resolver flag,
1118       not performing validation itself.
1119
1120 PP/20 Added force_command boolean option to pipe transport.
1121       Patch from Nick Koston, of cPanel Inc.
1122
1123 JH/15 AUTH support on callouts (and hence cutthrough-deliveries).
1124       Bugzilla 321, 823.
1125
1126 TF/04 Added udpsend ACL modifier and hexquote expansion operator
1127
1128 PP/21 Fix eximon continuous updating with timestamped log-files.
1129       Broken in a format-string cleanup in 4.80, missed when I repaired the
1130       other false fix of the same issue.
1131       Report and fix from Heiko Schlichting.
1132       Bugzilla 1363.
1133
1134 PP/22 Guard LDAP TLS usage against Solaris LDAP variant.
1135       Report from Prashanth Katuri.
1136
1137 PP/23 Support safari_ecdhe_ecdsa_bug for openssl_options.
1138       It's SecureTransport, so affects any MacOS clients which use the
1139       system-integrated TLS libraries, including email clients.
1140
1141 PP/24 Fix segfault from trying to fprintf() to a NULL stdio FILE* if
1142       using a MIME ACL for non-SMTP local injection.
1143       Report and assistance in diagnosis by Warren Baker.
1144
1145 TL/08 Adjust exiqgrep to be case-insensitive for sender/receiver.
1146
1147 JH/16 Fix comparisons for 64b.  Bugzilla 1385.
1148
1149 TL/09 Add expansion variable $authenticated_fail_id to keep track of
1150       last id that failed so it may be referenced in subsequent ACL's.
1151
1152 TL/10 Bugzilla 1375 - Prevent TLS rebinding in ldap. Patch provided by
1153       Alexander Miroch.
1154
1155 TL/11 Bugzilla 1382 - Option ldap_require_cert overrides start_tls
1156       ldap library initialization, allowing self-signed CA's to be
1157       used. Also properly sets require_cert option later in code by
1158       using NULL (global ldap config) instead of ldap handle (per
1159       session). Bug diagnosis and testing by alxgomz.
1160
1161 TL/12 Enhanced documentation in the ratelimit.pl script provided in
1162       the src/util/ subdirectory.
1163
1164 TL/13 Bug 1031 - Imported transport SQL logging patch from Axel Rau
1165       renamed to Transport Post Delivery Action by Jeremy Harris, as
1166       EXPERIMENTAL_TPDA.
1167
1168 TL/14 Bugzilla 1217 - Redis lookup support has been added. It is only enabled
1169       when Exim is compiled with EXPERIMENTAL_REDIS. A new config variable
1170       redis_servers = needs to be configured which will be used by the redis
1171       lookup.  Patch from Warren Baker, of The Packet Hub.
1172
1173 TL/15 Fix exiqsumm summary for corner case. Patch provided by Richard Hall.
1174
1175 TL/16 Bugzilla 1289 - Clarify host/ip processing when have errors looking up a
1176       hostname or reverse DNS when processing a host list. Used suggestions
1177       from multiple comments on this bug.
1178
1179 TL/17 Bugzilla 1057 - Multiple clamd TCP targets patch from Mark Zealey.
1180
1181 TL/18 Had previously added a -CONTINUE option to runtest in the test suite.
1182       Missed a few lines, added it to make the runtest require no keyboard
1183       interaction.
1184
1185 TL/19 Bugzilla 1402 - Test 533 fails if any part of the path to the test suite
1186       contains upper case chars. Make router use caseful_local_part.
1187
1188 TL/20 Bugzilla 1400 - Add AVOID_GNUTLS_PKCS11 build option. Allows GnuTLS
1189       support when GnuTLS has been built with p11-kit.
1190
1191
1192 Exim version 4.80.1
1193 -------------------
1194
1195 PP/01 SECURITY: protect DKIM DNS decoding from remote exploit.
1196       CVE-2012-5671
1197       This, or similar/improved, will also be change PP/11 of 4.82.
1198
1199
1200 Exim version 4.80
1201 -----------------
1202
1203 PP/01 Handle short writes when writing local log-files.
1204       In practice, only affects FreeBSD (8 onwards).
1205       Bugzilla 1053, with thanks to Dmitry Isaikin.
1206
1207 NM/01 Bugzilla 949 - Documentation tweak
1208
1209 NM/02 Bugzilla 1093 - eximstats DATA reject detection regexps
1210       improved.
1211
1212 NM/03 Bugzilla 1169 - primary_hostname spelling was incorrect in docs.
1213
1214 PP/02 Implemented gsasl authenticator.
1215
1216 PP/03 Implemented heimdal_gssapi authenticator with "server_keytab" option.
1217
1218 PP/04 Local/Makefile support for (AUTH|LOOKUP)_*_PC=foo to use
1219       `pkg-config foo` for cflags/libs.
1220
1221 PP/05 Swapped $auth1/$auth2 for gsasl GSSAPI mechanism, to be more consistent
1222       with rest of GSASL and with heimdal_gssapi.
1223
1224 PP/06 Local/Makefile support for USE_(GNUTLS|OPENSSL)_PC=foo to use
1225       `pkg-config foo` for cflags/libs for the TLS implementation.
1226
1227 PP/07 New expansion variable $tls_bits; Cyrus SASL server connection
1228       properties get this fed in as external SSF.  A number of robustness
1229       and debugging improvements to the cyrus_sasl authenticator.
1230
1231 PP/08 cyrus_sasl server now expands the server_realm option.
1232
1233 PP/09 Bugzilla 1214 - Log authentication information in reject log.
1234       Patch by Jeremy Harris.
1235
1236 PP/10 Added dbmjz lookup type.
1237
1238 PP/11 Let heimdal_gssapi authenticator take a SASL message without an authzid.
1239
1240 PP/12 MAIL args handles TAB as well as SP, for better interop with
1241       non-compliant senders.
1242       Analysis and variant patch by Todd Lyons.
1243
1244 NM/04 Bugzilla 1237 - fix cases where printf format usage not indicated
1245       Bug report from Lars Müller <lars@samba.org> (via SUSE),
1246       Patch from Dirk Mueller <dmueller@suse.com>
1247
1248 PP/13 tls_peerdn now print-escaped for spool files.
1249       Observed some $tls_peerdn in wild which contained \n, which resulted
1250       in spool file corruption.
1251
1252 PP/14 TLS fixes for OpenSSL: support TLS 1.1 & 1.2; new "openssl_options"
1253       values; set SSL_MODE_AUTO_RETRY so that OpenSSL will retry a read
1254       or write after TLS renegotiation, which otherwise led to messages
1255       "Got SSL error 2".
1256
1257 TK/01 Bugzilla 1239 - fix DKIM verification when signature was not inserted
1258       as a tracking header (ie: a signed header comes before the signature).
1259       Patch from Wolfgang Breyha.
1260
1261 JH/01 Bugzilla 660 - Multi-valued attributes from ldap now parseable as a
1262       comma-sep list; embedded commas doubled.
1263
1264 JH/02 Refactored ACL "verify =" logic to table-driven dispatch.
1265
1266 PP/15 LDAP: Check for errors of TLS initialisation, to give correct
1267       diagnostics.
1268       Report and patch from Dmitry Banschikov.
1269
1270 PP/16 Removed "dont_insert_empty_fragments" from "openssl_options".
1271       Removed SSL_clear() after SSL_new() which led to protocol negotiation
1272       failures.  We appear to now support TLS1.1+ with Exim.
1273
1274 PP/17 OpenSSL: new expansion var $tls_sni, which if used in tls_certificate
1275       lets Exim select keys and certificates based upon TLS SNI from client.
1276       Also option tls_sni on SMTP Transports.  Also clear $tls_bits correctly
1277       before an outbound SMTP session.  New log_selector, +tls_sni.
1278
1279 PP/18 Bugzilla 1122 - check localhost_number expansion for failure, avoid
1280       NULL dereference.  Report and patch from Alun Jones.
1281
1282 PP/19 DNS resolver init changes for NetBSD compatibility.  (Risk of breakage
1283       on less well tested platforms).  Obviates NetBSD pkgsrc patch-ac.
1284       Not seeing resolver debug output on NetBSD, but suspect this is a
1285       resolver implementation change.
1286
1287 PP/20 Revert part of NM/04, it broke log_path containing %D expansions.
1288       Left warnings.  Added "eximon gdb" invocation mode.
1289
1290 PP/21 Defaulting "accept_8bitmime" to true, not false.
1291
1292 PP/22 Added -bw for inetd wait mode support.
1293
1294 PP/23 Added PCRE_CONFIG=yes support to Makefile for using pcre-config to
1295       locate the relevant includes and libraries.  Made this the default.
1296
1297 PP/24 Fixed headers_only on smtp transports (was not sending trailing dot).
1298       Bugzilla 1246, report and most of solution from Tomasz Kusy.
1299
1300 JH/03 ${eval } now uses 64-bit and supports a "g" suffix (like to "k" and "m").
1301       This may cause build issues on older platforms.
1302
1303 PP/25 Revamped GnuTLS support, passing tls_require_ciphers to
1304       gnutls_priority_init, ignoring Exim options gnutls_require_kx,
1305       gnutls_require_mac & gnutls_require_protocols (no longer supported).
1306       Added SNI support via GnuTLS too.
1307       Made ${randint:..} supplier available, if using not-too-old GnuTLS.
1308
1309 PP/26 Added EXPERIMENTAL_OCSP for OpenSSL.
1310
1311 PP/27 Applied dnsdb SPF support patch from Janne Snabb.
1312       Applied second patch from Janne, implementing suggestion to default
1313       multiple-strings-in-record handling to match SPF spec.
1314
1315 JH/04 Added expansion variable $tod_epoch_l for a higher-precision time.
1316
1317 PP/28 Fix DCC dcc_header content corruption (stack memory referenced,
1318       read-only, out of scope).
1319       Patch from Wolfgang Breyha, report from Stuart Northfield.
1320
1321 PP/29 Fix three issues highlighted by clang analyser static analysis.
1322       Only crash-plausible issue would require the Cambridge-specific
1323       iplookup router and a misconfiguration.
1324       Report from Marcin Mirosław.
1325
1326 PP/30 Another attempt to deal with PCRE_PRERELEASE, this one less buggy.
1327
1328 PP/31 %D in printf continues to cause issues (-Wformat=security), so for
1329       now guard some of the printf checks behind WANT_DEEPER_PRINTF_CHECKS.
1330       As part of this, removing so much warning spew let me fix some minor
1331       real issues in debug logging.
1332
1333 PP/32 GnuTLS was always using default tls_require_ciphers, due to a missing
1334       assignment on my part.  Fixed.
1335
1336 PP/33 Added tls_dh_max_bits option, defaulting to current hard-coded limit
1337       of NSS, for GnuTLS/NSS interop.  Problem root cause diagnosis by
1338       Janne Snabb (who went above and beyond: thank you).
1339
1340 PP/34 Validate tls_require_ciphers on startup, since debugging an invalid
1341       string otherwise requires a connection and a bunch more work and it's
1342       relatively easy to get wrong.  Should also expose TLS library linkage
1343       problems.
1344
1345 PP/35 Pull in <features.h> on Linux, for some portability edge-cases of
1346       64-bit ${eval} (JH/03).
1347
1348 PP/36 Define _GNU_SOURCE in exim.h; it's needed for some releases of
1349       GNU libc to support some of the 64-bit stuff, should not lead to
1350       conflicts.  Defined before os.h is pulled in, so if a given platform
1351       needs to override this, it can.
1352
1353 PP/37 Unbreak Cyrus SASL auth: SSF retrieval was incorrect, Exim thought
1354       protection layer was required, which is not implemented.
1355       Bugzilla 1254, patch from Wolfgang Breyha.
1356
1357 PP/38 Overhaul DH prime handling, supply RFC-specified DH primes as built
1358       into Exim, default to IKE id 23 from RFC 5114 (2048 bit).  Make
1359       tls_dhparam take prime identifiers.  Also unbreak combination of
1360       OpenSSL+DH_params+TLSSNI.
1361
1362 PP/39 Disable SSLv2 by default in OpenSSL support.
1363
1364
1365 Exim version 4.77
1366 -----------------
1367
1368 PP/01 Solaris build fix for Oracle's LDAP libraries.
1369       Bugzilla 1109, patch from Stephen Usher.
1370
1371 TF/01 HP/UX build fix: avoid arithmetic on a void pointer.
1372
1373 TK/01 DKIM Verification: Fix relaxed canon for empty headers w/o
1374       whitespace trailer
1375
1376 TF/02 Fix a couple more cases where we did not log the error message
1377       when unlink() failed. See also change 4.74-TF/03.
1378
1379 TF/03 Make the exiwhat support code safe for signals. Previously Exim might
1380       lock up or crash if it happened to be inside a call to libc when it
1381       got a SIGUSR1 from exiwhat.
1382
1383       The SIGUSR1 handler appends the current process status to the process
1384       log which is later printed by exiwhat. It used to use the general
1385       purpose logging code to do this, but several functions it calls are
1386       not safe for signals.
1387
1388       The new output code in the SIGUSR1 handler is specific to the process
1389       log, and simple enough that it's easy to inspect for signal safety.
1390       Removing some special cases also simplifies the general logging code.
1391       Removing the spurious timestamps from the process log simplifies
1392       exiwhat.
1393
1394 TF/04 Improved ratelimit ACL condition.
1395
1396       The /noupdate option has been deprecated in favour of /readonly which
1397       has clearer semantics. The /leaky, /strict, and /readonly update modes
1398       are mutually exclusive. The update mode is no longer included in the
1399       database key; it just determines when the database is updated. (This
1400       means that when you upgrade Exim will forget old rate measurements.)
1401
1402       Exim now checks that the per_* options are used with an update mode that
1403       makes sense for the current ACL. For example, when Exim is processing a
1404       message (e.g. acl_smtp_rcpt or acl_smtp_data, etc.) you can specify
1405       per_mail/leaky or per_mail/strict; otherwise (e.g. in acl_smtp_helo) you
1406       must specify per_mail/readonly. If you omit the update mode it defaults to
1407       /leaky where that makes sense (as before) or /readonly where required.
1408
1409       The /noupdate option is now undocumented but still supported for
1410       backwards compatibility. It is equivalent to /readonly except that in
1411       ACLs where /readonly is required you may specify /leaky/noupdate or
1412       /strict/noupdate which are treated the same as /readonly.
1413
1414       A useful new feature is the /count= option. This is a generalization
1415       of the per_byte option, so that you can measure the throughput of other
1416       aggregate values. For example, the per_byte option is now equivalent
1417       to per_mail/count=${if >{0}{$message_size} {0} {$message_size} }.
1418
1419       The per_rcpt option has been generalized using the /count= mechanism
1420       (though it's more complicated than the per_byte equivalence). When it is
1421       used in acl_smtp_rcpt, the per_rcpt option adds recipients to the
1422       measured rate one at a time; if it is used later (e.g. in acl_smtp_data)
1423       or in a non-SMTP ACL it adds all the recipients in one go. (The latter
1424       /count=$recipients_count behaviour used to work only in non-SMTP ACLs.)
1425       Note that using per_rcpt with a non-readonly update mode in more than
1426       one ACL will cause the recipients to be double-counted. (The per_mail
1427       and per_byte options don't have this problem.)
1428
1429       The handling of very low rates has changed slightly. If the computed rate
1430       is less than the event's count (usually one) then this event is the first
1431       after a long gap. In this case the rate is set to the same as this event's
1432       count, so that the first message of a spam run is counted properly.
1433
1434       The major new feature is a mechanism for counting the rate of unique
1435       events. The new per_addr option counts the number of different
1436       recipients that someone has sent messages to in the last time period. It
1437       behaves like per_rcpt if all the recipient addresses are different, but
1438       duplicate recipient addresses do not increase the measured rate. Like
1439       the /count= option this is a general mechanism, so the per_addr option
1440       is equivalent to per_rcpt/unique=$local_part@$domain. You can, for
1441       example, measure the rate that a client uses different sender addresses
1442       with the options per_mail/unique=$sender_address. There are further
1443       details in the main documentation.
1444
1445 TF/05 Removed obsolete $Cambridge$ CVS revision strings.
1446
1447 TF/06 Removed a few PCRE remnants.
1448
1449 TF/07 Automatically extract Exim's version number from tags in the git
1450       repository when doing development or release builds.
1451
1452 PP/02 Raise smtp_cmd_buffer_size to 16kB.
1453       Bugzilla 879.  Patch from Paul Fisher.
1454
1455 PP/03 Implement SSL-on-connect outbound with protocol=smtps on smtp transport.
1456       Heavily based on revision 40f9a89a from Simon Arlott's tree.
1457       Bugzilla 97.
1458
1459 PP/04 Use .dylib instead of .so for dynamic library loading on MacOS.
1460
1461 PP/05 Variable $av_failed, true if the AV scanner deferred.
1462       Bugzilla 1078.  Patch from John Horne.
1463
1464 PP/06 Stop make process more reliably on build failure.
1465       Bugzilla 1087.  Patch from Heiko Schlittermann.
1466
1467 PP/07 Make maildir_use_size_file an _expandable_ boolean.
1468       Bugzilla 1089.  Patch from Heiko Schlittermann.
1469
1470 PP/08 Handle ${run} returning more data than OS pipe buffer size.
1471       Bugzilla 1131.  Patch from Holger Weiß.
1472
1473 PP/09 Handle IPv6 addresses with SPF.
1474       Bugzilla 860.  Patch from Wolfgang Breyha.
1475
1476 PP/10 GnuTLS: support TLS 1.2 & 1.1.
1477       Bugzilla 1156.
1478       Use gnutls_certificate_verify_peers2() [patch from Andreas Metzler].
1479       Bugzilla 1095.
1480
1481 PP/11 match_* no longer expand right-hand-side by default.
1482       New compile-time build option, EXPAND_LISTMATCH_RHS.
1483       New expansion conditions, "inlist", "inlisti".
1484
1485 PP/12 fix uninitialised greeting string from PP/03 (smtps client support).
1486
1487 PP/13 shell and compiler warnings fixes for RC1-RC4 changes.
1488
1489 PP/14 fix log_write() format string regression from TF/03.
1490       Bugzilla 1152.  Patch from Dmitry Isaikin.
1491
1492
1493 Exim version 4.76
1494 -----------------
1495
1496 PP/01 The new ldap_require_cert option would segfault if used.  Fixed.
1497
1498 PP/02 Harmonised TLS library version reporting; only show if debugging.
1499       Layout now matches that introduced for other libraries in 4.74 PP/03.
1500
1501 PP/03 New openssl_options items: no_sslv2 no_sslv3 no_ticket no_tlsv1
1502
1503 PP/04 New "dns_use_edns0" global option.
1504
1505 PP/05 Don't segfault on misconfiguration of ref:name exim-user as uid.
1506       Bugzilla 1098.
1507
1508 PP/06 Extra paranoia around buffer usage at the STARTTLS transition.
1509       nb: Exim is not vulnerable to http://www.kb.cert.org/vuls/id/555316
1510
1511 TK/01 Updated PolarSSL code to 0.14.2.
1512       Bugzilla 1097. Patch from Andreas Metzler.
1513
1514 PP/07 Catch divide-by-zero in ${eval:...}.
1515       Fixes bugzilla 1102.
1516
1517 PP/08 Condition negation of bool{}/bool_lax{} did not negate.  Fixed.
1518       Bugzilla 1104.
1519
1520 TK/02 Bugzilla 1106: CVE-2011-1764 - DKIM log line was subject to a
1521       format-string attack -- SECURITY: remote arbitrary code execution.
1522
1523 TK/03 SECURITY - DKIM signature header parsing was double-expanded, second
1524       time unintentionally subject to list matching rules, letting the header
1525       cause arbitrary Exim lookups (of items which can occur in lists, *not*
1526       arbitrary string expansion). This allowed for information disclosure.
1527
1528 PP/09 Fix another SIGFPE (x86) in ${eval:...} expansion, this time related to
1529       INT_MIN/-1 -- value coerced to INT_MAX.
1530
1531
1532 Exim version 4.75
1533 -----------------
1534
1535 NM/01 Workaround for PCRE version dependency in version reporting
1536       Bugzilla 1073
1537
1538 TF/01 Update valgrind.h and memcheck.h to copies from valgrind-3.6.0.
1539       This fixes portability to compilers other than gcc, notably
1540       Solaris CC and HP-UX CC. Fixes Bugzilla 1050.
1541
1542 TF/02 Bugzilla 139: Avoid using the += operator in the modular lookup
1543       makefiles for portability to HP-UX and POSIX correctness.
1544
1545 PP/01 Permit LOOKUP_foo enabling on the make command-line.
1546       Also via indented variable definition in the Makefile.
1547       (Debugging by Oliver Heesakkers).
1548
1549 PP/02 Restore caching of spamd results with expanded spamd_address.
1550       Patch from author of expandable spamd_address patch, Wolfgang Breyha.
1551
1552 PP/03 Build issue: lookups-Makefile now exports LC_ALL=C
1553       Improves build reliability.  Fix from: Frank Elsner
1554
1555 NM/02 Fix wide character breakage in the rfc2047 coding
1556       Fixes bug 1064. Patch from Andrey N. Oktyabrski
1557
1558 NM/03 Allow underscore in dnslist lookups
1559       Fixes bug 1026. Patch from Graeme Fowler
1560
1561 PP/04 Bugzilla 230: Support TLS-enabled LDAP (in addition to ldaps).
1562       Code patches from Adam Ciarcinski of NetBSD.
1563
1564 NM/04 Fixed exiqgrep to cope with mailq missing size issue
1565       Fixes bug 943.
1566
1567 PP/05 Bugzilla 1083: when lookup expansion defers, escape the output which
1568       is logged, to avoid truncation. Patch from John Horne.
1569
1570 PP/06 Bugzilla 1042: implement freeze_signal on pipe transports.
1571       Patch from Jakob Hirsch.
1572
1573 PP/07 Bugzilla 1061: restrict error messages sent over SMTP to not reveal
1574       SQL string expansion failure details.
1575       Patch from Andrey Oktyabrski.
1576
1577 PP/08 Bugzilla 486: implement %M datestamping in log filenames.
1578       Patch from Simon Arlott.
1579
1580 PP/09 New lookups functionality failed to compile on old gcc which rejects
1581       extern declarations in function scope.
1582       Patch from Oliver Fleischmann
1583
1584 PP/10 Use sig_atomic_t for flags set from signal handlers.
1585       Check getgroups() return and improve debugging.
1586       Fixed developed for diagnosis in bug 927 (which turned out to be
1587       a kernel bug).
1588
1589 PP/11 Bugzilla 1055: Update $message_linecount for maildir_tag.
1590       Patch from Mark Zealey.
1591
1592 PP/12 Bugzilla 1056: Improved spamd server selection.
1593       Patch from Mark Zealey.
1594
1595 PP/13 Bugzilla 1086: Deal with maildir quota file races.
1596       Based on patch from Heiko Schlittermann.
1597
1598 PP/14 Bugzilla 1019: DKIM multiple signature generation fix.
1599       Patch from Uwe Doering, sign-off by Michael Haardt.
1600
1601 NM/05 Fix to spam.c to accommodate older gcc versions which dislike
1602       variable declaration deep within a block.  Bug and patch from
1603       Dennis Davis.
1604
1605 PP/15 lookups-Makefile IRIX compatibility coercion.
1606
1607 PP/16 Make DISABLE_DKIM build knob functional.
1608
1609 NM/06 Bugzilla 968: child_open_uid: restore default SIGPIPE handler
1610       Patch by Simon Arlott
1611
1612 TF/03 Fix valgrind.h portability to C89 compilers that do not support
1613       variable argument macros. Our copy now differs from upstream.
1614
1615
1616 Exim version 4.74
1617 -----------------
1618
1619 TF/01 Failure to get a lock on a hints database can have serious
1620       consequences so log it to the panic log.
1621
1622 TF/02 Log LMTP confirmation messages in the same way as SMTP,
1623       controlled using the smtp_confirmation log selector.
1624
1625 TF/03 Include the error message when we fail to unlink a spool file.
1626
1627 DW/01 Bugzilla 139: Support dynamically loaded lookups as modules.
1628       With thanks to Steve Haslam, Johannes Berg & Serge Demonchaux
1629       for maintaining out-of-tree patches for some time.
1630
1631 PP/01 Bugzilla 139: Documentation and portability issues.
1632       Avoid GNU Makefile-isms, let Exim continue to build on BSD.
1633       Handle per-OS dynamic-module compilation flags.
1634
1635 PP/02 Let /dev/null have normal permissions.
1636       The 4.73 fixes were a little too stringent and complained about the
1637       permissions on /dev/null.  Exempt it from some checks.
1638       Reported by Andreas M. Kirchwitz.
1639
1640 PP/03 Report version information for many libraries, including
1641       Exim version information for dynamically loaded libraries.  Created
1642       version.h, now support a version extension string for distributors
1643       who patch heavily. Dynamic module ABI change.
1644
1645 PP/04 CVE-2011-0017 - check return value of setuid/setgid. This is a
1646       privilege escalation vulnerability whereby the Exim run-time user
1647       can cause root to append content of the attacker's choosing to
1648       arbitrary files.
1649
1650 PP/05 Bugzilla 1041: merged DCC maintainer's fixes for return code.
1651       (Wolfgang Breyha)
1652
1653 PP/06 Bugzilla 1071: fix delivery logging with untrusted macros.
1654       If dropping privileges for untrusted macros, we disabled normal logging
1655       on the basis that it would fail; for the Exim run-time user, this is not
1656       the case, and it resulted in successful deliveries going unlogged.
1657       Fixed.  Reported by Andreas Metzler.
1658
1659
1660 Exim version 4.73
1661 -----------------
1662
1663 PP/01 Date: & Message-Id: revert to normally being appended to a message,
1664       only prepend for the Resent-* case.  Fixes regression introduced in
1665       Exim 4.70 by NM/22 for Bugzilla 607.
1666
1667 PP/02 Include check_rfc2047_length in configure.default because we're seeing
1668       increasing numbers of administrators be bitten by this.
1669
1670 JJ/01 Added DISABLE_DKIM and comment to src/EDITME
1671
1672 PP/03 Bugzilla 994: added openssl_options main configuration option.
1673
1674 PP/04 Bugzilla 995: provide better SSL diagnostics on failed reads.
1675
1676 PP/05 Bugzilla 834: provide a permit_coredump option for pipe transports.
1677
1678 PP/06 Adjust NTLM authentication to handle SASL Initial Response.
1679
1680 PP/07 If TLS negotiated an anonymous cipher, we could end up with SSL but
1681       without a peer certificate, leading to a segfault because of an
1682       assumption that peers always have certificates.  Be a little more
1683       paranoid.  Problem reported by Martin Tscholak.
1684
1685 PP/08 Bugzilla 926: switch ClamAV to use the new zINSTREAM API for content
1686       filtering; old API available if built with WITH_OLD_CLAMAV_STREAM=yes
1687       NB: ClamAV planning to remove STREAM in "middle of 2010".
1688       CL also introduces -bmalware, various -d+acl logging additions and
1689       more caution in buffer sizes.
1690
1691 PP/09 Implemented reverse_ip expansion operator.
1692
1693 PP/10 Bugzilla 937: provide a "debug" ACL control.
1694
1695 PP/11 Bugzilla 922: Documentation dusting, patch provided by John Horne.
1696
1697 PP/12 Bugzilla 973: Implement --version.
1698
1699 PP/13 Bugzilla 752: Refuse to build/run if Exim user is root/0.
1700
1701 PP/14 Build without WITH_CONTENT_SCAN. Path from Andreas Metzler.
1702
1703 PP/15 Bugzilla 816: support multiple condition rules on Routers.
1704
1705 PP/16 Add bool_lax{} expansion operator and use that for combining multiple
1706       condition rules, instead of bool{}.  Make both bool{} and bool_lax{}
1707       ignore trailing whitespace.
1708
1709 JJ/02 prevent non-panic DKIM error from being sent to paniclog
1710
1711 JJ/03 added tcp_wrappers_daemon_name to allow host entries other than
1712       "exim" to be used
1713
1714 PP/17 Fix malware regression for cmdline scanner introduced in PP/08.
1715       Notification from Dr Andrew Aitchison.
1716
1717 PP/18 Change ClamAV response parsing to be more robust and to handle ClamAV's
1718       ExtendedDetectionInfo response format.
1719       Notification from John Horne.
1720
1721 PP/19 OpenSSL 1.0.0a compatibility const-ness change, should be backwards
1722       compatible.
1723
1724 PP/20 Added a CONTRIBUTING file.  Fixed the documentation build to use http:
1725       XSL and documented dependency on system catalogs, with examples of how
1726       it normally works.
1727
1728 DW/21 Added Valgrind hooks in store.c to help it capture out-of-bounds store
1729       access.
1730
1731 DW/22 Bugzilla 1044: CVE-2010-4345 - partial fix: restrict default behaviour
1732       of CONFIGURE_OWNER and CONFIGURE_GROUP options to no longer allow a
1733       configuration file which is writeable by the Exim user or group.
1734
1735 DW/23 Bugzilla 1044: CVE-2010-4345 - part two: extend checks for writeability
1736       of configuration files to cover files specified with the -C option if
1737       they are going to be used with root privileges, not just the default
1738       configuration file.
1739
1740 DW/24 Bugzilla 1044: CVE-2010-4345 - part three: remove ALT_CONFIG_ROOT_ONLY
1741       option (effectively making it always true).
1742
1743 DW/25 Add TRUSTED_CONFIG_PREFIX_FILE option to allow alternative configuration
1744       files to be used while preserving root privileges.
1745
1746 DW/26 Set FD_CLOEXEC on SMTP sockets after forking in the daemon, to ensure
1747       that rogue child processes cannot use them.
1748
1749 PP/27 Bugzilla 1047: change the default for system_filter_user to be the Exim
1750       run-time user, instead of root.
1751
1752 PP/28 Add WHITELIST_D_MACROS option to let some macros be overridden by the
1753       Exim run-time user without dropping privileges.
1754
1755 DW/29 Remove use of va_copy() which breaks pre-C99 systems. Duplicate the
1756       result string, instead of calling string_vformat() twice with the same
1757       arguments.
1758
1759 DW/30 Allow TRUSTED_CONFIG_PREFIX_FILE only for Exim or CONFIGURE_OWNER, not
1760       for other users. Others should always drop root privileges if they use
1761       -C on the command line, even for a whitelisted configure file.
1762
1763 DW/31 Turn TRUSTED_CONFIG_PREFIX_FILE into TRUSTED_CONFIG_FILE. No prefixes.
1764
1765 NM/01 Fixed bug #1002 - Message loss when using multiple deliveries
1766
1767
1768 Exim version 4.72
1769 -----------------
1770
1771 JJ/01 installed exipick 20100104.1, adding $max_received_linelength,
1772       $data_path, and $header_path variables; fixed documentation bugs and
1773       typos
1774
1775 JJ/02 installed exipick 20100222.0, added --input-dir and --finput to allow
1776       exipick to access non-standard spools, including the "frozen" queue
1777       (Finput)
1778
1779 NM/01 Bugzilla 965: Support mysql stored procedures.
1780       Patch from Alain Williams
1781
1782 NM/02 Bugzilla 961: Spacing fix (syntax error) on Makefile directives for NetBSD
1783
1784 NM/03 Bugzilla 955: Documentation fix for max_rcpts.
1785       Patch from Andreas Metzler
1786
1787 NM/04 Bugzilla 954: Fix for unknown responses from Dovecot authenticator.
1788       Patch from Kirill Miazine
1789
1790 NM/05 Bugzilla 671: Added umask to procmail example.
1791
1792 JJ/03 installed exipick 20100323.0, fixing doc bug
1793
1794 NM/06 Bugzilla 988: CVE-2010-2023 - prevent hardlink attack on sticky mail
1795       directory.  Notification and patch from Dan Rosenberg.
1796
1797 TK/01 PDKIM: Upgrade PolarSSL files to upstream version 0.12.1.
1798
1799 TK/02 Improve log output when DKIM signing operation fails.
1800
1801 MH/01 Treat the transport option dkim_domain as a colon separated
1802       list, not as a single string, and sign the message with each element,
1803       omitting multiple occurences of the same signer.
1804
1805 NM/07 Null terminate DKIM strings, Null initialise DKIM variable
1806       Bugzilla 985, 986.  Patch by Simon Arlott
1807
1808 NM/08 Bugzilla 967. dnsdb DNS TXT record bug fix (DKIM-related)
1809       Patch by Simon Arlott
1810
1811 PP/01 Bugzilla 989: CVE-2010-2024 - work round race condition on
1812       MBX locking.  Notification from Dan Rosenberg.
1813
1814
1815 Exim version 4.71
1816 -----------------
1817
1818 TK/01 Bugzilla 912: Fix DKIM segfault on empty headers/body.
1819
1820 NM/01 Bugzilla 913: Documentation fix for gnutls_* options.
1821
1822 NM/02 Bugzilla 722: Documentation for randint.  Better randomness defaults.
1823
1824 NM/03 Bugzilla 847: Enable DNSDB lookup by default.
1825
1826 NM/04 Bugzilla 915: Flag broken perl installation during build.
1827
1828
1829 Exim version 4.70
1830 -----------------
1831
1832 TK/01 Added patch by Johannes Berg that expands the main option
1833       "spamd_address" if it starts with a dollar sign.
1834
1835 TK/02 Write list of recipients to X-Envelope-Sender header when building
1836       the mbox-format spool file for content scanning (suggested by Jakob
1837       Hirsch).
1838
1839 TK/03 Added patch by Wolfgang Breyha that adds experimental DCC
1840       (http://www.dcc-servers.net/) support via dccifd. Activated by
1841       setting EXPERIMENTAL_DCC=yes in Local/Makefile.
1842
1843 TK/04 Bugzilla 673: Add f-protd malware scanner support. Patch submitted
1844       by Mark Daniel Reidel <mr@df.eu>.
1845
1846 NM/01 Bugzilla 657: Embedded PCRE removed from the exim source tree.
1847       When building exim an external PCRE library is now needed -
1848       PCRE is a system library on the majority of modern systems.
1849       See entry on PCRE_LIBS in EDITME file.
1850
1851 NM/02 Bugzilla 646: Removed unwanted C/R in Dovecot authenticator
1852       conversation.  Added nologin parameter to request.
1853       Patch contributed by Kirill Miazine.
1854
1855 TF/01 Do not log submission mode rewrites if they do not change the address.
1856
1857 TF/02 Bugzilla 662: Fix stack corruption before exec() in daemon.c.
1858
1859 NM/03 Bugzilla 602: exicyclog now handles panic log, and creates empty
1860       log files in place.  Contributed by Roberto Lima.
1861
1862 NM/04 Bugzilla 667: Close socket used by dovecot authenticator.
1863
1864 TF/03 Bugzilla 615: When checking the local_parts router precondition
1865       after a local_part_suffix or local_part_prefix option, Exim now
1866       does not use the address's named list lookup cache, since this
1867       contains cached lookups for the whole local part.
1868
1869 NM/05 Bugzilla 521: Integrated SPF Best Guess support contributed by
1870       Robert Millan.  Documentation is in experimental-spec.txt.
1871
1872 TF/04 Bugzilla 668: Fix parallel build (make -j).
1873
1874 NM/05.2 Bugzilla 437: Prevent Maildir aux files being created with mode 000.
1875
1876 NM/05.3 Bugzilla 598: Improvement to Dovecot authenticator handling.
1877       Patch provided by Jan Srzednicki.
1878
1879 TF/05 Leading white space used to be stripped from $spam_report which
1880       wrecked the formatting. Now it is preserved.
1881
1882 TF/06 Save $spam_score, $spam_bar, and $spam_report in spool files, so
1883       that they are available at delivery time.
1884
1885 TF/07 Fix the way ${extract is skipped in the untaken branch of a conditional.
1886
1887 TF/08 TLS error reporting now respects the incoming_interface and
1888       incoming_port log selectors.
1889
1890 TF/09 Produce a more useful error message if an SMTP transport's hosts
1891       setting expands to an empty string.
1892
1893 NM/06 Bugzilla 744: EXPN did not work under TLS.
1894       Patch provided by Phil Pennock.
1895
1896 NM/07 Bugzilla 769: Extraneous comma in usage fprintf
1897       Patch provided by Richard Godbee.
1898
1899 NM/08 Fixed erroneous documentation references to smtp_notquit_acl to be
1900       acl_smtp_notquit, added index entry.
1901
1902 NM/09 Bugzilla 787: Potential buffer overflow in string_format.
1903       Patch provided by Eugene Bujak.
1904
1905 NM/10 Bugzilla 770: Problem on some platforms modifying the len parameter to
1906       accept(). Patch provided by Maxim Dounin.
1907
1908 NM/11 Bugzilla 749: Preserve old behaviour of blanks comparing equal to zero.
1909       Patch provided by Phil Pennock.
1910
1911 NM/12 Bugzilla 497: Correct behaviour of exiwhat when no config exists.
1912
1913 NM/13 Bugzilla 590: Correct handling of Resent-Date headers.
1914       Patch provided by Brad "anomie" Jorsch.
1915
1916 NM/14 Bugzilla 622: Added timeout setting to transport filter.
1917       Patch provided by Dean Brooks.
1918
1919 TK/05 Add native DKIM support (does not depend on external libraries).
1920
1921 NM/15 Bugzilla 854: Removed code that symlinks to pcre as its no longer useful.
1922       Patch provided by Graeme Fowler.
1923
1924 NM/16 Bugzilla 851: Documentation example syntax fix.
1925
1926 NM/17 Changed NOTICE file to remove references to embedded PCRE.
1927
1928 NM/18 Bugzilla 894: Fix issue with very long lines including comments in
1929       lsearch.
1930
1931 NM/19 Bugzilla 745: TLS version reporting.
1932       Patch provided by Phil Pennock.
1933
1934 NM/20 Bugzilla 167: bool: condition support.
1935       Patch provided by Phil Pennock.
1936
1937 NM/21 Bugzilla 665: gnutls_compat_mode to allow compatibility with broken
1938       clients. Patch provided by Phil Pennock.
1939
1940 NM/22 Bugzilla 607: prepend (not append) Resent-Message-ID and Resent-Date.
1941       Patch provided by Brad "anomie" Jorsch.
1942
1943 NM/23 Bugzilla 687: Fix misparses in eximstats.
1944       Patch provided by Heiko Schlittermann.
1945
1946 NM/24 Bugzilla 688: Fix exiwhat to handle log_selector = +pid.
1947       Patch provided by Heiko Schlittermann.
1948
1949 NM/25 Bugzilla 727: Use transport mode as default mode for maildirsize file.
1950       plus update to original patch.
1951
1952 NM/26 Bugzilla 799: Documentation correction for ratelimit.
1953
1954 NM/27 Bugzilla 802: Improvements to local interface IP addr detection.
1955       Patch provided by David Brownlee.
1956
1957 NM/28 Bugzilla 807: Improvements to LMTP delivery logging.
1958
1959 NM/29 Bugzilla 862, 866, 875: Documentation bugfixes.
1960
1961 NM/30 Bugzilla 888: TLS documentation bugfixes.
1962
1963 NM/31 Bugzilla 896: Dovecot buffer overrun fix.
1964
1965 NM/32 Bugzilla 889: Change all instances of "expr" in shell scripts to "expr --"
1966       Unlike the original bugzilla I have changed all shell scripts in src tree.
1967
1968 NM/33 Bugzilla 898: Transport filter timeout fix.
1969       Patch by Todd Rinaldo.
1970
1971 NM/34 Bugzilla 901: Fix sign/unsigned and UTF mismatches.
1972       Patch by Serge Demonchaux.
1973
1974 NM/35 Bugzilla 39: Base64 decode bug fixes.
1975       Patch by Jakob Hirsch.
1976
1977 NM/36 Bugzilla 909: Correct connect() call in dcc code.
1978
1979 NM/37 Bugzilla 910: Correct issue with relaxed/simple handling.
1980
1981 NM/38 Bugzilla 908: Removed NetBSD3 support as no longer needed.
1982
1983 NM/39 Bugzilla 911: Fixed MakeLinks build script.
1984
1985
1986 Exim version 4.69
1987 -----------------
1988
1989 TK/01 Add preliminary DKIM support. Currently requires a forked version of
1990       ALT-N's libdkim that I have put here:
1991       http://duncanthrax.net/exim-experimental/
1992
1993       Note to Michael Haardt: I had to rename some vars in sieve.c. They
1994       were called 'true' and it seems that C99 defines that as a reserved
1995       keyword to be used with 'bool' variable types. That means you could
1996       not include C99-style headers which use bools without triggering
1997       build errors in sieve.c.
1998
1999 NM/01 Bugzilla 592: --help option is handled incorrectly if exim is invoked
2000       as mailq or other aliases.  Changed the --help handling significantly
2001       to do whats expected.  exim_usage() emits usage/help information.
2002
2003 SC/01 Added the -bylocaldomain option to eximstats.
2004
2005 NM/02 Bugzilla 619: Defended against bad data coming back from gethostbyaddr.
2006
2007 NM/03 Bugzilla 613: Documentation fix for acl_not_smtp.
2008
2009 NM/04 Bugzilla 628: PCRE update to 7.4 (work done by John Hall).
2010
2011
2012 Exim version 4.68
2013 -----------------
2014
2015 PH/01 Another patch from the Sieve maintainer.
2016
2017 PH/02 When an IPv6 address is converted to a string for single-key lookup
2018       in an address list (e.g. for an item such as "net24-dbm;/net/works"),
2019       dots are used instead of colons so that keys in lsearch files need not
2020       contain colons. This was done some time before quoting was made available
2021       in lsearch files. However, iplsearch files do require colons in IPv6 keys
2022       (notated using the quote facility) so as to distinguish them from IPv4
2023       keys. This meant that lookups for IP addresses in host lists did not work
2024       for iplsearch lookups.
2025
2026       This has been fixed by arranging for IPv6 addresses to be expressed with
2027       colons if the lookup type is iplsearch. This is not incompatible, because
2028       previously such lookups could never work.
2029
2030       The situation is now rather anomalous, since one *can* have colons in
2031       ordinary lsearch keys. However, making the change in all cases is
2032       incompatible and would probably break a number of configurations.
2033
2034 TK/01 Change PRVS address formatting scheme to reflect latests BATV draft
2035       version.
2036
2037 MH/01 The "spam" ACL condition code contained a sscanf() call with a %s
2038       conversion specification without a maximum field width, thereby enabling
2039       a rogue spamd server to cause a buffer overflow. While nobody in their
2040       right mind would setup Exim to query an untrusted spamd server, an
2041       attacker that gains access to a server running spamd could potentially
2042       exploit this vulnerability to run arbitrary code as the Exim user.
2043
2044 TK/02 Bugzilla 502: Apply patch to make the SPF-Received: header use
2045       $primary_hostname instead of what libspf2 thinks the hosts name is.
2046
2047 MH/02 The dsearch lookup now uses lstat(2) instead of stat(2) to look for
2048       a directory entry by the name of the lookup key. Previously, if a
2049       symlink pointed to a non-existing file or a file in a directory that
2050       Exim lacked permissions to read, a lookup for a key matching that
2051       symlink would fail. Now it is enough that a matching directory entry
2052       exists, symlink or not. (Bugzilla 503.)
2053
2054 PH/03 The body_linecount and body_zerocount variables are now exported in the
2055       local_scan API.
2056
2057 PH/04 Added the $dnslist_matched variable.
2058
2059 PH/05 Unset $tls_cipher and $tls_peerdn before making a connection as a client.
2060       This means they are set thereafter only if the connection becomes
2061       encrypted.
2062
2063 PH/06 Added the client_condition to authenticators so that some can be skipped
2064       by clients under certain conditions.
2065
2066 PH/07 The error message for a badly-placed control=no_multiline_responses left
2067       "_responses" off the end of the name.
2068
2069 PH/08 Added -Mvc to output a copy of a message in RFC 2822 format.
2070
2071 PH/09 Tidied the code for creating ratelimiting keys, creating them explicitly
2072       (without spaces) instead of just copying the configuration text.
2073
2074 PH/10 Added the /noupdate option to the ratelimit ACL condition.
2075
2076 PH/11 Added $max_received_linelength.
2077
2078 PH/12 Added +ignore_defer and +include_defer to host lists.
2079
2080 PH/13 Installed PCRE version 7.2. This needed some changes because of the new
2081       way in which PCRE > 7.0 is built.
2082
2083 PH/14 Implemented queue_only_load_latch.
2084
2085 PH/15 Removed an incorrect (int) cast when reading the value of SIZE in a
2086       MAIL command. The effect was to mangle the value on 64-bit systems.
2087
2088 PH/16 Another patch from the Sieve maintainer.
2089
2090 PH/17 Added the NOTQUIT ACL, based on a patch from Ted Cooper.
2091
2092 PH/18 If a system quota error occurred while trying to create the file for
2093       a maildir delivery, the message "Mailbox is full" was not appended to the
2094       bounce if the delivery eventually timed out. Change 4.67/27 below applied
2095       only to a quota excession during the actual writing of the file.
2096
2097 PH/19 It seems that peer DN values may contain newlines (and other non-printing
2098       characters?) which causes problems in log lines. The DN values are now
2099       passed through string_printing() before being added to log lines.
2100
2101 PH/20 Added the "servers=" facility to MySQL and PostgreSQL lookups. (Oracle
2102       and InterBase are left for another time.)
2103
2104 PH/21 Added message_body_newlines option.
2105
2106 PH/22 Guard against possible overflow in moan_check_errorcopy().
2107
2108 PH/23 POSIX allows open() to be a macro; guard against that.
2109
2110 PH/24 If the recipient of an error message contained an @ in the local part
2111       (suitably quoted, of course), incorrect values were put in $domain and
2112       $local_part during the evaluation of errors_copy.
2113
2114
2115 Exim version 4.67
2116 -----------------
2117
2118 MH/01 Fix for bug #448, segfault in Dovecot authenticator when interface_address
2119       is unset (happens when testing with -bh and -oMi isn't used). Thanks to
2120       Jan Srzednicki.
2121
2122 PH/01 Added a new log selector smtp_no_mail, to log SMTP sessions that do not
2123       issue a MAIL command.
2124
2125 PH/02 In an ACL statement such as
2126
2127         deny dnslists = X!=127.0.0.2 : X=127.0.0.2
2128
2129       if a client was not listed at all, or was listed with a value other than
2130       127.0.0.2, in the X list, but was listed with 127.0.0.2 in the Y list,
2131       the condition was not true (as it should be), so access was not denied.
2132       The bug was that the ! inversion was incorrectly passed on to the second
2133       item. This has been fixed.
2134
2135 PH/03 Added additional dnslists conditions == and =& which are different from
2136       = and & when the dns lookup returns more than one IP address.
2137
2138 PH/04 Added gnutls_require_{kx,mac,protocols} to give more control over the
2139       cipher suites used by GnuTLS. These options are ignored by OpenSSL.
2140
2141 PH/05 After discussion on the list, added a compile time option ENABLE_DISABLE_
2142       FSYNC, which compiles an option called disable_fsync that allows for
2143       bypassing fsync(). The documentation is heavily laced with warnings.
2144
2145 SC/01 Updated eximstats to collate all SpamAssassin rejects into one bucket.
2146
2147 PH/06 Some tidies to the infrastructure of the Test Suite that is concerned
2148       with the auxiliary C programs that it uses: (1) Arrange for BIND_8_COMPAT
2149       to be defined when compiling on OSX (Darwin); (2) Tidies to the Makefile,
2150       including adding "make clean"; (3) Added -fPIC when compiling the test
2151       dynamically loaded module, to get rid of a warning.
2152
2153 MH/02 Fix for bug #451, causing paniclog entries to be written if a bounce
2154       message fails, move_frozen_messages = true and ignore_bounce_errors_after
2155       = 0s. The bug is otherwise harmless.
2156
2157 PH/07 There was a bug in the dovecot authenticator such that the value of
2158       $auth1 could be overwritten, and so not correctly preserved, after a
2159       successful authentication. This usually meant that the value preserved by
2160       the server_setid option was incorrect.
2161
2162 PH/08 Added $smtp_count_at_connection_start, deliberately with a long name.
2163
2164 PH/09 Installed PCRE release 7.0.
2165
2166 PH/10 The acl_not_smtp_start ACL was, contrary to the documentation, not being
2167       run for batched SMTP input. It is now run at the start of every message
2168       in the batch. While fixing this I discovered that the process information
2169       (output by running exiwhat) was not always getting set for -bs and -bS
2170       input. This is fixed, and it now also says "batched" for BSMTP.
2171
2172 PH/11 Added control=no_pipelining.
2173
2174 PH/12 Added $sending_ip_address and $sending_port (mostly Magnus Holmgren's
2175       patch, slightly modified), and move the expansion of helo_data till after
2176       the connection is made in the smtp transport (so it can use these
2177       values).
2178
2179 PH/13 Added ${rfc2047d: to decoded RFC 2047 strings.
2180
2181 PH/14 Added log_selector = +pid.
2182
2183 PH/15 Flush SMTP output before delaying, unless control=no_delay_flush is set.
2184
2185 PH/16 Add ${if forany and ${if forall.
2186
2187 PH/17 Added dsn_from option to vary the From: line in DSNs.
2188
2189 PH/18 Flush SMTP output before performing a callout, unless control =
2190       no_callout_flush is set.
2191
2192 PH/19 Change 4.64/PH/36 introduced a bug: when address_retry_include_sender
2193       was true (the default) a successful delivery failed to delete the retry
2194       item, thus causing premature timeout of the address. The bug is now
2195       fixed.
2196
2197 PH/20 Added hosts_avoid_pipelining to the smtp transport.
2198
2199 PH/21 Long custom messages for fakedefer and fakereject are now split up
2200       into multiline responses in the same way that messages for "deny" and
2201       other ACL rejections are.
2202
2203 PH/22 Applied Jori Hamalainen's speed-up changes and typo fixes to exigrep,
2204       with slight modification.
2205
2206 PH/23 Applied sieve patches from the maintainer "tracking the latest notify
2207       draft, changing the syntax and factoring some duplicate code".
2208
2209 PH/24 When the log selector "outgoing_port" was set, the port was shown as -1
2210       for deliveries of the second and subsequent messages over the same SMTP
2211       connection.
2212
2213 PH/25 Applied Magnus Holmgren's patch for ${addresses, ${map, ${filter, and
2214       ${reduce, with only minor "tidies".
2215
2216 SC/02 Applied Daniel Tiefnig's patch to improve the '($parent) =' pattern match.
2217
2218 PH/26 Added a "continue" ACL modifier that does nothing, for the benefit of its
2219       expansion side effects.
2220
2221 PH/27 When a message times out after an over-quota error from an Exim-imposed
2222       quota, the bounce message says "mailbox is full". This message was not
2223       being given when it was a system quota that was exceeded. It now should
2224       be the same.
2225
2226 MH/03 Made $recipients available in local_scan(). local_scan() already has
2227       better access to the recipient list through recipients_list[], but
2228       $recipients can be useful in postmaster-provided expansion strings.
2229
2230 PH/28 The $smtp_command and $smtp_command_argument variables were not correct
2231       in the case of a MAIL command with additional options following the
2232       address, for example: MAIL FROM:<foo@bar> SIZE=1234. The option settings
2233       were accidentally chopped off.
2234
2235 PH/29 SMTP synchronization checks are implemented when a command is read -
2236       there is a check that no more input is waiting when there shouldn't be
2237       any. However, for some commands, a delay in an ACL can mean that it is
2238       some time before the response is written. In this time, more input might
2239       arrive, invalidly. So now there are extra checks after an ACL has run for
2240       HELO/EHLO and after the predata ACL, and likewise for MAIL and RCPT when
2241       pipelining has not been advertised.
2242
2243 PH/30 MH's patch to allow iscntrl() characters to be list separators.
2244
2245 PH/31 Unlike :fail:, a custom message specified with :defer: was not being
2246       returned in the SMTP response when smtp_return_error_details was false.
2247       This has been fixed.
2248
2249 PH/32 Change the Dovecot authenticator to use read() and write() on the socket
2250       instead of the C I/O that was originally supplied, because problems were
2251       reported on Solaris.
2252
2253 PH/33 Compile failed with OpenSSL 0.9.8e. This was due to a coding error in
2254       Exim which did not show up earlier: it was assuming that a call to
2255       SSL_CTX_set_info_callback() might give an error value. In fact, there is
2256       no error. In previous releases of OpenSSL, SSL_CTX_set_info_callback()
2257       was a macro that became an assignment, so it seemed to work. This has
2258       changed to a proper function call with a void return, hence the compile
2259       error. Exim's code has been fixed.
2260
2261 PH/34 Change HDA_SIZE in oracle.c from 256 to 512. This is needed for 64-bit
2262       cpus.
2263
2264 PH/35 Applied a patch from the Sieve maintainer which fixes a bug in "notify".
2265
2266 PH/36 Applied John Jetmore's patch to add -v functionality to exigrep.
2267
2268 PH/37 If a message is not accepted after it has had an id assigned (e.g.
2269       because it turns out to be too big or there is a timeout) there is no
2270       "Completed" line in the log. When some messages of this type were
2271       selected by exigrep, they were listed as "not completed". Others were
2272       picked up by some special patterns. I have improved the selection
2273       criteria to be more general.
2274
2275 PH/38 The host_find_failed option in the manualroute router can now be set
2276       to "ignore", to completely ignore a host whose IP address cannot be
2277       found. If all hosts are ignored, the behaviour is controlled by the new
2278       host_all_ignored option.
2279
2280 PH/39 In a list of hosts for manualroute, if one item (either because of multi-
2281       homing or because of multiple MX records with /mx) generated more than
2282       one IP address, and the following item turned out to be the local host,
2283       all the secondary addresses of the first item were incorrectly removed
2284       from the list, along with the local host and any following hosts (which
2285       is what is supposed to happen).
2286
2287 PH/40 When Exim receives a message, it writes the login name, uid, and gid of
2288       whoever called Exim into the -H file. In the case of the daemon it was
2289       behaving confusingly. When first started, it used values for whoever
2290       started the daemon, but after a SIGHUP it used the Exim user (because it
2291       calls itself on a restart). I have changed the code so that it now always
2292       uses the Exim user.
2293
2294 PH/41 (Following a suggestion from Tony Finch) If all the RCPT commands in a
2295       message are rejected with the same error (e.g. no authentication or bad
2296       sender address), and a DATA command is nevertheless sent (as can happen
2297       with PIPELINING or a stupid MUA), the error message that was given to the
2298       RCPT commands is included in the rejection of the DATA command. This is
2299       intended to be helpful for MUAs that show only the final error to their
2300       users.
2301
2302 PH/42 Another patch from the Sieve maintainer.
2303
2304 SC/02 Eximstats - Differentiate between permanent and temporary rejects.
2305       Eximstats - Fixed some broken HTML links and added missing column headers
2306                   (Jez Hancock).
2307       Eximstats - Fixed Grand Total Summary Domains, Edomains, and Email
2308                   columns for Rejects, Temp Rejects, Ham, and Spam rows.
2309
2310 SC/03 Eximstats - V1.58 Fix to get <> and blackhole to show in edomain tables.
2311
2312 PH/43 Yet another patch from the Sieve maintainer.
2313
2314 PH/44 I found a way to check for a TCP/IP connection going away before sending
2315       the response to the final '.' that terminates a message, but only in the
2316       case where the client has not sent further data following the '.'
2317       (unfortunately, this is allowed). However, in many cases there won't be
2318       any further data because there won't be any more messages to send. A call
2319       to select() can be used: if it shows that the input is "ready", there is
2320       either input waiting, or the socket has been closed. An attempt to read
2321       the next input character can distinguish the two cases. Previously, Exim
2322       would have sent an OK response which the client would never have see.
2323       This could lead to message repetition. This fix should cure that, at
2324       least in a lot of common cases.
2325
2326 PH/45 Do not advertise STARTTLS in response to HELP unless it would be
2327       advertised in response to EHLO.
2328
2329
2330 Exim version 4.66
2331 -----------------
2332
2333 PH/01 Two more bugs that were introduced by 4.64/PH/07, in addition to the one
2334       fixed by 4.65/MH/01 (is this a record?) are fixed:
2335
2336       (i)  An empty string was always treated as zero by the numeric comparison
2337            operators. This behaviour has been restored.
2338
2339       (ii) It is documented that the numeric comparison operators always treat
2340            their arguments as decimal numbers. This was broken in that numbers
2341            starting with 0 were being interpreted as octal.
2342
2343       While fixing these problems I realized that there was another issue that
2344       hadn't been noticed. Values of message_size_limit (both the global option
2345       and the transport option) were treated as octal if they started with 0.
2346       The documentation was vague. These values are now always treated as
2347       decimal, and I will make that clear in the documentation.
2348
2349
2350 Exim version 4.65
2351 -----------------
2352
2353 TK/01 Disable default definition of HAVE_LINUX_SENDFILE. Clashes with
2354       Linux large file support (_FILE_OFFSET_BITS=64) on older glibc
2355       versions. (#438)
2356
2357 MH/01 Don't check that the operands of numeric comparison operators are
2358       integers when their expansion is in "skipping" mode (fixes bug
2359       introduced by 4.64-PH/07).
2360
2361 PH/01 If a system filter or a router generates more than SHRT_MAX (32767)
2362       child addresses, Exim now panics and dies. Previously, because the count
2363       is held in a short int, deliveries were likely to be lost. As such a
2364       large number of recipients for a single message is ridiculous
2365       (performance will be very, very poor), I have chosen to impose a limit
2366       rather than extend the field.
2367
2368
2369 Exim version 4.64
2370 -----------------
2371
2372 TK/01 Bugzilla #401. Fix DK spooling code so that it can overwrite a
2373       leftover -K file (the existence of which was triggered by #402).
2374       While we were at it, introduced process PID as part of the -K
2375       filename. This should rule out race conditions when creating
2376       these files.
2377
2378 TK/02 Bugzilla #402. Apply patch from Simon Arlott, speeding up DK signing
2379       processing considerably. Previous code took too long for large mails,
2380       triggering a timeout which in turn triggers #401.
2381
2382 TK/03 Introduced HAVE_LINUX_SENDFILE to os.h-Linux. Currently only used
2383       in the DK code in transports.c. sendfile() is not really portable,
2384       hence the _LINUX specificness.
2385
2386 TF/01 In the add_headers option to the mail command in an Exim filter,
2387       there was a bug that Exim would claim a syntax error in any
2388       header after the first one which had an odd number of characters
2389       in the field name.
2390
2391 PH/01 If a server that rejects MAIL FROM:<> was the target of a sender
2392       callout verification, Exim cached a "reject" for the entire domain. This
2393       is correct for most verifications, but it is not correct for a recipient
2394       verification with use_sender or use_postmaster set, because in that case
2395       the callout does not use MAIL FROM:<>. Exim now distinguishes the special
2396       case of MAIL FROM:<> rejection from other early rejections (e.g.
2397       rejection of HELO). When verifying a recipient using a non-null MAIL
2398       address, the cache is ignored if it shows MAIL FROM:<> rejection.
2399       Whatever the result of the callout, the value of the domain cache is
2400       left unchanged (for any other kind of callout, getting as far as trying
2401       RCPT means that the domain itself is ok).
2402
2403 PH/02 Tidied a number of unused variable and signed/unsigned warnings that
2404       gcc 4.1.1 threw up.
2405
2406 PH/03 On Solaris, an unexpectedly close socket (dropped connection) can
2407       manifest itself as EPIPE rather than ECONNECT. When tidying away a
2408       session, the daemon ignores ECONNECT errors and logs others; it now
2409       ignores EPIPE as well.
2410
2411 PH/04 Applied Nico Erfurth's refactoring patch to tidy up mime.c
2412       (quoted-printable decoding).
2413
2414 PH/05 Applied Nico Erfurth's refactoring patch to tidy up spool_mbox.c, and
2415       later the small subsequent patch to fix an introduced bug.
2416
2417 PH/06 Installed the latest Cygwin Makefile from the Cygwin maintainer.
2418
2419 PH/07 There was no check for overflow in expansions such as ${if >{1}{4096M}}.
2420
2421 PH/08 An error is now given if message_size_limit is specified negative.
2422
2423 PH/09 Applied and tidied up Jakob Hirsch's patch for allowing ACL variables
2424       to be given (somewhat) arbitrary names.
2425
2426 JJ/01 exipick 20060919.0, allow for arbitrary acl_ variables introduced
2427       in 4.64-PH/09.
2428
2429 JJ/02 exipick 20060919.0, --show-vars args can now be regular expressions,
2430       miscellaneous code fixes
2431
2432 PH/10 Added the log_reject_target ACL modifier to specify where to log
2433       rejections.
2434
2435 PH/11 Callouts were setting the name used for EHLO/HELO from $smtp_active_
2436       hostname. This is wrong, because it relates to the incoming message (and
2437       probably the interface on which it is arriving) and not to the outgoing
2438       callout (which could be using a different interface). This has been
2439       changed to use the value of the helo_data option from the smtp transport
2440       instead - this is what is used when a message is actually being sent. If
2441       there is no remote transport (possible with a router that sets up host
2442       addresses), $smtp_active_hostname is used.
2443
2444 PH/12 Installed Andrey Panin's patch to add a dovecot authenticator. Various
2445       tweaks were necessary in order to get it to work (see also 21 below):
2446       (a) The code assumed that strncpy() returns a negative number on buffer
2447           overflow, which isn't the case. Replaced with Exim's string_format()
2448           function.
2449       (b) There were several signed/unsigned issues. I just did the minimum
2450           hacking in of casts. There is scope for a larger refactoring.
2451       (c) The code used strcasecmp() which is not a standard C function.
2452           Replaced with Exim's strcmpic() function.
2453       (d) The code set only $1; it now sets $auth1 as well.
2454       (e) A simple test gave the error "authentication client didn't specify
2455           service in request". It would seem that Dovecot has changed its
2456           interface. Fortunately there's a specification; I followed it and
2457           changed what the client sends and it appears to be working now.
2458
2459 PH/13 Added $message_headers_raw to provide the headers without RFC 2047
2460       decoding.
2461
2462 PH/14 Corrected misleading output from -bv when -v was also used. Suppose the
2463       address A is aliased to B and C, where B exists and C does not. Without
2464       -v the output is "A verified" because verification stops after a
2465       successful redirection if more than one address is generated. However,
2466       with -v the child addresses are also verified. Exim was outputting "A
2467       failed to verify" and then showing the successful verification for C,
2468       with its parentage. It now outputs "B failed to verify", showing B's
2469       parentage before showing the successful verification of C.
2470
2471 PH/15 Applied Michael Deutschmann's patch to allow DNS black list processing to
2472       look up a TXT record in a specific list after matching in a combined
2473       list.
2474
2475 PH/16 It seems that the options setting for the resolver (RES_DEFNAMES and
2476       RES_DNSRCH) can affect the behaviour of gethostbyname() and friends when
2477       they consult the DNS. I had assumed they would set it the way they
2478       wanted; and indeed my experiments on Linux seem to show that in some
2479       cases they do (I could influence IPv6 lookups but not IPv4 lookups).
2480       To be on the safe side, however, I have now made the interface to
2481       host_find_byname() similar to host_find_bydns(), with an argument
2482       containing the DNS resolver options. The host_find_byname() function now
2483       sets these options at its start, just as host_find_bydns() does. The smtp
2484       transport options dns_qualify_single and dns_search_parents are passed to
2485       host_find_byname() when gethostbyname=TRUE in this transport. Other uses
2486       of host_find_byname() use the default settings of RES_DEFNAMES
2487       (qualify_single) but not RES_DNSRCH (search_parents).
2488
2489 PH/17 Applied (a modified version of) Nico Erfurth's patch to make
2490       spool_read_header() do less string testing, by means of a preliminary
2491       switch on the second character of optional "-foo" lines. (This is
2492       overdue, caused by the large number of possibilities that now exist.
2493       Originally there were few.) While I was there, I also converted the
2494       str(n)cmp tests so they don't re-test the leading "-" and the first
2495       character, in the hope this might squeeze out yet more improvement.
2496
2497 PH/18 Two problems with "group" syntax in header lines when verifying: (1) The
2498       flag allowing group syntax was set by the header_syntax check but not
2499       turned off, possible causing trouble later; (2) The flag was not being
2500       set at all for the header_verify test, causing "group"-style headers to
2501       be rejected. I have now set it in this case, and also caused header_
2502       verify to ignore an empty address taken from a group. While doing this, I
2503       came across some other cases where the code for allowing group syntax
2504       while scanning a header line wasn't quite right (mostly, not resetting
2505       the flag correctly in the right place). These bugs could have caused
2506       trouble for malformed header lines. I hope it is now all correct.
2507
2508 PH/19 The functions {pwcheck,saslauthd}_verify_password() are always called
2509       with the "reply" argument non-NULL. The code, however (which originally
2510       came from elsewhere) had *some* tests for NULL when it wrote to *reply,
2511       but it didn't always do it. This confused somebody who was copying the
2512       code for some other use. I have removed all the tests.
2513
2514 PH/20 It was discovered that the GnuTLS code had support for RSA_EXPORT, a
2515       feature that was used to support insecure browsers during the U.S. crypto
2516       embargo. It requires special client support, and Exim is probably the
2517       only MTA that supported it -- and would never use it because real RSA is
2518       always available. This code has been removed, because it had the bad
2519       effect of slowing Exim down by computing (never used) parameters for the
2520       RSA_EXPORT functionality.
2521
2522 PH/21 On the advice of Timo Sirainen, added a check to the dovecot
2523       authenticator to fail if there's a tab character in the incoming data
2524       (there should never be unless someone is messing about, as it's supposed
2525       to be base64-encoded). Also added, on Timo's advice, the "secured" option
2526       if the connection is using TLS or if the remote IP is the same as the
2527       local IP, and the "valid-client-cert option" if a client certificate has
2528       been verified.
2529
2530 PH/22 As suggested by Dennis Davis, added a server_condition option to *all*
2531       authenticators. This can be used for authorization after authentication
2532       succeeds. (In the case of plaintext, it servers for both authentication
2533       and authorization.)
2534
2535 PH/23 Testing for tls_required and lost_connection in a retry rule didn't work
2536       if any retry times were supplied.
2537
2538 PH/24 Exim crashed if verify=helo was activated during an incoming -bs
2539       connection, where there is no client IP address to check. In this
2540       situation, the verify now always succeeds.
2541
2542 PH/25 Applied John Jetmore's -Mset patch.
2543
2544 PH/26 Added -bem to be like -Mset, but loading a message from a file.
2545
2546 PH/27 In a string expansion for a processed (not raw) header when multiple
2547       headers of the same name were present, leading whitespace was being
2548       removed from all of them, but trailing whitespace was being removed only
2549       from the last one. Now trailing whitespace is removed from each header
2550       before concatenation. Completely empty headers in a concatenation (as
2551       before) are ignored.
2552
2553 PH/28 Fixed bug in backwards-compatibility feature of PH/09 (thanks to John
2554       Jetmore). It would have mis-read ACL variables from pre-4.61 spool files.
2555
2556 PH/29 [Removed. This was a change that I later backed out, and forgot to
2557       correct the ChangeLog entry (that I had efficiently created) before
2558       committing the later change.]
2559
2560 PH/30 Exim was sometimes attempting to deliver messages that had suffered
2561       address errors (4xx response to RCPT) over the same connection as other
2562       messages routed to the same hosts. Such deliveries are always "forced",
2563       so retry times are not inspected. This resulted in far too many retries
2564       for the affected addresses. The effect occurred only when there were more
2565       hosts than the hosts_max_try setting in the smtp transport when it had
2566       the 4xx errors. Those hosts that it had tried were not added to the list
2567       of hosts for which the message was waiting, so if all were tried, there
2568       was no problem. Two fixes have been applied:
2569
2570       (i)  If there are any address or message errors in an SMTP delivery, none
2571            of the hosts (tried or untried) are now added to the list of hosts
2572            for which the message is waiting, so the message should not be a
2573            candidate for sending over the same connection that was used for a
2574            successful delivery of some other message. This seems entirely
2575            reasonable: after all the message is NOT "waiting for some host".
2576            This is so "obvious" that I'm not sure why it wasn't done
2577            previously. Hope I haven't missed anything, but it can't do any
2578            harm, as the worst effect is to miss an optimization.
2579
2580       (ii) If, despite (i), such a delivery is accidentally attempted, the
2581            routing retry time is respected, so at least it doesn't keep
2582            hammering the server.
2583
2584 PH/31 Installed Andrew Findlay's patch to close the writing end of the socket
2585       in ${readsocket because some servers need this prod.
2586
2587 PH/32 Added some extra debug output when updating a wait-xxx database.
2588
2589 PH/33 The hint "could be header name not terminated by colon", which has been
2590       given for certain expansion errors for a long time, was not being given
2591       for the ${if def:h_colon_omitted{...  case.
2592
2593 PH/34 The spec says: "With one important exception, whenever a domain list is
2594       being scanned, $domain contains the subject domain." There was at least
2595       one case where this was not true.
2596
2597 PH/35 The error "getsockname() failed: connection reset by peer" was being
2598       written to the panic log as well as the main log, but it isn't really
2599       panic-worthy as it just means the connection died rather early on. I have
2600       removed the panic log writing for the ECONNRESET error when getsockname()
2601       fails.
2602
2603 PH/36 After a 4xx response to a RCPT error, that address was delayed (in queue
2604       runs only) independently of the message's sender address. This meant
2605       that, if the 4xx error was in fact related to the sender, a different
2606       message to the same recipient with a different sender could confuse
2607       things. In particular, this can happen when sending to a greylisting
2608       server, but other circumstances could also provoke similar problems.
2609       I have changed the default so that the retry time for these errors is now
2610       based a combination of the sender and recipient addresses. This change
2611       can be overridden by setting address_retry_include_sender=false in the
2612       smtp transport.
2613
2614 PH/37 For LMTP over TCP/IP (the smtp transport), error responses from the
2615       remote server are returned as part of bounce messages. This was not
2616       happening for LMTP over a pipe (the lmtp transport), but now it is the
2617       same for both kinds of LMTP.
2618
2619 PH/38 Despite being documented as not happening, Exim was rewriting addresses
2620       in header lines that were in fact CNAMEs. This is no longer the case.
2621
2622 PH/39 If -R or -S was given with -q<time>, the effect of -R or -S was ignored,
2623       and queue runs started by the daemon processed all messages. This has
2624       been fixed so that -R and -S can now usefully be given with -q<time>.
2625
2626 PH/40 Import PCRE release 6.7 (fixes some bugs).
2627
2628 PH/41 Add bitwise logical operations to eval (courtesy Brad Jorsch).
2629
2630 PH/42 Give an error if -q is specified more than once.
2631
2632 PH/43 Renamed the variables $interface_address and $interface_port as
2633       $received_ip_address and $received_port, to make it clear that these
2634       values apply to message reception, and not to the outgoing interface when
2635       a message is delivered. (The old names remain recognized, of course.)
2636
2637 PH/44 There was no timeout on the connect() call when using a Unix domain
2638       socket in the ${readsocket expansion. There now is.
2639
2640 PH/45 Applied a modified version of Brad Jorsch's patch to allow "message" to
2641       be meaningful with "accept".
2642
2643 SC/01 Eximstats V1.43
2644      Bug fix for V1.42 with -h0 specified. Spotted by Chris Lear.
2645
2646 SC/02 Eximstats V1.44
2647       Use a glob alias rather than an array ref in the generated
2648       parser. This improves both readability and performance.
2649
2650 SC/03 Eximstats V1.45 (Marco Gaiarin / Steve Campbell)
2651       Collect SpamAssassin and rejection statistics.
2652       Don't display local sender or destination tables unless
2653       there is data to show.
2654       Added average volumes into the top table text output.
2655
2656 SC/04 Eximstats V1.46
2657       Collect data on the number of addresses (recipients)
2658       as well as the number of messages.
2659
2660 SC/05 Eximstats V1.47
2661       Added 'Message too big' to the list of mail rejection
2662       reasons (thanks to Marco Gaiarin).
2663
2664 SC/06 Eximstats V1.48
2665       Mainlog lines which have GMT offsets and are too short to
2666       have a flag are now skipped.
2667
2668 SC/07 Eximstats V1.49 (Alain Williams)
2669       Added the -emptyok flag.
2670
2671 SC/08 Eximstats V1.50
2672       Fixes for obtaining the IP address from reject messages.
2673
2674 JJ/03 exipick.20061117.2, made header handling as similar to exim as possible
2675       (added [br]h_ prefixes, implemented RFC2047 decoding.  Fixed
2676       whitespace changes from 4.64-PH/27
2677
2678 JJ/04 exipick.20061117.2, fixed format and added $message_headers_raw to
2679       match 4.64-PH/13
2680
2681 JJ/05 exipick.20061117.2, bug fixes (error out sooner when invalid criteria
2682       are found, allow negative numbers in numeric criteria)
2683
2684 JJ/06 exipick.20061117.2, added new $message_body_missing variable
2685
2686 JJ/07 exipick.20061117.2, added $received_ip_address and $received_port
2687       to match changes made in 4.64-PH/43
2688
2689 PH/46 Applied Jori Hamalainen's patch to add features to exiqsumm.
2690
2691 PH/47 Put in an explicit test for a DNS lookup of an address record where the
2692       "domain" is actually an IP address, and force a failure. This locks out
2693       those revolvers/nameservers that support "A-for-A" lookups, in
2694       contravention of the specifications.
2695
2696 PH/48 When a host name was looked up from an IP address, and the subsequent
2697       forward lookup of the name timed out, the host name was left in
2698       $sender_host_name, contrary to the specification.
2699
2700 PH/49 Although default lookup types such as lsearch* or cdb*@ have always been
2701       restricted to single-key lookups, Exim was not diagnosing an error if
2702       * or *@ was used with a query-style lookup.
2703
2704 PH/50 Increased the value of DH_BITS in tls-gnu.c from 768 to 1024.
2705
2706 MH/01 local_scan ABI version incremented to 1.1. It should have been updated
2707       long ago, but noone interested enough thought of it. Let's just say that
2708       the "1.1" means that there are some new functions that weren't there at
2709       some point in the past.
2710
2711 PH/51 Error processing for expansion failure of helo_data from an smtp
2712       transport during callout processing was broken.
2713
2714 PH/52 Applied John Jetmore's patch to allow tls-on-connect and STARTTLS to be
2715       tested/used via the -bh/-bhc/-bs options.
2716
2717 PH/53 Added missing "#include <time.h>" to pcre/pcretest.c (this was a PCRE
2718       bug, fixed in subsequent PCRE releases).
2719
2720 PH/54 Applied Robert Bannocks' patch to avoid a problem with references that
2721       arises when using the Solaris LDAP libraries (but not with OpenLDAP).
2722
2723 PH/55 Check for a ridiculously long file name in exim_dbmbuild.
2724
2725
2726 Exim version 4.63
2727 -----------------
2728
2729 SC/01 Use a glob alias rather than an array ref in eximstats generated
2730       parser. This improves both readability and performance.
2731
2732 SC/02 Collect SpamAssassin and rejection statistics in eximstats.
2733       Don't display local sender or destination tables in eximstats unless
2734       there is data to show.
2735       Added average volumes into the eximstats top table text output.
2736
2737 SC/03 Collect data on the number of addresses (recipients) as well
2738       as the number of messages in eximstats.
2739
2740 TF/01 Correct an error in the documentation for the redirect router. Exim
2741       does (usually) call initgroups() when daemonizing.
2742
2743 TF/02 Call initgroups() when dropping privilege in exim.c, so that Exim runs
2744       with consistent privilege compared to when running as a daemon.
2745
2746 TF/03 Note in the spec that $authenticated_id is not set for local
2747       submissions from trusted users.
2748
2749 TF/04 The ratelimit per_rcpt option now works correctly in acl_not_smtp.
2750       Thanks to Dean Brooks <dean@iglou.com> for the patch.
2751
2752 TF/05 Make it easier to get SMTP authentication and TLS/SSL support working
2753       by adding some example configuration directives to the default
2754       configuration file. A little bit of work is required to uncomment the
2755       directives and define how usernames and passwords are checked, but
2756       there is now a framework to start from.
2757
2758 PH/01 Added #define LDAP_DEPRECATED 1 to ldap.c because some of the "old"
2759       functions that Exim currently uses aren't defined in ldap.h for OpenLDAP
2760       without this. I don't know how relevant this is to other LDAP libraries.
2761
2762 PH/02 Add the verb name to the "unknown ACL verb" error.
2763
2764 PH/03 Magnus Holmgren's patch for filter_prepend_home.
2765
2766 PH/03 Fixed Bugzilla #101: macro definition between ACLs doesn't work.
2767
2768 PH/04 Applied Magnus Holmgren's patch to fix Bugzilla #98: transport's home
2769       directory not expanded when it should be if an expanded home directory
2770       was set for the address (which is overridden by the transport).
2771
2772 PH/05 Applied Alex Kiernan's patch to fix Bugzilla #99: a problem with
2773       libradius.
2774
2775 PH/06 Added acl_not_smtp_start, based on Johannes Berg's patch, and set the
2776       bit to forbid control=suppress_local_fixups in the acl_not_smtp ACL,
2777       because it is too late at that time, and has no effect.
2778
2779 PH/07 Changed ${quote_pgsql to quote ' as '' instead of \' because of a
2780       security issue with \' (bugzilla #107). I could not use the
2781       PQescapeStringConn() function, because it needs a PGconn value as one of
2782       its arguments.
2783
2784 PH/08 When testing addresses using -bt, indicate those final addresses that
2785       are duplicates that would not cause an additional delivery. At least one
2786       person was confused, thinking that -bt output corresponded to deliveries.
2787       (Suppressing duplicates isn't a good idea as you lose the information
2788       about possibly different redirections that led to the duplicates.)
2789
2790 PH/09 Applied patch from Erik to use select() instead of poll() in spam.c on
2791       systems where poll() doesn't work, in particular OS X.
2792
2793 PH/10 Added more information to debugging output for retry time not reached.
2794
2795 PH/11 Applied patch from Arkadiusz Miskiewicz to apply a timeout to read
2796       operations in malware.c.
2797
2798 PH/12 Applied patch from Magnus Holmgren to include the "h" tag in Domain Keys
2799       signatures.
2800
2801 PH/13 If write_rejectlog was set false when logging was sent to syslog with
2802       syslog_duplication set false, log lines that would normally be written
2803       both the the main log and to the reject log were not written to syslog at
2804       all.
2805
2806 PH/14 In the default configuration, change the use of "message" in ACL warn
2807       statements to "add_header".
2808
2809 PH/15 Diagnose a filter syntax error for "seen", "unseen", or "noerror" if not
2810       not followed by a command (e.g. "seen endif").
2811
2812 PH/16 Recognize SMTP codes at the start of "message" in ACLs and after :fail:
2813       and :defer: in a redirect router. Add forbid_smtp_code to suppress the
2814       latter.
2815
2816 PH/17 Added extra conditions to the default value of delay_warning_condition
2817       so that it is now:
2818
2819         ${if or { \
2820             { !eq{$h_list-id:$h_list-post:$h_list-subscribe:}{} } \
2821             { match{$h_precedence:}{(?i)bulk|list|junk} } \
2822             { match{$h_auto-submitted:}{(?i)auto-generated|auto-replied} } \
2823             }{no}{yes}}
2824
2825       The Auto-Submitted: and various List- headers are standardised, whereas I
2826       don't think Precedence: ever was.
2827
2828 PH/18 Refactored debugging code in route_finduser() to show more information,
2829       in particular, the error code if getpwnam() issues one.
2830
2831 PH/19 Added PQsetClientEncoding(conn, "SQL_ASCII") to the pgsql code module.
2832       This is apparently needed in addition to the PH/07 change above to avoid
2833       any possible encoding problems.
2834
2835 PH/20 Perl can change the locale. Exim was resetting it after a ${perl call,
2836       but not after initializing Perl.
2837
2838 PH/21 Added a call to PQsetNoticeProcessor() to catch pgsql "notices" and
2839       output them only if debugging. By default they are written stderr,
2840       apparently, which is not desirable.
2841
2842 PH/22 Added Alain Williams' LDAP patch to support setting REFERRALS=off on
2843       queries.
2844
2845 JJ/01 exipick: added --reverse (and -R synonym), --random, --size, --sort and
2846       --not options
2847
2848 JJ/02 exipick: rewrote --help documentation to hopefully make more clear.
2849
2850 PH/23 Made -oMaa and -oMt work with -bh and -bs to pretend the connection is
2851       authenticated or an ident call has been made. Suppress the default
2852       values for $authenticated_id and $authenticated_sender (but permit -oMai
2853       and -oMas) when testing with -bh.
2854
2855 PH/24 Re-jigged the order of the tests in the default configuration so that the
2856       tests for valid domains and recipients precede the DNS black list and CSA
2857       tests, on the grounds that those ones are more expensive.
2858
2859 PH/25 Exim was not testing for a space following SMTP commands such as EHLO
2860       that require one. Thus, EHLORHUBARB was interpreted as a valid command.
2861       This bug exists in every version of Exim that I still have, right back to
2862       0.12.
2863
2864 PH/26 (n)wildlsearch lookups are documented as being done case-insensitively.
2865       However, an attempt to turn on case-sensitivity in a regex key by
2866       including (?-i) didn't work because the subject string was already
2867       lowercased, and the effects were non-intuitive. It turns out that a
2868       one-line patch can be used to allow (?-i) to work as expected.
2869
2870
2871 Exim version 4.62
2872 -----------------
2873
2874 TF/01 Fix the add_header change below (4.61 PH/55) which had a bug that (amongst
2875       other effects) broke the use of negated acl sub-conditions.
2876
2877 PH/01 ${readsocket now supports Internet domain sockets (modified John Jetmore
2878       patch).
2879
2880 PH/02 When tcp-wrappers is called from Exim, it returns only "deny" or "allow".
2881       "Deny" causes Exim to reject the incoming connection with a 554 error.
2882       Unfortunately, if there is a major crisis, such as a disk failure,
2883       tcp-wrappers gives "deny", whereas what one would like would be some
2884       kind of temporary error. A kludge has been added to help with this.
2885       Before calling hosts_ctl(), errno is set zero. If the result is "deny", a
2886       554 error is used if errno is still zero or contains ENOENT (which occurs
2887       if either of the /etc/hosts.{allow,deny} files is missing). Otherwise, a
2888       451 error is used.
2889
2890 PH/03 Add -lutil to the default FreeBSD LIBS setting.
2891
2892 PH/04 Change PH/19 for 4.61 was too wide. It should not be applied to host
2893       errors. Otherwise a message that provokes a temporary error (when other
2894       messages do not) can cause a whole host to time out.
2895
2896 PH/05 Batch deliveries by appendfile and pipe transports did not work when the
2897       addresses were routed directly to files or pipes from a redirect router.
2898       File deliveries just didn't batch; pipe deliveries might have suffered
2899       odd errors.
2900
2901 PH/06 A failure to get a lock for a hints database would erroneously always say
2902       "Failed to get write lock", even when it was really a read lock.
2903
2904 PH/07 The appendfile transport was creating MBX lock files with a fixed mode
2905       of 0600. This has been changed to use the value of the lockfile_mode
2906       option (which defaults to 0600).
2907
2908 PH/08 Applied small patch from the Sieve maintainer.
2909
2910 PH/09 If maildir_quota_directory_regex was set to exclude (say) the .Trash
2911       folder from quota calculations, a direct delivery into this folder messed
2912       up the contents of the maildirsize file. This was because the regex was
2913       used only to exclude .Trash (or whatever) when the size of the mailbox
2914       was calculated. There was no check that a delivery was happening into an
2915       excluded directory. This bug has been fixed by ignoring all quota
2916       processing for deliveries into excluded directories.
2917
2918 PH/10 Added the maildirfolder_create_regex option to appendfile.
2919
2920
2921 Exim version 4.61
2922 -----------------
2923
2924 PH/01 The code for finding all the local interface addresses on a FreeBSD
2925       system running IPv6 was broken. This may well have applied to all BSD
2926       systems, as well as to others that have similar system calls. The broken
2927       code found IPv4 interfaces correctly, but gave incorrect values for the
2928       IPv6 interfaces. In particular, ::1 was not found. The effect in Exim was
2929       that it would not match correctly against @[] and not recognize the IPv6
2930       addresses as local.
2931
2932 PH/02 The ipliteral router was not recognizing addresses of the form user@
2933       [ipv6:....] because it didn't know about the "ipv6:" prefix.
2934
2935 PH/03 Added disable_ipv6.
2936
2937 PH/04 Changed $reply_address to use the raw form of the headers instead of the
2938       decoded form, because it is most often used to construct To: headers
2939       lines in autoreplies, and the decoded form may well be syntactically
2940       invalid. However, $reply_address has leading white space removed, and all
2941       newlines turned into spaces so that the autoreply transport does not
2942       grumble.
2943
2944 PH/05 If group was specified without a user on a router, and no group or user
2945       was specified on a transport, the group from the router was ignored.
2946
2947 PH/06 Increased the number of ACL variables to 20 of each type, and arranged
2948       for visible compile-time settings that can be used to change these
2949       numbers, for those that want even more. Backwards compatibility with old
2950       spool files has been maintained. However, going back to a previous Exim
2951       release will lost any variables that are in spool files.
2952
2953 PH/07 Two small changes when running in the test harness: increase delay when
2954       passing a TCP/IP connection to a new process, in case the original
2955       process has to generate a bounce, and remove special handling of
2956       127.0.0.2 (sic), which is no longer necessary.
2957
2958 PH/08 Changed debug output of dbfn_open() flags from numbers to names, so as to
2959       be the same on different OS.
2960
2961 PH/09 Moved a debug statement in filter processing to avoid a race problem when
2962       testing.
2963
2964 JJ/01 exipick: fixed bug where -b (brief) output option showed "Vars:"
2965       whether --show-vars was specified or not
2966
2967 JJ/02 exipick: Added support for new ACL variable spool format introduced
2968       in 4.61-PH/06
2969
2970 PH/10 Fixed another bug related to PH/04 above: if an incoming message had a
2971       syntactically invalid From: or Reply-to: line, and a filter used this to
2972       generate an autoreply, and therefore failed to obtain an address for the
2973       autoreply, Exim could try to deliver to a non-existent relative file
2974       name, causing unrelated and misleading errors. What now happens is that
2975       it logs this as a hard delivery error, but does not attempt to create a
2976       bounce message.
2977
2978 PH/11 The exinext utility has a -C option for testing purposes, but although
2979       the given file was scanned by exinext itself; it wasn't being passed on
2980       when Exim was called.
2981
2982 PH/12 In the smtp transport, treat an explicit ECONNRESET error the same as
2983       an end-of-file indication when reading a command response.
2984
2985 PH/13 Domain literals for IPv6 were not recognized unless IPv6 support was
2986       compiled. In many other places in Exim, IPv6 addresses are always
2987       recognized, so I have changed this. It also means that IPv4 domain
2988       literals of the form [IPV4:n.n.n.n] are now always recognized.
2989
2990 PH/14 When a uid/gid is specified for the queryprogram router, it cannot be
2991       used if the router is not running as root, for example, when verifying at
2992       ACL time, or when using -bh. The debugging output from this situation was
2993       non-existent - all you got was a failure to exec. I have made two
2994       changes:
2995
2996       (a) Failures to set uid/gid, the current directory, or a process leader
2997           in a subprocess such as that created by queryprogram now generate
2998           suitable debugging output when -d is set.
2999
3000       (b) The queryprogram router detects when it is not running as root,
3001           outputs suitable debugging information if -d is set, and then runs
3002           the subprocess without attempting to change uid/gid.
3003
3004 PH/15 Minor change to Makefile for building test_host (undocumented testing
3005       feature).
3006
3007 PH/16 As discussed on the list in Nov/Dec: Exim no longer looks at the
3008       additional section of a DNS packet that returns MX or SRV records.
3009       Instead, it always explicitly searches for A/AAAA records. This avoids
3010       major problems that occur when a DNS server includes only records of one
3011       type (A or AAAA) in an MX/SRV packet. A byproduct of this change has
3012       fixed another bug: if SRV records were looked up and the corresponding
3013       address records were *not* found in the additional section, the port
3014       values from the SRV records were lost.
3015
3016 PH/17 If a delivery to a pipe, file, or autoreply was deferred, Exim was not
3017       using the correct key (the original address) when searching the retry
3018       rules in order to find which one to use for generating the retry hint.
3019
3020 PH/18 If quota_warn_message contains a From: header, Exim now refrains from
3021       adding the default one. Similarly, if it contains a Reply-To: header, the
3022       errors_reply_to option, if set, is not used.
3023
3024 PH/19 When calculating a retry time, Exim used to measure the "time since
3025       failure" by looking at the "first failed" field in the retry record. Now
3026       it does not use this if it is later than than the arrival time of the
3027       message. Instead it uses the arrival time. This makes for better
3028       behaviour in cases where some deliveries succeed, thus re-setting the
3029       "first failed" field. An example is a quota failure for a huge message
3030       when small messages continue to be delivered. Without this change, the
3031       "time since failure" will always be short, possible causing more frequent
3032       delivery attempts for the huge message than are intended.
3033       [Note: This change was subsequently modified - see PH/04 for 4.62.]
3034
3035 PH/20 Added $auth1, $auth2, $auth3 to contain authentication data (as well as
3036       $1, $2, $3) because the numerical variables can be reset during some
3037       expansion items (e.g. "match"), thereby losing the authentication data.
3038
3039 PH/21 Make -bV show the size of off_t variables so that the test suite can
3040       decide whether to run tests for quotas > 2G.
3041
3042 PH/22 Test the values given for quota, quota_filecount, quota_warn_threshold,
3043       mailbox_size, and mailbox_filecount in the appendfile transport. If a
3044       filecount value is greater than 2G or if a quota value is greater than 2G
3045       on a system where the size of off_t is not greater than 4, a panic error
3046       is given.
3047
3048 PH/23 When a malformed item such as 1.2.3/24 appears in a host list, it can
3049       never match. The debug and -bh output now contains an explicit error
3050       message indicating a malformed IPv4 address or mask.
3051
3052 PH/24 An host item such as 1.2.3.4/abc was being treated as the IP address
3053       1.2.3.4 without a mask. Now it is not recognized as an IP address, and
3054       PH/23 above applies.
3055
3056 PH/25 Do not write to syslog when running in the test harness. The only
3057       occasion when this arises is a failure to open the main or panic logs
3058       (for which there is an explicit test).
3059
3060 PH/26 Added the /no_tell option to "control=freeze".
3061
3062 PH/27 If a host name lookup failed very early in a connection, for example, if
3063       the IP address matched host_lookup and the reverse lookup yielded a name
3064       that did not have a forward lookup, an error message of the form "no IP
3065       address found for host xxx.xxx.xxx (during SMTP connection from NULL)"
3066       could be logged. Now it outputs the IP address instead of "NULL".
3067
3068 PH/28 An enabling patch from MH: add new function child_open_exim2() which
3069       allows the sender and the authenticated sender to be set when
3070       submitting a message from within Exim. Since child_open_exim() is
3071       documented for local_scan(), the new function should be too.
3072
3073 PH/29 In GnuTLS, a forced expansion failure for tls_privatekey was not being
3074       ignored. In both GnuTLS and OpenSSL, an expansion of tls_privatekey that
3075       results in an empty string is now treated as unset.
3076
3077 PH/30 Fix eximon buffer overflow bug (Bugzilla #73).
3078
3079 PH/31 Added sender_verify_fail logging option.
3080
3081 PH/32 In November 2003, the code in Exim that added an empty Bcc: header when
3082       needed by RFC 822 but not by RFC 2822 was commented out. I have now
3083       tidied the source and removed it altogether.
3084
3085 PH/33 When a queue run was abandoned because the load average was too high, a
3086       log line was always written; now it is written only if the queue_run log
3087       selector is set. In addition, the log line for abandonment now contains
3088       information about the queue run such as the pid. This is always present
3089       in "start" and "stop" lines but was omitted from the "abandon" line.
3090
3091 PH/34 Omit spaces between a header name and the colon in the error message that
3092       is given when verify = headers_syntax fails (if there are lots of them,
3093       the message gets confusing).
3094
3095 PH/35 Change the default for dns_check_names_pattern to allow slashes within
3096       names, as there are now some PTR records that contain slashes. This check
3097       is only to protect against broken name servers that fall over on strange
3098       characters, so the fact that it applies to all lookups doesn't matter.
3099
3100 PH/36 Now that the new test suite is complete, we can remove some of the
3101       special code in Exim that was needed for the old test suite. For example,
3102       sorting DNS records because real resolvers return them in an arbitrary
3103       order. The new test suite's fake resolver always returns records in the
3104       same order.
3105
3106 PH/37 When running in the test harness, use -odi for submitted messages (e.g.
3107       bounces) except when queue_only is set, to avoid logging races between
3108       the different processes.
3109
3110 PH/38 Panic-die if .include specifies a non-absolute path.
3111
3112 PH/39 A tweak to the "H" retry rule from its user.
3113
3114 JJ/03 exipick: Removed parentheses from 'next' and 'last' calls that specified
3115       a label.  They prevented compilation on older perls.
3116
3117 JJ/04 exipick: Refactored code to prevent implicit split to @_ which caused
3118       a warning to be raised on newish perls.
3119
3120 JJ/05 exipick: Fixed bug where -bpc always showed a count of all messages
3121       on queue.  Changes to match documented behaviour of showing count of
3122       messages matching specified criteria.
3123
3124 PH/40 Changed the default ident timeout from 30s to 5s.
3125
3126 PH/41 Added support for the use of login_cap features, on those BSD systems
3127       that have them, for controlling the resources used by pipe deliveries.
3128
3129 PH/42 The content-scanning code uses fopen() to create files in which to put
3130       message data. Previously it was not paying any attention to the mode of
3131       the files. Exim runs with umask(0) because the rest of the code creates
3132       files with open(), and sets the required mode explicitly. Thus, these
3133       files were ending up world-writeable. This was not a big issue, because,
3134       being within the spool directory, they were not world-accessible. I have
3135       created a function called modefopen, which takes an additional mode
3136       argument. It sets umask(777), creates the file, chmods it to the required
3137       mode, then resets the umask. All the relevant calls to fopen() in the
3138       content scanning code have been changed to use this function.
3139
3140 PH/43 If retry_interval_max is set greater than 24 hours, it is quietly reset
3141       to 24 hours. This avoids potential overflow problems when processing G
3142       and H retry rules. I suspect nobody ever tinkers with this value.
3143
3144 PH/44 Added STRIP_COMMAND=/usr/bin/strip to the FreeBSD Makefile.
3145
3146 PH/45 When the plaintext authenticator is running as a client, the server's
3147       challenges are checked to ensure they are valid base64 strings. By
3148       default, the authentication attempt is cancelled if an invalid string is
3149       received. Setting client_ignore_invalid_base64 true ignores these errors.
3150       The decoded challenge strings are now placed in $auth1, $auth2, etc. as
3151       they are received. Thus, the responses can be made to depend on the
3152       challenges. If an invalid string is ignored, an empty string is placed in
3153       the variable.
3154
3155 PH/46 Messages that are created by the autoreply transport now contains a
3156       References: header, in accordance with RFCs 2822 and 3834.
3157
3158 PH/47 Added authenticated_sender_force to the smtp transport.
3159
3160 PH/48 The ${prvs expansion was broken on systems where time_t was long long.
3161
3162 PH/49 Installed latest patch from the Sieve maintainer.
3163
3164 PH/50 When an Exim quota was set without a file count quota, and mailbox_size
3165       was also set, the appendfile transport was unnecessarily scanning a
3166       directory of message files (e.g. for maildir delivery) to find the count
3167       of files (along with the size), even though it did not need this
3168       information. It now does the scan only if it needs to find either the
3169       size of the count of files.
3170
3171 PH/51 Added ${time_eval: to convert Exim time strings into seconds.
3172
3173 PH/52 Two bugs concerned with error handling when the smtp transport is
3174       used in LMTP mode:
3175
3176       (i) Exim was not creating retry information for temporary errors given
3177       for individual recipients after the DATA command when the smtp transport
3178       was used in LMTP mode. This meant that they could be retried too
3179       frequently, and not timed out correctly.
3180
3181       (ii) Exim was setting the flag that allows error details to be returned
3182       for LMTP errors on RCPT commands, but not for LMTP errors for individual
3183       recipients that were returned after the DATA command.
3184
3185 PH/53 This is related to PH/52, but is more general: for any failing address,
3186       when detailed error information was permitted to be returned to the
3187       sender, but the error was temporary, then after the final timeout, only
3188       "retry timeout exceeded" was returned. Now it returns the full error as
3189       well as "retry timeout exceeded".
3190
3191 PH/54 Added control=allow_auth_unadvertised, as it seems there are clients that
3192       do this, and (what is worse) MTAs that accept it.
3193
3194 PH/55 Added the add_header modified to ACLs. The use of "message" with "warn"
3195       will now be deprecated.
3196
3197 PH/56 New os.c-cygwin from the Cygwin maintainer.
3198
3199 JJ/06 exipick: added --unsorted option to allow unsorted output in all output
3200       formats (previously only available in exim formats via -bpr, -bpru,
3201       and -bpra.  Now also available in native and exiqgrep formats)
3202
3203 JJ/07 exipick: added --freeze and --thaw options to allow faster interaction
3204       with very large, slow to parse queues
3205
3206 JJ/08 exipick: added ! as generic prefix to negate any criteria format
3207
3208 JJ/09 exipick: miscellaneous performance enhancements (~24% improvements)
3209
3210 PH/57 Tidies in SMTP dialogue display in debug output: (i) It was not showing
3211       responses to authentication challenges, though it was showing the
3212       challenges; (ii) I've removed the CR characters from the debug output for
3213       SMTP output lines.
3214
3215 PH/58 Allow for the insertion of a newline as well as a space when a string
3216       is turned into more than one encoded-word during RFC 2047 encoding. The
3217       Sieve code now uses this.
3218
3219 PH/59 Added the following errors that can be detected in retry rules: mail_4xx,
3220       data_4xx, lost_connection, tls_required.
3221
3222 PH/60 When a VRFY deferred or FAILED, the log message rather than the user
3223       message was being sent as an SMTP response.
3224
3225 PH/61 Add -l and -k options to exicyclog.
3226
3227 PH/62 When verifying, if an address was redirected to one new address, so that
3228       verification continued, and the new address failed or deferred after
3229       having set something in $address_data, the value of $address_data was not
3230       passed back to the ACL. This was different to the case when no
3231       redirection occurred. The value is now passed back in both cases.
3232
3233 PH/63 Changed the macro HAVE_LOGIN_CAP (see PH/41 for this release above) to
3234       HAVE_SETCLASSRESOURCES because there are different APIs in use that all
3235       use login_cap.h, so on its own it isn't the distinguishing feature. The
3236       new name refers directly to the setclassresources() function.
3237
3238 PH/65 Added configuration files for NetBSD3.
3239
3240 PH/66 Updated OS/Makefile-HP-UX for gcc 4.1.0 with HP-UX 11.
3241
3242 PH/67 Fixed minor infelicity in the sorting of addresses to ensure that IPv6
3243       is preferred over IPv4.
3244
3245 PH/68 The bounce_return_message and bounce_return_body options were not being
3246       honoured for bounces generated during the reception of non-SMTP messages.
3247       In particular, this applied to messages rejected by the ACL. This bug has
3248       been fixed. However, if bounce_return_message is true and bounce_return_
3249       body is false, the headers that are returned for a non-SMTP message
3250       include only those that have been read before the error was detected.
3251       (In the case of an ACL rejection, they have all been read.)
3252
3253 PH/69 The HTML version of the specification is now built in a directory called
3254       spec_html instead of spec.html, because the latter looks like a path with
3255       a MIME-type, and this confuses some software.
3256
3257 PH/70 Catch two compiler warnings in sieve.c.
3258
3259 PH/71 Fixed an obscure and subtle bug (thanks Alexander & Matthias). The
3260       function verify_get_ident() calls ip_connect() to connect a socket, but
3261       if the "connect()" function timed out, ip_connect() used to close the
3262       socket. However, verify_get_ident() also closes the socket later, and in
3263       between Exim writes to the log, which may get opened at this point. When
3264       the socket was closed in ip_connect(), the log could get the same file
3265       descriptor number as the socket. This naturally causes chaos. The fix is
3266       not to close the socket in ip_connect(); the socket should be closed by
3267       the function that creates it. There was only one place in the code where
3268       this was missing, in the iplookup router, which I don't think anybody now
3269       uses, but I've fixed it anyway.
3270
3271 PH/72 Make dns_again_means_nonexist apply to lookups using gethostbyname() as
3272       well as to direct DNS lookups. Otherwise the handling of names in host
3273       lists is inconsistent and therefore confusing.
3274
3275
3276 Exim version 4.60
3277 -----------------
3278
3279 PH/01 Two changes to the default runtime configuration:
3280
3281       (1) Move the checks for relay_from_hosts and authenticated clients from
3282           after to before the (commented out) DNS black list checks.
3283
3284       (2) Add control=submission to the relay_from_hosts and authenticated
3285           clients checks, on the grounds that messages accepted by these
3286           statements are most likely to be submissions.
3287
3288 PH/02 Several tidies to the handling of ${prvs and ${prvscheck:
3289
3290       (1) Generate an error if the third argument for the ${prvs expansion is
3291           not a single digit.
3292
3293       (2) Treat a missing third argument of ${prvscheck as if it were an empty
3294           string.
3295
3296       (3) Reset the variables that are obtained from the first argument of
3297           ${prvscheck and used in the second argument before leaving the code,
3298           because their memory is reclaimed, so using them afterwards may do
3299           silly things.
3300
3301       (4) Tidy up the code for expanding the arguments of ${prvscheck one by
3302           one (it's much easier than Tom thought :-).
3303
3304       (5) Because of (4), we can now allow for the use of $prvscheck_result
3305           inside the third argument.
3306
3307 PH/03 For some reason, the default setting of PATH when running a command from
3308       a pipe transport was just "/usr/bin". I have changed it to
3309       "/bin:/usr/bin".
3310
3311 PH/04 SUPPORT_TRANSLATE_IP_ADDRESS and MOVE_FROZEN_MESSAGES did not cause
3312       anything to be listed in the output from -bV.
3313
3314 PH/05 When a filter generated an autoreply, the entire To: header line was
3315       quoted in the delivery log line, like this:
3316
3317         => >A.N.Other <ano@some.domain> <original@ddress> ...
3318
3319       This has been changed so that it extracts the operative address. There
3320       may be more than one such address. If so, they are comma-separated, like
3321       this:
3322
3323         => >ano@some.domain,ona@other.domain <original@ddress> ...
3324
3325 PH/06 When a client host used a correct literal IP address in a HELO or EHLO
3326       command, (for example, EHLO [1.2.3.4]) and the client's IP address was
3327       not being looked up in the rDNS to get a host name, Exim was showing the
3328       IP address twice in Received: lines, even though the IP addresses were
3329       identical. For example:
3330
3331         Received: from [1.2.3.4] (helo=[1.2.3.4])
3332
3333       However, if the real host name was known, it was omitting the HELO data
3334       if it matched the actual IP address. This has been tidied up so that it
3335       doesn't show the same IP address twice.
3336
3337 PH/07 When both +timestamp and +memory debugging was on, the value given by
3338       $tod_xxx expansions could be wrong, because the tod_stamp() function was
3339       called by the debug printing, thereby overwriting the timestamp buffer.
3340       Debugging no longer uses the tod_stamp() function when +timestamp is set.
3341
3342 PH/08 When the original message was included in an autoreply transport, it
3343       always said "this is a copy of the message, including all the headers",
3344       even if body_only or headers_only was set. It now gives an appropriate
3345       message.
3346
3347 PH/09 Applied a patch from the Sieve maintainer which:
3348
3349       o  fixes some comments
3350       o  adds the (disabled) notify extension core
3351       o  adds some debug output for the result of if/elsif tests
3352       o  points to the current vacation draft in the documentation
3353          and documents the missing references header update
3354
3355       and most important:
3356
3357       o  fixes a bug in processing the envelope test (when testing
3358          multiple envelope elements, the last element determined the
3359          result)
3360
3361 PH/10 Exim was violating RFC 3834 ("Recommendations for Automatic Responses to
3362       Electronic Mail") by including:
3363
3364         Auto-submitted: auto-generated
3365
3366       in the messages that it generates (bounce messages and others, such as
3367       warnings). In the case of bounce messages for non-SMTP messages, there was
3368       also a typo: it was using "Auto_submitted" (underscore instead of
3369       hyphen). Since every message generated by Exim is necessarily in response
3370       to another message, thes have all been changed to:
3371
3372         Auto-Submitted: auto-replied
3373
3374       in accordance with these statements in the RFC:
3375
3376         The auto-replied keyword:
3377
3378         -  SHOULD be used on messages sent in direct response to another
3379            message by an automatic process,
3380
3381         -  MUST NOT be used on manually-generated messages,
3382
3383         -  MAY be used on Delivery Status Notifications (DSNs) and Message
3384            Disposition Notifications (MDNs),
3385
3386         -  MUST NOT be used on messages generated by automatic or periodic
3387            processes, except for messages which are automatic responses to
3388            other messages.
3389
3390 PH/11 Added "${if def:sender_address {(envelope-from <$sender_address>)\n\t}}"
3391       to the default Received: header definition.
3392
3393 PH/12 Added log selector acl_warn_skipped (default on).
3394
3395 PH/13 After a successful wildlsearch lookup, discard the values of numeric
3396       variables because (a) they are in the wrong storage pool and (b) even if
3397       they were copied, it wouldn't work properly because of the caching.
3398
3399 PH/14 Add check_rfc2047_length to disable enforcement of RFC 2047 length
3400       checking when decoding. Apparently there are clients that generate
3401       overlong encoded strings. Why am I not surprised?
3402
3403 PH/15 If the first argument of "${if match_address" was not empty, but did not
3404       contain an "@" character, Exim crashed. Now it writes a panic log message
3405       and treats the condition as false.
3406
3407 PH/16 In autoreply, treat an empty string for "once" the same as unset.
3408
3409 PH/17 A further patch from the Sieve maintainer: "Introduce the new Sieve
3410       extension "envelope-auth".  The code is finished and in agreement with
3411       other implementations, but there is no documentation so far and in fact,
3412       nobody wrote the draft yet.  This extension is currently #undef'ed, thus
3413       not changing the active code.
3414
3415       Print executed "if" and "elsif" statements when debugging is used. This
3416       helps a great deal to understand what a filter does.
3417
3418       Document more things not specified clearly in RFC3028.  I had all this
3419       sorted out, when out of a sudden new issues came to my mind.  Oops."
3420
3421 PH/18 Exim was not recognizing the "net-" search type prefix in match_ip lists
3422       (Bugzilla #53).
3423
3424 PH/19 Exim expands the IPv6 address given to -bh to its full non-abbreviated
3425       canonical form (as documented). However, after a host name lookup from
3426       the IP address, check_host() was doing a simple string comparison with
3427       addresses acquired from the DNS when checking that the found name did
3428       have the original IP as one of its addresses. Since any found IPv6
3429       addresses are likely to be in abbreviated form, the comparison could
3430       fail. Luckily, there already exists a function for doing the comparison
3431       by converting both addresses to binary, so now that is used instead of
3432       the text comparison.
3433
3434 PH/20 There was another similar case to PH/19, when a complete host name was
3435       given in a host list; looking up its IP address could give an abbreviated
3436       form, whereas the current host's name might or might not be abbreviated.
3437       The same fix has been applied.
3438
3439
3440 Exim version 4.54
3441 -----------------
3442
3443 PH/01 The ${base62: operator adjusted itself to base 36 when BASE_62 was
3444       set to 36 (for Darwin and Cygwin), but the ${base62d: operator did not.
3445       It now does.
3446
3447 PH/02 Two minor problems detected in Cygwin: the os.{c,h} files had lost */ on
3448       the CVS lines, and there was a missing #if HAVE_IPV6 in host.c.
3449
3450 PH/03 Typo: missing ".o" in src/pcre/Makefile.
3451
3452 PH/04 Tighten up "personal" tests: Instead of testing for any "List-"
3453       header line, restrict the check to what is listed in RFCs 2369 and 2929.
3454       Also, for "Auto-Submitted", treat anything other than "no" as
3455       non-personal, in accordance with RFC 3834. (Previously it treated
3456       anything starting "auto-" as non-personal.)
3457
3458 TF/01 The control=submission/name=... option had a problem with syntax
3459       errors if the name included a slash character. The /name= option
3460       now slurps the rest of the string, so it can include any characters
3461       but it must come last in the list of options (after /sender_retain
3462       or /domain=).
3463
3464 PH/05 Some modifications to the interface to the fake nameserver for the new
3465       testing suite.
3466
3467
3468
3469 Exim version 4.53
3470 -----------------
3471
3472 TK/01 Added the "success_on_redirect" address verification option. See
3473       NewStuff for rationale and an example.
3474
3475 PH/01 Added support for SQLite, basic code supplied by David Woodhouse.
3476
3477 PH/02 Patch to exigrep to allow it to work on syslog lines.
3478
3479 PH/03 When creating an mbox file for a virus/spam scan, use fseek() instead of
3480       fread() to skip over the body file's header line, because in Cygwin the
3481       header line is locked and is inaccessible.
3482
3483 PH/04 Added $message_exim_id, ultimately to replace $message_id (they will both
3484       co-exist for some time) to make it clear that it is the Exim ID that is
3485       referenced, not the Message-ID: header line.
3486
3487 PH/05 Replaced all Tom's calls to snprintf() with calls to the internal
3488       string_format() function, because snprintf() does not exist on all
3489       operating systems.
3490
3491 PH/06 The use of forbid_filter_existstest now also locks out the use of the
3492       ${stat: expansion item.
3493
3494 PH/07 Changed "SMTP protocol violation: synchronization error" into "SMTP
3495       protocol synchronization error", to keep the pedants happy.
3496
3497 PH/08 Arrange for USE_INET_NTOA_FIX to be set in config.h for AIX systems as
3498       well as for IRIX systems, when gcc is being used. See the host.c source
3499       file for comments.
3500
3501 PH/09 Installed latest Cygwin configuration files from the Cygwin maintainer.
3502
3503 PH/10 Named domain lists were not working if used in a queue_smtp_domains
3504       setting.
3505
3506 PH/11 Added support for the IGNOREQUOTA extension to LMTP, both to the lmtp
3507       transport and to the smtp transport in LMTP mode.
3508
3509 TK/02 Remove one case of BASE64 error detection FTTB (undocumented anyway).
3510
3511 PH/12 There was a missing call to search_tidyup() before the fork() in rda.c to
3512       run a filter in a subprocess. This could lead to confusion in subsequent
3513       lookups in the parent process. There should also be a search_tidyup() at
3514       the end of the subprocess.
3515
3516 PH/13 Previously, if "verify = helo" was set in an ACL, the condition was true
3517       only if the host matched helo_try_verify_hosts, which caused the
3518       verification to occur when the EHLO/HELO command was issued. The ACL just
3519       tested the remembered result. Now, if a previous verification attempt has
3520       not happened, "verify = helo" does it there and then.
3521
3522 JJ/01 exipick: added $message_exim_id variable (see 4.53-PH/04)
3523
3524 TK/03 Fix log output including CR from clamd.
3525
3526 PH/14 A reference to $reply_address when Reply-to: was empty and From: did not
3527       exist provoked a memory error which could cause a segfault.
3528
3529 PH/15 Installed PCRE 6.2
3530
3531 PH/17 Defined BIND_8_COMPAT in the Darwin os.h file.
3532
3533 PH/18 Reversed 4.52/PH/17 because the HP-UX user found it wasn't the cause
3534       of the problem. Specifically, suggested +O2 rather than +O1 for the
3535       HP-UX compiler.
3536
3537 PH/19 Added sqlite_lock_timeout option (David Woodhouse's patch).
3538
3539 PH/20 If a delivery was routed to a non-standard port by means of an SRV
3540       record, the port was not correctly logged when the outgoing_port log
3541       selector was set (it logged the transort's default port).
3542
3543 PH/21 Added support for host-specific ports to manualroute, queryprogram,
3544       fallback_hosts, and "hosts" in the smtp transport.
3545
3546 PH/22 If the log selector "outgoing_port" is set, the port is now also given on
3547       host errors such as "Connection refused".
3548
3549 PH/23 Applied a patch to fix problems with exim-4.52 while doing radius
3550       authentication with radiusclient 0.4.9:
3551
3552       - Error returned from rc_read_config was caught wrongly
3553       - Username/password not passed on to radius server due to wrong length.
3554
3555       The presumption is that some radiusclient API changes for 4.51/PH/17
3556       were not taken care of correctly. The code is still untested by me (my
3557       Linux distribution still has 0.3.2 of radiusclient), but it was
3558       contributed by a Radius user.
3559
3560 PH/24 When doing a callout, the value of $domain wasn't set correctly when
3561       expanding the "port" option of the smtp transport.
3562
3563 TK/04 MIME ACL: Fix buffer underrun that occurs when EOF condition is met
3564       while reading a MIME header. Thanks to Tom Hughes for a patch.
3565
3566 PH/24 Include config.h inside local_scan.h so that configuration settings are
3567       available.
3568
3569 PH/25 Make $smtp_command_argument available after all SMTP commands. This means
3570       that in an ACL for RCPT (for example), you can examine exactly what was
3571       received.
3572
3573 PH/26 Exim was recognizing IPv6 addresses of the form [IPv6:....] in EHLO
3574       commands, but it was not correctly comparing the address with the actual
3575       client host address. Thus, it would show the EHLO address in Received:
3576       header lines when this was not necessary.
3577
3578 PH/27 Added the % operator to ${eval:}.
3579
3580 PH/28 Exim tries to create and chdir to its spool directory when it starts;
3581       it should be ignoring failures (because with -C, for example, it has lost
3582       privilege). It wasn't ignoring creation failures other than "already
3583       exists".
3584
3585 PH/29 Added "crypteq" to the list of supported features that Exim outputs when
3586       -bV or -d is used.
3587
3588 PH/30 Fixed (presumably very longstanding) bug in exim_dbmbuild: if it failed
3589       because an input line was too long, either on its own, or by virtue of
3590       too many continuations, the temporary file was not being removed, and the
3591       return code was incorrect.
3592
3593 PH/31 Missing "BOOL" in function definition in filtertest.c.
3594
3595 PH/32 Applied Sieve patches from the maintainer.
3596
3597 TK/05 Domainkeys: Accomodate for a minor API change in libdomainkeys 0.67.
3598
3599 PH/33 Added "verify = not_blind".
3600
3601 PH/34 There are settings for CHOWN_COMMAND and MV_COMMAND that can be used in
3602       Local/Makefile (with some defaults set). These are used in built scripts
3603       such as exicyclog, but they have never been used in the exim_install
3604       script (though there are many overriding facilities there). I have
3605       arranged that the exim_install script now takes note of these two
3606       settings.
3607
3608 PH/35 Installed configuration files for Dragonfly.
3609
3610 PH/36 When a locally submitted message by a trusted user did not contain a
3611       From: header, and the sender address was obtained from -f or from an SMTP
3612       MAIL command, and the trusted user did not use -F to supply a sender
3613       name, $originator_name was incorrectly used when constructing a From:
3614       header. Furthermore, $originator_name was used for submission mode
3615       messages from external hosts without From: headers in a similar way,
3616       which is clearly wrong.
3617
3618 PH/37 Added control=suppress_local_fixups.
3619
3620 PH/38 When log_selector = +received_sender was set, and the addition of the
3621       sender made the log line's construction buffer exactly full, or one byte
3622       less than full, an overflow happened when the terminating "\n" was
3623       subsequently added.
3624
3625 PH/39 Added a new log selector, "unknown_in_list", which provokes a log entry
3626       when the result of a list match is failure because a DNS lookup failed.
3627
3628 PH/40 RM_COMMAND is now used in the building process.
3629
3630 PH/41 Added a "distclean" target to the top-level Makefile; it deletes all
3631       the "build-* directories that it finds.
3632
3633 PH/42 (But a TF fix): In a domain list, Exim incorrectly matched @[] if the IP
3634       address in a domain literal was a prefix of an interface address.
3635
3636 PH/43 (Again a TF fix): In the dnslookup router, do not apply widen_domains
3637       when verifying a sender address, unless rewrite_headers is false.
3638
3639 PH/44 Wrote a long comment about why errors_to addresses are verified as
3640       recipients, not senders.
3641
3642 TF/01 Add missing LIBS=-lm to OS/Makefile-OpenBSD which was overlooked when
3643       the ratelimit ACL was added.
3644
3645 PH/45 Added $smtp_command for the full command (cf $smtp_command_argument).
3646
3647 PH/46 Added extra information about PostgreSQL errors to the error string.
3648
3649 PH/47 Added an interface to a fake DNS resolver for use by the new test suite,
3650       avoiding the need to install special zones in a real server. This is
3651       backwards compatible; if it can't find the fake resolver, it drops back.
3652       Thus, both old and new test suites can be run.
3653
3654 TF/02 Added util/ratelimit.pl
3655
3656 TF/03 Minor fix to the ratelimit code to improve its behaviour in case the
3657       clock is set back in time.
3658
3659 TF/04 Fix the ratelimit support in exim_fixdb. Patch provided by Brian
3660       Candler <B.Candler@pobox.com>.
3661
3662 TF/05 The fix for PH/43 was not completely correct; widen_domains is always
3663       OK for addresses that are the result of redirections.
3664
3665 PH/48 A number of further additions for the benefit of the new test suite,
3666       including a fake gethostbyname() that interfaces to the fake DNS resolver
3667       (see PH/47 above).
3668
3669 TF/06 The fix for widen_domains has also been applied to qualify_single and
3670       search_parents which are the other dnslookup options that can cause
3671       header rewrites.
3672
3673 PH/49 Michael Haardt's randomized retrying, but as a separate retry parameter
3674       type ("H").
3675
3676 PH/50 Make never_users, trusted_users, admin_groups, trusted_groups expandable.
3677
3678 TF/07 Exim produced the error message "an SRV record indicated no SMTP
3679       service" if it encountered an MX record with an empty target hostname.
3680       The message is now "an MX or SRV record indicated no SMTP service".
3681
3682 TF/08 Change PH/13 introduced the possibility that verify=helo may defer,
3683       if the DNS of the sending site is misconfigured. This is quite a
3684       common situation. This change restores the behaviour of treating a
3685       helo verification defer as a failure.
3686
3687 PH/51 If self=fail was set on a router, the bounce message did not include the
3688       actual error message.
3689
3690
3691 Exim version 4.52
3692 -----------------
3693
3694 TF/01 Added support for Client SMTP Authorization. See NewStuff for details.
3695
3696 PH/01 When a transport filter timed out in a pipe delivery, and the pipe
3697       command itself ended in error, the underlying message about the transport
3698       filter timeout was being overwritten with the pipe command error. Now the
3699       underlying error message should be appended to the second error message.
3700
3701 TK/01 Fix poll() being unavailable on Mac OSX 10.2.
3702
3703 PH/02 Reduce the amount of output that "make" produces by default. Full output
3704       can still be requested.
3705
3706 PH/03 The warning log line about a condition test deferring for a "warn" verb
3707       was being output only once per connection, rather than after each
3708       occurrence (because it was using the same function as for successful
3709       "warn" verbs). This seems wrong, so I have changed it.
3710
3711 TF/02 Two buglets in acl.c which caused Exim to read a few bytes of memory that
3712       it should not have, which might have caused a crash in the right
3713       circumstances, but probably never did.
3714
3715 PH/04 Installed a modified version of Tony Finch's patch to make submission
3716       mode fix the return path as well as the Sender: header line, and to
3717       add a /name= option so that you can make the user's friendly name appear
3718       in the header line.
3719
3720 TF/03 Added the control = fakedefer ACL modifier.
3721
3722 TF/04 Added the ratelimit ACL condition. See NewStuff for details. Thanks to
3723       Mark Lowes for thorough testing.
3724
3725 TK/02 Rewrote SPF support to work with libspf2 versions >1.2.0.
3726
3727 TK/03 Merged latest SRS patch from Miles Wilton.
3728
3729 PH/05 There's a shambles in IRIX6 - it defines EX_OK in unistd.h which conflicts
3730       with the definition in sysexits.h (which is #included earlier).
3731       Fortunately, Exim does not actually use EX_OK. The code used to try to
3732       preserve the sysexits.h value, by assuming that macro definitions were
3733       scanned for macro replacements. I have been disabused of this notion,
3734       so now the code just undefines EX_OK before #including unistd.h.
3735
3736 PH/06 There is a timeout for writing blocks of data, set by, e.g. data_timeout
3737       in the smtp transport. When a block could not be written in a single
3738       write() function, the timeout was being re-applied to each part-write.
3739       This seems wrong - if the receiver was accepting one byte at a time it
3740       would take for ever. The timeout is now adjusted when this happens. It
3741       doesn't have to be particularly precise.
3742
3743 TK/04 Added simple SPF lookup method in EXPERIMENTAL_SPF. See NewStuff for
3744       details. Thanks to Chris Webb <chris@arachsys.com> for the patch!
3745
3746 PH/07 Added "fullpostmaster" verify option, which does a check to <postmaster>
3747       without a domain if the check to <postmaster@domain> fails.
3748
3749 SC/01 Eximstats: added -xls and the ability to specify output files
3750      (patch written by Frank Heydlauf).
3751
3752 SC/02 Eximstats: use FileHandles for outputting results.
3753
3754 SC/03 Eximstats: allow any combination of xls, txt, and html output.
3755
3756 SC/04 Eximstats: fixed display of large numbers with -nvr option
3757
3758 SC/05 Eximstats: fixed merging of reports with empty tables.
3759
3760 SC/06 Eximstats: added the -include_original_destination flag
3761
3762 SC/07 Eximstats: removed tabs and trailing whitespace.
3763
3764 TK/05 Malware: Improve on aveserver error handling. Patch from Alex Miller.
3765
3766 TK/06 MBOX spool code: Add real "From " MBOX separator line
3767       so the .eml file is really in mbox format (even though
3768       most programs do not really care). Patch from Alex Miller.
3769
3770 TK/07 MBOX spool code: Add X-Envelope-From: and X-Envelope-To: headers.
3771       The latter is generated from $received_to and is only set if the
3772       message has one envelope recipient. SA can use these headers,
3773       obviously out-of-the-box. Patch from Alex Miller.
3774
3775 PH/08 The ${def test on a variable was returning false if the variable's
3776       value was "0", contrary to what the specification has always said!
3777       The result should be true unless the variable is empty.
3778
3779 PH/09 The syntax error of a character other than { following "${if
3780       def:variable_name" (after optional whitespace) was not being diagnosed.
3781       An expansion such as ${if def:sender_ident:{xxx}{yyy}} in which an
3782       accidental colon was present, for example, could give incorrect results.
3783
3784 PH/10 Tidied the code in a number of places where the st_size field of a stat()
3785       result is used (not including appendfile, where other changes are about
3786       to be made).
3787
3788 PH/11 Upgraded appendfile so that quotas larger than 2G are now supported.
3789       This involved changing a lot of size variables from int to off_t. It
3790       should work with maildirs and everything.
3791
3792 TK/08 Apply fix provided by Michael Haardt to prevent deadlock in case of
3793       spamd dying while we are connected to it.
3794
3795 TF/05 Fixed a ${extract error message typo reported by Jeremy Harris
3796       <jgh@wizmail.org>
3797
3798 PH/12 Applied Alex Kiernan's patch for the API change for the error callback
3799       function for BDB 4.3.
3800
3801 PH/13 Changed auto_thaw such that it does not apply to bounce messages.
3802
3803 PH/14 Imported PCRE 6.0; this was more than just a trivial operation because
3804       the sources for PCRE have been re-arranged and more files are now
3805       involved.
3806
3807 PH/15 The code I had for printing potentially long long variables in PH/11
3808       above was not the best (it lost precision). The length of off_t variables
3809       is now inspected at build time, and an appropriate printing format (%ld
3810       or %lld) is chosen and #defined by OFF_T_FMT. We also define LONGLONG_T
3811       to be "long long int" or "long int". This is needed for the internal
3812       formatting function string_vformat().
3813
3814 PH/16 Applied Matthew Newton's patch to exicyclog: "If log_file_path is set in
3815       the configuration file to be ":syslog", then the script "guesses" where
3816       the logs files are, rather than using the compiled in default. In our
3817       case the guess is not the same as the compiled default, so the script
3818       suddenly stopped working when I started to use syslog. The patch checks
3819       to see if log_file_path is "". If so, it attempts to read it from exim
3820       with no configuration file to get the compiled in version, before it
3821       falls back to the previous guessing code."
3822
3823 TK/09 Added "prvs" and "prvscheck" expansion items. These help a lot with
3824       implementing BATV in an Exim configuration. See NewStuff for the gory
3825       details.
3826
3827 PH/17 Applied Michael Haardt's patch for HP-UX, affecting only the os.h and
3828       Makefile that are specific to HP-UX.
3829
3830 PH/18 If the "use_postmaster" option was set for a recipient callout together
3831       with the "random" option, the postmaster address was used as the MAIL
3832       FROM address for the random test, but not for the subsequent recipient
3833       test. It is now used for both.
3834
3835 PH/19 Applied Michael Haardt's patch to update Sieve to RFC3028bis. "The
3836       patch removes a few documentation additions to RFC 3028, because the
3837       latest draft now contains them. It adds the new en;ascii-case comparator
3838       and a new error check for 8bit text in MIME parts. Comparator and
3839       require names are now matched exactly. I enabled the subaddress
3840       extension, but it is not well tested yet (read: it works for me)."
3841
3842 PH/20 Added macros for time_t as for off_t (see PH/15 above) and used them to
3843       rework some of the code of TK/09 above to avoid the hardwired use of
3844       "%lld" and "long long". Replaced the call to snprintf() with a call to
3845       string_vformat().
3846
3847 PH/21 Added some other messages to those in 4.51/PH/42, namely "All relevant MX
3848       records point to non-existent hosts", "retry timeout exceeded", and
3849       "retry time not reached for any host after a long failure period".
3850
3851 PH/22 Fixed some oversights/typos causing bugs when Exim is compiled with
3852       experimental DomainKeys support:
3853
3854       (1) The filter variables $n0-$n9 and $sn0-$sn9 were broken.
3855       (2) On an error such as an illegally used "control", the wrong name for
3856           the control was given.
3857
3858       These problems did NOT occur unless DomainKeys support was compiled.
3859
3860 PH/23 Added daemon_startup_retries and daemon_startup_sleep.
3861
3862 PH/24 Added ${if match_ip condition.
3863
3864 PH/25 Put debug statements on either side of calls to EXIM_DBOPEN() for hints
3865       databases so that it will be absolutely obvious if a crash occurs in the
3866       DB library. This is a regular occurrence (often caused by mis-matched
3867       db.h files).
3868
3869 PH/26 Insert a lot of missing (void) casts for functions such as chown(),
3870       chmod(), fcntl(), sscanf(), and other functions from stdio.h. These were
3871       picked up on a user's system that detects such things. There doesn't seem
3872       to be a gcc warning option for this - only an attribute that has to be
3873       put on the function's prototype. It seems that in Fedora Core 4 they have
3874       set this on a number of new functions. No doubt there will be more in due
3875       course.
3876
3877 PH/27 If a dnslookup or manualroute router is set with verify=only, it need not
3878       specify a transport. However, if an address that was verified by such a
3879       router was the subject of a callout, Exim crashed because it tried to
3880       read the rcpt_include_affixes from the non-existent transport. Now it
3881       just assumes that the setting of that option is false. This bug was
3882       introduced by 4.51/PH/31.
3883
3884 PH/28 Changed -d+all to exclude +memory, because that information is very
3885       rarely of interest, but it makes the output a lot bigger. People tend to
3886       do -d+all out of habit.
3887
3888 PH/29 Removed support for the Linux-libc5 build, as it is obsolete and the
3889       code in os-type was giving problems when libc.so lives in lib64, like on
3890       x86_64 Fedora Core.
3891
3892 PH/30 Exim's DNS code uses the original T_xxx names for DNS record times. These
3893       aren't the modern standard, and it seems that some systems' include files
3894       don't always have them. Exim was already checking for some of the newer
3895       ones like T_AAAA, and defining it itself. I've added checks for all the
3896       record types that Exim uses.
3897
3898 PH/31 When using GnuTLS, if the parameters cache file did not exist, Exim was
3899       not automatically generating a new one, as it is supposed to. This
3900       prevented TLS from working. If the file did exist, but contained invalid
3901       data, a new version was generated, as expected. It was only the case of a
3902       non-existent file that was broken.
3903
3904 TK/10 Domainkeys: Fix a bug in verification that caused a crash in conjunction
3905       with a change in libdomainkeys > 0.64.
3906
3907 TK/11 Domainkeys: Change the logic how the "testing" policy flag is retrieved
3908       from DNS. If the selector record carries the flag, it now has
3909       precedence over the domain-wide flag.
3910
3911 TK/12 Cleared some compiler warnings related to SPF, SRS and DK code.
3912
3913 PH/32 In mua_wrapper mode, if an smtp transport configuration error (such as
3914       the use of a port name that isn't defined in /etc/services) occurred, the
3915       message was deferred as in a normal delivery, and thus remained on the
3916       spool, instead of being failed because of the mua_wrapper setting. This
3917       is now fixed, and I tidied up some of the mua_wrapper messages at the
3918       same time.
3919
3920 SC/08 Eximstats: whilst parsing the mainlog(s), store information about
3921       the messages in a hash of arrays rather than using individual hashes.
3922       This is a bit cleaner and results in dramatic memory savings, albeit
3923       at a slight CPU cost.
3924
3925 SC/09 Eximstats: added the -show_rt<list> and the -show_dt<list> flags
3926       as requested by Marc Sherman.
3927
3928 SC/10 Eximstats: added histograms for user specified patterns as requested
3929       by Marc Sherman.
3930
3931 SC/11 Eximstats: v1.43 - bugfix for pattern histograms with -h0 specified.
3932
3933 PH/33 Patch from the Cygwin maintainer to add "b" to all occurences of
3934       fopen() in the content-scanning modules that did not already have it.
3935
3936
3937 Exim version 4.51
3938 -----------------
3939
3940 TK/01 Added Yahoo DomainKeys support via libdomainkeys. See
3941       doc/experimental-spec.txt for details. (http://domainkeys.sf.net)
3942
3943 TK/02 Fix ACL "control" statement not being available in MIME ACL.
3944
3945 TK/03 Fix ACL "regex" condition not being available in MIME ACL.
3946
3947 PH/01 Installed a patch from the Sieve maintainer that allows -bf to be used
3948       to test Sieve filters that use "vacation".
3949
3950 PH/02 Installed a slightly modified version of Nikos Mavrogiannopoulos' patch
3951       that changes the way the GnuTLS parameters are stored in the cache file.
3952       The new format can be generated externally. For backward compatibility,
3953       if the data in the cache doesn't make sense, Exim assumes it has read an
3954       old-format file, and it generates new data and writes a new file. This
3955       means that you can't go back to an older release without removing the
3956       file.
3957
3958 PH/03 A redirect router that has both "unseen" and "one_time" set does not
3959       work if there are any delivery delays because "one_time" forces the
3960       parent to be marked "delivered", so its unseen clone is never tried
3961       again. For this reason, Exim now forbids the simultaneous setting of
3962       these two options.
3963
3964 PH/04 Change 4.11/85 fixed an obscure bug concerned with addresses that are
3965       redirected to themselves ("homonym" addresses). Read the long ChangeLog
3966       entry if you want to know the details. The fix, however, neglected to
3967       consider the case when local delivery batching is involved. The test for
3968       "previously delivered" was not happening when checking to see if an
3969       address could be batched with a previous (undelivered) one; under
3970       certain circumstances this could lead to multiple deliveries to the same
3971       address.
3972
3973 PH/05 Renamed the macro SOCKLEN_T as EXIM_SOCKLEN_T because AIX uses SOCKLEN_T
3974       in its include files, and this causes problems building Exim.
3975
3976 PH/06 A number of "verify =" ACL conditions have no options (e.g. verify =
3977       header_syntax) but Exim was just ignoring anything given after a slash.
3978       In particular, this caused confusion with an attempt to use "verify =
3979       reverse_host_lookup/defer_ok". An error is now given when options are
3980       supplied for verify items that do not have them. (Maybe reverse_host_
3981       lookup should have a defer_ok option, but that's a different point.)
3982
3983 PH/07 Increase the size of the buffer for incoming SMTP commands from 512 (as
3984       defined by RFC 821) to 2048, because there were problems with some AUTH
3985       commands, and RFC 1869 says the size should be increased for extended
3986       SMTP commands that take arguments.
3987
3988 PH/08 Added ${dlfunc dynamically loaded function for expansion (code from Tony
3989       Finch).
3990
3991 PH/09 Previously, an attempt to use ${perl when it wasn't compiled gave an
3992       "unknown" error; now it says that the functionality isn't in the binary.
3993
3994 PH/10 Added a nasty fudge to try to recognize and flatten LDAP passwords in
3995       an address' error message when a string expansion fails (syntax or
3996       whatever). Otherwise the password may appear in the log. Following change
3997       PH/42 below, there is no longer a chance of it appearing in a bounce
3998       message.
3999
4000 PH/11 Installed exipick version 20050225.0 from John Jetmore.
4001
4002 PH/12 If the last host in a fallback_hosts list was multihomed, only the first
4003       of its addresses was ever tried. (Bugzilla bug #2.)
4004
4005 PH/13 If "headers_add" in a transport didn't end in a newline, Exim printed
4006       the result incorrectly in the debug output. (It correctly added a newline
4007       to what was transported.)
4008
4009 TF/01 Added $received_time.
4010
4011 PH/14 Modified the default configuration to add an acl_smtp_data ACL, with
4012       commented out examples of how to interface to a virus scanner and to
4013       SpamAssassin. Also added commented examples of av_scanner and
4014       spamd_address settings.
4015
4016 PH/15 Further to TK/02 and TK/03 above, tidied up the tables of what conditions
4017       and controls are allowed in which ACLs. There were a couple of minor
4018       errors. Some of the entries in the conditions table (which is a table of
4019       where they are NOT allowed) were getting very unwieldy; rewrote them as a
4020       negation of where the condition IS allowed.
4021
4022 PH/16 Installed updated OS/os.c-cygwin from the Cygwin maintainer.
4023
4024 PH/17 The API for radiusclient changed at release 0.4.0. Unfortunately, the
4025       header file does not have a version number, so I've had to invent a new
4026       value for RADIUS_LIB_TYPE, namely "RADIUSCLIENTNEW" to request the new
4027       API. The code is untested by me (my Linux distribution still has 0.3.2 of
4028       radiusclient), but it was contributed by a Radius user.
4029
4030 PH/18 Installed Lars Mainka's patch for the support of CRL collections in
4031       files or directories, for OpenSSL.
4032
4033 PH/19 When an Exim process that is running as root has to create an Exim log
4034       file, it does so in a subprocess that runs as exim:exim so as to get the
4035       ownership right at creation (otherwise, other Exim processes might see
4036       the file with the wrong ownership). There was no test for failure of this
4037       fork() call, which would lead to the process getting stuck as it waited
4038       for a non-existent subprocess. Forks do occasionally fail when resources
4039       run out. I reviewed all the other calls to fork(); they all seem to check
4040       for failure.
4041
4042 PH/20 When checking for unexpected SMTP input at connect time (before writing
4043       the banner), Exim was not dealing correctly with a non-positive return
4044       from the read() function. If the client had disconnected by this time,
4045       the result was a log entry for a synchronization error with an empty
4046       string after "input=" when read() returned zero. If read() returned -1
4047       (an event I could not check), uninitialized data bytes were printed.
4048       There were reports of junk text (parts of files, etc) appearing after
4049       "input=".
4050
4051 PH/21 Added acl_not_smtp_mime to allow for MIME scanning for non-SMTP messages.
4052
4053 PH/22 Added support for macro redefinition, and (re)definition in between
4054       driver and ACL definitions.
4055
4056 PH/23 The cyrus_sasl authenticator was expanding server_hostname, but then
4057       forgetting to use the resulting value; it was using the unexpanded value.
4058
4059 PH/24 The cyrus_sasl authenticator was advertising mechanisms for which it
4060       hadn't been configured. The fix is from Juergen Kreileder, who
4061       understands it better than I do:
4062
4063       "Here's what I see happening with three configured cyrus_sasl
4064       authenticators configured (plain, login, cram-md5):
4065
4066       On startup auth_cyrus_sasl_init() gets called for each of these.
4067       This means three calls to sasl_listmech() without a specified mech_list.
4068       => SASL tests which mechs of all available mechs actually work
4069       => three warnings about OTP not working
4070       => the returned list contains: plain, login, cram-md5, digest-md5, ...
4071
4072       With the patch, sasl_listmech() also gets called three times.  But now
4073       SASL's mech_list option is set to the server_mech specified in the the
4074       authenticator.  Or in other words, the answer from sasl_listmech()
4075       gets limited to just the mech you're testing for (which is different
4076       for each call.)
4077       => the return list contains just 'plain' or 'login', 'cram-md5' or
4078       nothing depending on the value of ob->server_mech.
4079
4080       I've just tested the patch: Authentication still works fine,
4081       unavailable mechs specified in the exim configuration are still
4082       caught, and the auth.log warnings about OTP are gone."
4083
4084 PH/25 When debugging is enabled, the contents of the command line are added
4085       to the debugging output, even when log_selector=+arguments is not
4086       specified.
4087
4088 PH/26 Change scripts/os-type so that when "uname -s" returns just "GNU", the
4089       answer is "GNU", and only if the return is "GNU/something" is the answer
4090       "Linux".
4091
4092 PH/27 $acl_verify_message is now set immediately after the failure of a
4093       verification in an ACL, and so is available in subsequent modifiers. In
4094       particular, the message can be preserved by coding like this:
4095
4096          warn  !verify = sender
4097                set acl_m0 = $acl_verify_message
4098
4099       Previously, $acl_verify_message was set only while expanding "message"
4100       and "log_message" when a very denied access.
4101
4102 PH/28 Modified OS/os.c-Linux with
4103
4104         -#ifndef OS_LOAD_AVERAGE
4105         +#if !defined(OS_LOAD_AVERAGE) && defined(__linux__)
4106
4107       to make Exim compile on kfreebsd-gnu. (I'm totally confused about the
4108       nomenclature these days.)
4109
4110 PH/29 Installed patch from the Sieve maintainer that adds the options
4111       sieve_useraddress and sieve_subaddress to the redirect router.
4112
4113 PH/30 In these circumstances:
4114         . Two addresses routed to the same list of hosts;
4115         . First host does not offer TLS;
4116         . First host accepts first address;
4117         . First host gives temporary error to second address;
4118         . Second host offers TLS and a TLS session is established;
4119         . Second host accepts second address.
4120       Exim incorrectly logged both deliveries with the TLS parameters (cipher
4121       and peerdn, if requested) that were in fact used only for the second
4122       address.
4123
4124 PH/31 When doing a callout as part of verifying an address, Exim was not paying
4125       attention to any local part prefix or suffix that was matched by the
4126       router that accepted the address. It now behaves in the same way as it
4127       does for delivery: the affixes are removed from the local part unless
4128       rcpt_include_affixes is set on the transport.
4129
4130 PH/32 Add the sender address, as F=<...>, to the log line when logging a
4131       timeout during the DATA phase of an incoming message.
4132
4133 PH/33 Sieve envelope tests were broken for match types other than :is. I have
4134       applied a patch sanctioned by the Sieve maintainer.
4135
4136 PH/34 Change 4.50/80 broke Exim in that it could no longer handle cases where
4137       the uid or gid is negative. A case of a negative gid caused this to be
4138       noticed. The fix allows for either to be negative.
4139
4140 PH/35 ACL_WHERE_MIME is now declared unconditionally, to avoid too much code
4141       clutter, but the tables that are indexed by ACL_WHERE_xxx values had been
4142       overlooked.
4143
4144 PH/36 The change PH/12 above was broken. Fixed it.
4145
4146 PH/37 Exim used to check for duplicate addresses in the middle of routing, on
4147       the grounds that routing the same address twice would always produce the
4148       same answer. This might have been true once, but it is certainly no
4149       longer true now. Routing a child address may depend on the previous
4150       routing that produced that child. Some complicated redirection strategies
4151       went wrong when messages had multiple recipients, and made Exim's
4152       behaviour dependent on the order in which the addresses were given.
4153
4154       I have moved the duplicate checking until after the routing is complete.
4155       Exim scans the addresses that are assigned to local and remote
4156       transports, and removes any duplicates. This means that more work will be
4157       done, as duplicates will always all be routed, but duplicates are
4158       presumably rare, so I don't expect this is of any significance.
4159
4160       For deliveries to pipes, files, and autoreplies, the duplicate checking
4161       still happens during the routing process, since they are not going to be
4162       routed further.
4163
4164 PH/38 Installed a patch from Ian Freislich, with the agreement of Tom Kistner.
4165       It corrects a timeout issue with spamd. This is Ian's comment: "The
4166       background is that sometimes spamd either never reads data from a
4167       connection it has accepted, or it never writes response data. The exiscan
4168       spam.[ch] uses a 3600 second timeout on spamd socket reads, further, it
4169       blindly assumes that writes won't block so it may never time out."
4170
4171 PH/39 Allow G after quota size as well as K and M.
4172
4173 PH/40 The value set for $authenticated_id in an authenticator may not contain
4174       binary zeroes or newlines because the value is written to log lines and
4175       to spool files. There was no check on this. Now the value is run through
4176       the string_printing() function so that such characters are converted to
4177       printable escape sequences.
4178
4179 PH/41 $message_linecount is a new variable that contains the total number of
4180       lines in the message. Compare $body_linecount, which is the count for the
4181       body only.
4182
4183 PH/42 Exim no longer gives details of delivery errors for specific addresses in
4184       bounce and delay warning messages, except in certain special cases, which
4185       are as follows:
4186
4187       (a) An SMTP error message from a remote host;
4188       (b) A message specified in a :fail: redirection;
4189       (c) A message specified in a "fail" command in a system filter;
4190       (d) A message specified in a FAIL return from the queryprogram router;
4191       (e) A message specified by the cannot_route_message router option.
4192
4193       In these cases only, Exim does include the error details in bounce and
4194       warning messages. There are also a few cases where bland messages such
4195       as "unrouteable address" or "local delivery error" are given.
4196
4197 PH/43 $value is now also set for the "else" part of a ${run expansion.
4198
4199 PH/44 Applied patch from the Sieve maintainer: "The vacation draft is still
4200       being worked on, but at least Exim now implements the latest version to
4201       play with."
4202
4203 PH/45 In a pipe transport, although a timeout while waiting for the pipe
4204       process to complete was treated as a delivery failure, a timeout while
4205       writing the message to the pipe was logged, but erroneously treated as a
4206       successful delivery. Such timeouts include transport filter timeouts. For
4207       consistency with the overall process timeout, these timeouts are now
4208       treated as errors, giving rise to delivery failures by default. However,
4209       there is now a new Boolean option for the pipe transport called
4210       timeout_defer, which, if set TRUE, converts the failures into defers for
4211       both kinds of timeout. A transport filter timeout is now identified in
4212       the log output.
4213
4214 PH/46 The "scripts/Configure-config.h" script calls "make" at one point. On
4215       systems where "make" and "gmake" are different, calling "gmake" at top
4216       level broke things. I've arranged for the value of $(MAKE) to be passed
4217       from the Makefile to this script so that it can call the same version of
4218       "make".
4219
4220
4221 A note about Exim versions 4.44 and 4.50
4222 ----------------------------------------
4223
4224 Exim 4.50 was meant to be the next release after 4.43. It contains a lot of
4225 changes of various kinds. As a consequence, a big documentation update was
4226 needed. This delayed the release for rather longer than seemed good, especially
4227 in the light of a couple of (minor) security issues. Therefore, the changes
4228 that fixed bugs were backported into 4.43, to create a 4.44 maintenance
4229 release. So 4.44 and 4.50 are in effect two different branches that both start
4230 from 4.43.
4231
4232 I have left the 4.50 change log unchanged; it contains all the changes since
4233 4.43. The change log for 4.44 is below; many of its items are identical to
4234 those for 4.50. This seems to be the most sensible way to preserve the
4235 historical information.
4236
4237
4238 Exim version 4.50
4239 -----------------
4240
4241  1. Minor wording change to the doc/README.SIEVE file.
4242
4243  2. Change 4.43/35 introduced a bug: if quota_filecount was set, the
4244     computation of the current number of files was incorrect.
4245
4246  3. Closing a stable door: arrange to panic-die if setitimer() ever fails. The
4247     bug fixed in 4.43/37 would have been diagnosed quickly if this had been in
4248     place.
4249
4250  4. Give more explanation in the error message when the command for a transport
4251     filter fails to execute.
4252
4253  5. There are several places where Exim runs a non-Exim command in a
4254     subprocess. The SIGUSR1 signal should be disabled for these processes. This
4255     was being done only for the command run by the queryprogram router. It is
4256     now done for all such subprocesses. The other cases are: ${run, transport
4257     filters, and the commands run by the lmtp and pipe transports.
4258
4259  6. Added CONFIGURE_GROUP build-time option.
4260
4261  7. Some older OS have a limit of 256 on the maximum number of file
4262     descriptors. Exim was using setrlimit() to set 1000 as a large value
4263     unlikely to be exceeded. Change 4.43/17 caused a lot of logging on these
4264     systems. I've change it so that if it can't get 1000, it tries for 256.
4265
4266  8. "control=submission" was allowed, but had no effect, in a DATA ACL. This
4267     was an oversight, and furthermore, ever since the addition of extra
4268     controls (e.g. 4.43/32), the checks on when to allow different forms of
4269     "control" were broken. There should now be diagnostics for all cases when a
4270     control that does not make sense is encountered.
4271
4272  9. Added the /retain_sender option to "control=submission".
4273
4274 10. $recipients is now available in the predata ACL (oversight).
4275
4276 11. Tidy the search cache before the fork to do a delivery from a message
4277     received from the command line. Otherwise the child will trigger a lookup
4278     failure and thereby defer the delivery if it tries to use (for example) a
4279     cached ldap connection that the parent has called unbind on.
4280
4281 12. If verify=recipient was followed by verify=sender in a RCPT ACL, the value
4282     of $address_data from the recipient verification was clobbered by the
4283     sender verification.
4284
4285 13. The value of address_data from a sender verification is now available in
4286     $sender_address_data in subsequent conditions in the ACL statement.
4287
4288 14. Added forbid_sieve_filter and forbid_exim_filter to the redirect router.
4289
4290 15. Added a new option "connect=<time>" to callout options, to set a different
4291     connection timeout.
4292
4293 16. If FIXED_NEVER_USERS was defined, but empty, Exim was assuming the uid 0
4294     was its contents. (It was OK if the option was not defined at all.)
4295
4296 17. A "Completed" log line is now written for messages that are removed from
4297     the spool by the -Mrm option.
4298
4299 18. New variables $sender_verify_failure and $recipient_verify_failure contain
4300     information about exactly what failed.
4301
4302 19. Added -dd to debug only the daemon process.
4303
4304 20. Incorporated Michael Haardt's patch to ldap.c for improving the way it
4305     handles timeouts, both on the server side and network timeouts. Renamed the
4306     CONNECT parameter as NETTIMEOUT (but kept the old name for compatibility).
4307
4308 21. The rare case of EHLO->STARTTLS->HELO was setting the protocol to "smtp".
4309     It is now set to "smtps".
4310
4311 22. $host_address is now set to the target address during the checking of
4312     ignore_target_hosts.
4313
4314 23. When checking ignore_target_hosts for an ipliteral router, no host name was
4315     being passed; this would have caused $sender_host_name to have been used if
4316     matching the list had actually called for a host name (not very likely,
4317     since this list is usually IP addresses). A host name is now passed as
4318     "[x.x.x.x]".
4319
4320 24. Changed the calls that set up the SIGCHLD handler in the daemon to use the
4321     code that specifies a non-restarting handler (typically sigaction() in
4322     modern systems) in an attempt to fix a rare and obscure crash bug.
4323
4324 25. Narrowed the window for a race in the daemon that could cause it to ignore
4325     SIGCHLD signals. This is not a major problem, because they are used only to
4326     wake it up if nothing else does.
4327
4328 26. A malformed maildirsize file could cause Exim to calculate negative values
4329     for the mailbox size or file count. Odd effects could occur as a result.
4330     The maildirsize information is now recalculated if the size or filecount
4331     end up negative.
4332
4333 27. Added HAVE_SYS_STATVFS_H to the os.h file for Linux, as it has had this
4334     support for a long time. Removed HAVE_SYS_VFS_H.
4335
4336 28. Installed the latest version of exipick from John Jetmore.
4337
4338 29. In an address list, if the pattern was not a regular expression, an empty
4339     subject address (from a bounce message) matched only if the pattern was an
4340     empty string. Non-empty patterns were not even tested. This was the wrong
4341     because it is perfectly reasonable to use an empty address as part of a
4342     database query. An empty address is now tested by patterns that are
4343     lookups. However, all the other forms of pattern expect the subject to
4344     contain a local part and a domain, and therefore, for them, an empty
4345     address still always fails if the pattern is not itself empty.
4346
4347 30. Exim went into a mad DNS loop when attempting to do a callout where the
4348     host was specified on an smtp transport, and looking it up yielded more
4349     than one IP address.
4350
4351 31. Re-factored the code for checking spool and log partition space into a
4352     function that finds that data and another that does the check. The former
4353     is then used to implement four new variables: $spool_space, $log_space,
4354     $spool_inodes, and $log_inodes.
4355
4356 32. The RFC2047 encoding function was originally intended for short strings
4357     such as real names; it was not keeping to the 75-character limit for
4358     encoded words that the RFC imposes. It now respects the limit, and
4359     generates multiple encoded words if necessary. To be on the safe side, I
4360     have increased the buffer size for the ${rfc2047: expansion operator from
4361     1024 to 2048 bytes.
4362
4363 33. It is now permitted to omit both strings after an "if" condition; if the
4364     condition is true, the result is "true". As before, when the second string
4365     is omitted, a false condition yields an empty string. This makes it less
4366     cumbersome to write custom ACL and router conditions.
4367
4368 34. Failure to deliver a bounce message always caused it to be frozen, even if
4369     there was an errors_to setting on the router. The errors_to setting is now
4370     respected.
4371
4372 35. If an IPv6 address is given for -bh or -bhc, it is now converted to the
4373     canonical form (fully expanded) before being placed in
4374     $sender_host_address.
4375
4376 36. The table in the code that translates DNS record types into text (T_A to
4377     "A" for instance) was missing entries for NS and CNAME. It is just possible
4378     that this could have caused confusion if both these types were looked up
4379     for the same domain, because the text type is used as part of Exim's
4380     per-process caching. But the chance of anyone hitting this buglet seems
4381     very small.
4382
4383 37. The dnsdb lookup has been extended in a number of ways.
4384
4385     (1) There is a new type, "zns", which walks up the domain tree until it
4386         finds some nameserver records. It should be used with care.
4387
4388     (2) There is a new type, "mxh", which is like "mx" except that it returns
4389         just the host names, not the priorities.
4390
4391     (3) It is now possible to give a list of domains (or IP addresses) to be
4392         looked up. The behaviour when one of the lookups defers can be
4393         controlled by a keyword.
4394
4395     (4) It is now possible to specify the separator character for use when
4396         multiple records are returned.
4397
4398 38. The dnslists ACL condition has been extended: it is now possible to supply
4399     a list of IP addresses and/or domains to be looked up in a particular DNS
4400     domain.
4401
4402 39. Added log_selector=+queue_time_overall.
4403
4404 40. When running the queue in the test harness, wait just a tad after forking a
4405     delivery process, to get repeatability of debugging output.
4406
4407 41. Include certificate and key file names in error message when GnuTLS fails
4408     to set them up, because the GnuTLS error message doesn't include the name
4409     of the failing file when there is a problem reading it.
4410
4411 42. Allow both -bf and -bF in the same test run.
4412
4413 43. Did the same fix as 41 above for OpenSSL, which had the same infelicity.
4414
4415 44. The "Exiscan patch" is now merged into the mainline Exim source.
4416
4417 45. Sometimes the final signoff response after QUIT could fail to get
4418     transmitted in the non-TLS case. Testing !tls_active instead of tls_active
4419     < 0 before doing a fflush(). This bug looks as though it goes back to the
4420     introduction of TLS in release 3.20, but "sometimes" must have been rare
4421     because the tests only now provoked it.
4422
4423 46. Reset the locale to "C" after calling embedded Perl, in case it was changed
4424     (this can affect the format of dates).
4425
4426 47. exim_tidydb, when checking for the continued existence of a message for
4427     which it has found a message-specific retry record, was not finding
4428     messages that were in split spool directories. Consequently, it was
4429     deleting retry records that should have stayed in existence.
4430
4431 48. Steve fixed some bugs in eximstats.
4432
4433 49. The SPA authentication driver was not abandoning authentication and moving
4434     on to the next authenticator when an expansion was forced to fail,
4435     contradicting the general specification for all authenticators. Instead it
4436     was generating a temporary error. It now behaves as specified.
4437
4438 50. The default ordering of permitted cipher suites for GnuTLS was pessimal
4439     (the order specifies the preference for clients). The order is now AES256,
4440     AES128, 3DES, ARCFOUR128.
4441
4442 51. Small patch to Sieve code - explicitly set From: when generating an
4443     autoreply.
4444
4445 52. Exim crashed if a remote delivery caused a very long error message to be
4446     recorded - for instance if somebody sent an entire SpamAssassin report back
4447     as a large number of 550 error lines. This bug was coincidentally fixed by
4448     increasing the size of one of Exim's internal buffers (big_buffer) that
4449     happened as part of the Exiscan merge. However, to be on the safe side, I
4450     have made the code more robust (and fixed the comments that describe what
4451     is going on).
4452
4453 53. Now that there can be additional text after "Completed" in log lines (if
4454     the queue_time_overall log selector is set), a one-byte patch to exigrep
4455     was needed to allow it to recognize "Completed" as not the last thing in
4456     the line.
4457
4458 54. The LDAP lookup was not handling a return of LDAP_RES_SEARCH_REFERENCE. A
4459     patch that reportedly fixes this has been added. I am not expert enough to
4460     create a test for it. This is what the patch creator wrote:
4461
4462       "I found a little strange behaviour of ldap code when working with
4463       Windows 2003 AD Domain, where users was placed in more than one
4464       Organization Units. When I tried to give exim partial DN, the exit code
4465       of ldap_search was unknown to exim because of LDAP_RES_SEARCH_REFERENCE.
4466       But simultaneously result of request was absolutely normal ldap result,
4467       so I produce this patch..."
4468
4469     Later: it seems that not all versions of LDAP support LDAP_RES_SEARCH_
4470     REFERENCE, so I have modified the code to exclude the patch when that macro
4471     is not defined.
4472
4473 55. Some experimental protocols are using DNS PTR records for new purposes. The
4474     keys for these records are domain names, not reversed IP addresses. The
4475     dnsdb PTR lookup now tests whether its key is an IP address. If not, it
4476     leaves it alone. Component reversal etc. now happens only for IP addresses.
4477     CAN-2005-0021
4478
4479 56. Improve error message when ldap_search() fails in OpenLDAP or Solaris LDAP.
4480
4481 57. Double the size of the debug message buffer (to 2048) so that more of very
4482     long debug lines gets shown.
4483
4484 58. The exicyclog utility now does better if the number of log files to keep
4485     exceeds 99. In this case, it numbers them 001, 002 ... instead of 01, 02...
4486
4487 59. Two changes related to the smtp_active_hostname option:
4488
4489       (1) $smtp_active_hostname is now available as a variable.
4490       (2) The default for smtp_banner uses $smtp_active_hostname instead
4491           of $primary_hostname.
4492
4493 60. The host_aton() function is supposed to be passed a string that is known
4494     to be a valid IP address. However, in the case of IPv6 addresses, it was
4495     not checking this. This is a hostage to fortune. Exim now panics and dies
4496     if the condition is not met. A case was found where this could be provoked
4497     from a dnsdb PTR lookup with an IPv6 address that had more than 8
4498     components; fortuitously, this particular loophole had already been fixed
4499     by change 4.50/55 above.
4500
4501     If there are any other similar loopholes, the new check in host_aton()
4502     itself should stop them being exploited. The report I received stated that
4503     data on the command line could provoke the exploit when Exim was running as
4504     exim, but did not say which command line option was involved. All I could
4505     find was the use of -be with a bad dnsdb PTR lookup, and in that case it is
4506     running as the user.
4507     CAN-2005-0021
4508
4509 61. There was a buffer overflow vulnerability in the SPA authentication code
4510     (which came originally from the Samba project). I have added a test to the
4511     spa_base64_to_bits() function which I hope fixes it.
4512     CAN-2005-0022
4513
4514 62. Configuration update for GNU/Hurd and variations. Updated Makefile-GNU and
4515     os.h-GNU, and added configuration files for GNUkFreeBSD and GNUkNetBSD.
4516
4517 63. The daemon start-up calls getloadavg() while still root for those OS that
4518     need the first call to be done as root, but it missed one case: when
4519     deliver_queue_load_max is set with deliver_drop_privilege. This is
4520     necessary for the benefit of the queue runner, because there is no re-exec
4521     when deliver_drop_privilege is set.
4522
4523 64. A call to exiwhat cut short delays set up by "delay" modifiers in ACLs.
4524     This has been fixed.
4525
4526 65. Caching of lookup data for "hosts =" ACL conditions, when a named host list
4527     was in use, was not putting the data itself into the right store pool;
4528     consequently, it could be overwritten for a subsequent message in the same
4529     SMTP connection. (Fix 4.40/11 dealt with the non-cache case, but overlooked
4530     the caching.)
4531
4532 66. Added hosts_max_try_hardlimit to the smtp transport, default 50.
4533
4534 67. The string_is_ip_address() function returns 0, 4, or 6, for "no an IP
4535     address", "IPv4 address", and "IPv6 address", respectively. Some calls of
4536     the function were treating the return as a boolean value, which happened to
4537     work because 0=false and not-0=true, but is not correct code.
4538
4539 68. The host_aton() function was not handling scoped IPv6 addresses (those
4540     with, for example, "%eth0" on the end) correctly.
4541
4542 69. Fixed some compiler warnings in acl.c for the bitmaps specified with
4543     negated items (that is, ~something) in unsigned ints. Some compilers
4544     apparently mutter when there is no cast.
4545
4546 70. If an address verification called from an ACL failed, and did not produce a
4547     user-specific message (i.e. there was only a "system" message), nothing was
4548     put in $acl_verify_message. In this situation, it now puts the system
4549     message there.
4550
4551 71. Change 4.23/11 added synchronization checking at the start of an SMTP
4552     session; change 4.31/43 added the unwanted input to the log line - except
4553     that it did not do this in the start of session case. It now does.
4554
4555 72. After a timeout in a callout SMTP session, Exim still sent a QUIT command.
4556     This is wrong and can cause the other end to generate a synchronization
4557     error if it is another Exim or anything else that does the synchronization
4558     check. A QUIT command is no longer sent after a timeout.
4559
4560 73. $host_lookup_deferred has been added, to make it easier to detect DEFERs
4561     during host lookups.
4562
4563 74. The defer_ok option of callout verification was not working if it was used
4564     when verifying addresses in header lines, that is, for this case:
4565
4566       verify = header_sender/callout=defer_ok
4567
4568 75. A backgrounded daemon closed stdin/stdout/stderr on entry; this meant that
4569     those file descriptors could be used for SMTP connections. If anything
4570     wrote to stderr (the example that came up was "warn" in embedded Perl), it
4571     could be sent to the SMTP client, causing chaos. The daemon now opens
4572     stdin, stdout, and stderr to /dev/null when it puts itself into the
4573     background.
4574
4575 76. Arrange for output from Perl's "warn" command to be written to Exim's main
4576     log by default. The user can override this with suitable Perl magic.
4577
4578 77. The use of log_message on a "discard" ACL verb, which is supposed to add to
4579     the log message when discard triggers, was not working for the DATA ACL or
4580     for the non-SMTP ACL.
4581
4582 78. Error message wording change in sieve.c.
4583
4584 79. If smtp_accept_max_per_host was set, the number of connections could be
4585     restricted to fewer than expected, because the daemon was trying to set up
4586     a new connection before checking whether the processes handling previous
4587     connections had finished. The check for completed processes is now done
4588     earlier. On busy systems, this bug wouldn't be noticed because something
4589     else would have woken the daemon, and it would have reaped the completed
4590     process earlier.
4591
4592 80. If a message was submitted locally by a user whose login name contained one
4593     or more spaces (ugh!), the spool file that Exim wrote was not re-readable.
4594     It caused a spool format error. I have fixed the spool reading code. A
4595     related problem was that the "from" clause in the Received: line became
4596     illegal because of the space(s). It is now covered by ${quote_local_part.
4597
4598 81. Included the latest eximstats from Steve (adds average sizes to HTML Top
4599     tables).
4600
4601 82. Updated OS/Makefile-AIX as per message from Mike Meredith.
4602
4603 83. Patch from Sieve maintainer to fix unterminated string problem in
4604     "vacation" handling.
4605
4606 84. Some minor changes to the Linux configuration files to help with other
4607     OS variants using glibc.
4608
4609 85. One more patch for Sieve to update vacation handling to latest spec.
4610
4611
4612 ----------------------------------------------------
4613 See the note above about the 4.44 and 4.50 releases.
4614 ----------------------------------------------------
4615
4616
4617 Exim version 4.44
4618 -----------------
4619
4620  1. Change 4.43/35 introduced a bug that caused file counts to be
4621     incorrectly computed when quota_filecount was set in an appendfile
4622     transport
4623
4624  2. Closing a stable door: arrange to panic-die if setitimer() ever fails. The
4625     bug fixed in 4.43/37 would have been diagnosed quickly if this had been in
4626     place.
4627
4628  3. Give more explanation in the error message when the command for a transport
4629     filter fails to execute.
4630
4631  4. There are several places where Exim runs a non-Exim command in a
4632     subprocess. The SIGUSR1 signal should be disabled for these processes. This
4633     was being done only for the command run by the queryprogram router. It is
4634     now done for all such subprocesses. The other cases are: ${run, transport
4635     filters, and the commands run by the lmtp and pipe transports.
4636
4637  5. Some older OS have a limit of 256 on the maximum number of file
4638     descriptors. Exim was using setrlimit() to set 1000 as a large value
4639     unlikely to be exceeded. Change 4.43/17 caused a lot of logging on these
4640     systems. I've change it so that if it can't get 1000, it tries for 256.
4641
4642  6. "control=submission" was allowed, but had no effect, in a DATA ACL. This
4643     was an oversight, and furthermore, ever since the addition of extra
4644     controls (e.g. 4.43/32), the checks on when to allow different forms of
4645     "control" were broken. There should now be diagnostics for all cases when a
4646     control that does not make sense is encountered.
4647
4648  7. $recipients is now available in the predata ACL (oversight).
4649
4650  8. Tidy the search cache before the fork to do a delivery from a message
4651     received from the command line. Otherwise the child will trigger a lookup
4652     failure and thereby defer the delivery if it tries to use (for example) a
4653     cached ldap connection that the parent has called unbind on.
4654
4655  9. If verify=recipient was followed by verify=sender in a RCPT ACL, the value
4656     of $address_data from the recipient verification was clobbered by the
4657     sender verification.
4658
4659 10. If FIXED_NEVER_USERS was defined, but empty, Exim was assuming the uid 0
4660     was its contents. (It was OK if the option was not defined at all.)
4661
4662 11. A "Completed" log line is now written for messages that are removed from
4663     the spool by the -Mrm option.
4664
4665 12. $host_address is now set to the target address during the checking of
4666     ignore_target_hosts.
4667
4668 13. When checking ignore_target_hosts for an ipliteral router, no host name was
4669     being passed; this would have caused $sender_host_name to have been used if
4670     matching the list had actually called for a host name (not very likely,
4671     since this list is usually IP addresses). A host name is now passed as
4672     "[x.x.x.x]".
4673
4674 14. Changed the calls that set up the SIGCHLD handler in the daemon to use the
4675     code that specifies a non-restarting handler (typically sigaction() in
4676     modern systems) in an attempt to fix a rare and obscure crash bug.
4677
4678 15. Narrowed the window for a race in the daemon that could cause it to ignore
4679     SIGCHLD signals. This is not a major problem, because they are used only to
4680     wake it up if nothing else does.
4681
4682 16. A malformed maildirsize file could cause Exim to calculate negative values
4683     for the mailbox size or file count. Odd effects could occur as a result.
4684     The maildirsize information is now recalculated if the size or filecount
4685     end up negative.
4686
4687 17. Added HAVE_SYS_STATVFS_H to the os.h file for Linux, as it has had this
4688     support for a long time. Removed HAVE_SYS_VFS_H.
4689
4690 18. Updated exipick to current release from John Jetmore.
4691
4692 19. Allow an empty sender to be matched against a lookup in an address list.
4693     Previously the only cases considered were a regular expression, or an
4694     empty pattern.
4695
4696 20. Exim went into a mad DNS lookup loop when doing a callout where the
4697     host was specified on the transport, if the DNS lookup yielded more than
4698     one IP address.
4699
4700 21. The RFC2047 encoding function was originally intended for short strings
4701     such as real names; it was not keeping to the 75-character limit for
4702     encoded words that the RFC imposes. It now respects the limit, and
4703     generates multiple encoded words if necessary. To be on the safe side, I
4704     have increased the buffer size for the ${rfc2047: expansion operator from
4705     1024 to 2048 bytes.
4706
4707 22. Failure to deliver a bounce message always caused it to be frozen, even if
4708     there was an errors_to setting on the router. The errors_to setting is now
4709     respected.
4710
4711 23. If an IPv6 address is given for -bh or -bhc, it is now converted to the
4712     canonical form (fully expanded) before being placed in
4713     $sender_host_address.
4714
4715 24. Updated eximstats to version 1.33
4716
4717 25. Include certificate and key file names in error message when GnuTLS fails
4718     to set them up, because the GnuTLS error message doesn't include the name
4719     of the failing file when there is a problem reading it.
4720
4721 26. Expand error message when OpenSSL has problems setting up cert/key files.
4722     As per change 25.
4723
4724 27. Reset the locale to "C" after calling embedded Perl, in case it was changed
4725     (this can affect the format of dates).
4726
4727 28. exim_tidydb, when checking for the continued existence of a message for
4728     which it has found a message-specific retry record, was not finding
4729     messages that were in split spool directories. Consequently, it was
4730     deleting retry records that should have stayed in existence.
4731
4732 29. eximstats updated to version 1.35
4733     1.34 - allow eximstats to parse syslog lines as well as mainlog lines
4734     1.35 - bugfix such that pie charts by volume are generated correctly
4735
4736 30. The SPA authentication driver was not abandoning authentication and moving
4737     on to the next authenticator when an expansion was forced to fail,
4738     contradicting the general specification for all authenticators. Instead it
4739     was generating a temporary error. It now behaves as specified.
4740
4741 31. The default ordering of permitted cipher suites for GnuTLS was pessimal
4742     (the order specifies the preference for clients). The order is now AES256,
4743     AES128, 3DES, ARCFOUR128.
4744
4745 31. Small patch to Sieve code - explicitly set From: when generating an
4746     autoreply.
4747
4748 32. Exim crashed if a remote delivery caused a very long error message to be
4749     recorded - for instance if somebody sent an entire SpamAssassin report back
4750     as a large number of 550 error lines. This bug was coincidentally fixed by
4751     increasing the size of one of Exim's internal buffers (big_buffer) that
4752     happened as part of the Exiscan merge. However, to be on the safe side, I
4753     have made the code more robust (and fixed the comments that describe what
4754     is going on).
4755
4756 33. Some experimental protocols are using DNS PTR records for new purposes. The
4757     keys for these records are domain names, not reversed IP addresses. The
4758     dnsdb PTR lookup now tests whether its key is an IP address. If not, it
4759     leaves it alone. Component reversal etc. now happens only for IP addresses.
4760     CAN-2005-0021
4761
4762 34. The host_aton() function is supposed to be passed a string that is known
4763     to be a valid IP address. However, in the case of IPv6 addresses, it was
4764     not checking this. This is a hostage to fortune. Exim now panics and dies
4765     if the condition is not met. A case was found where this could be provoked
4766     from a dnsdb PTR lookup with an IPv6 address that had more than 8
4767     components; fortuitously, this particular loophole had already been fixed
4768     by change 4.50/55 or 4.44/33 above.
4769
4770     If there are any other similar loopholes, the new check in host_aton()
4771     itself should stop them being exploited. The report I received stated that
4772     data on the command line could provoke the exploit when Exim was running as
4773     exim, but did not say which command line option was involved. All I could
4774     find was the use of -be with a bad dnsdb PTR lookup, and in that case it is
4775     running as the user.
4776     CAN-2005-0021
4777
4778 35. There was a buffer overflow vulnerability in the SPA authentication code
4779     (which came originally from the Samba project). I have added a test to the
4780     spa_base64_to_bits() function which I hope fixes it.
4781     CAN-2005-0022
4782
4783 36. The daemon start-up calls getloadavg() while still root for those OS that
4784     need the first call to be done as root, but it missed one case: when
4785     deliver_queue_load_max is set with deliver_drop_privilege. This is
4786     necessary for the benefit of the queue runner, because there is no re-exec
4787     when deliver_drop_privilege is set.
4788
4789 37. Caching of lookup data for "hosts =" ACL conditions, when a named host list
4790     was in use, was not putting the data itself into the right store pool;
4791     consequently, it could be overwritten for a subsequent message in the same
4792     SMTP connection. (Fix 4.40/11 dealt with the non-cache case, but overlooked
4793     the caching.)
4794
4795 38. Sometimes the final signoff response after QUIT could fail to get
4796     transmitted in the non-TLS case. Testing !tls_active instead of tls_active
4797     < 0 before doing a fflush(). This bug looks as though it goes back to the
4798     introduction of TLS in release 3.20, but "sometimes" must have been rare
4799     because the tests only now provoked it.
4800
4801
4802 Exim version 4.43
4803 -----------------
4804
4805  1. Fixed a longstanding but relatively impotent bug: a long time ago, before
4806     PIPELINING, the function smtp_write_command() used to return TRUE or FALSE.
4807     Now it returns an integer. A number of calls were still expecting a T/F
4808     return. Fortuitously, in all cases, the tests worked in OK situations,
4809     which is the norm. However, things would have gone wrong on any write
4810     failures on the smtp file descriptor. This function is used when sending
4811     messages over SMTP and also when doing verify callouts.
4812
4813  2. When Exim is called to do synchronous delivery of a locally submitted
4814     message (the -odf or -odi options), it no longer closes stderr before doing
4815     the delivery.
4816
4817  3. Implemented the mua_wrapper option.
4818
4819  4. Implemented mx_fail_domains and srv_fail_domains for the dnslookup router.
4820
4821  5. Implemented the functions header_remove(), header_testname(),
4822     header_add_at_position(), and receive_remove_recipient(), and exported them
4823     to local_scan().
4824
4825  6. If an ACL "warn" statement specified the addition of headers, Exim already
4826     inserted X-ACL-Warn: at the start if there was no header name. However, it
4827     was not making this test for the second and subsequent header lines if
4828     there were newlines in the string. This meant that an invalid header could
4829     be inserted if Exim was badly configured.
4830
4831  7. Allow an ACL "warn" statement to add header lines at the start or after all
4832     the Received: headers, as well as at the end.
4833
4834  8. Added the rcpt_4xx retry error code.
4835
4836  9. Added postmaster_mailfrom=xxx to callout verification option.
4837
4838 10. Added mailfrom=xxxx to the callout verification option, for verify=
4839     header_sender only.
4840
4841 11. ${substr_1_:xxxx} and ${substr__3:xxxx} are now diagnosed as syntax errors
4842     (they previously behaved as ${substr_1_0:xxxx} and ${substr:_0_3:xxxx}).
4843
4844 12. Inserted some casts to stop certain compilers warning when using pointer
4845     differences as field lengths or precisions in printf-type calls (mostly
4846     affecting debugging statements).
4847
4848 13. Added optional readline() support for -be (dynamically loaded).
4849
4850 14. Obscure bug fix: if a message error (e.g. 4xx to MAIL) happened within the
4851     same clock tick as a message's arrival, so that its received time was the
4852     same as the "first fail" time on the retry record, and that message
4853     remained on the queue past the ultimate address timeout, every queue runner
4854     would try a delivery (because it was past the ultimate address timeout) but
4855     after another failure, the ultimate address timeout, which should have then
4856     bounced the address, did not kick in. This was a "< instead of <=" error;
4857     in most cases the first failure would have been in the next clock tick
4858     after the received time, and all would be well.
4859
4860 15. The special items beginning with @ in domain lists (e.g. @mx_any) were not
4861     being recognized when the domain list was tested by the match_domain
4862     condition in an expansion string.
4863
4864 16. Added the ${str2b64: operator.
4865
4866 17. Exim was always calling setrlimit() to set a large limit for the number of
4867     processes, without checking whether the existing limit was already
4868     adequate. (It did check for the limit on file descriptors.) Furthermore,
4869     errors from getrlimit() and setrlimit() were being ignored. Now they are
4870     logged to the main and panic logs, but Exim does carry on, to try to do its
4871     job under whatever limits there are.
4872
4873 18. Imported PCRE 5.0.
4874
4875 19. Trivial typo in log message " temporarily refused connection" (the leading
4876     space).
4877
4878 20. If the log selector return_path_on_delivery was set and an address was
4879     redirected to /dev/null, the delivery process crashed because it assumed
4880     that a return path would always be set for a "successful" delivery. In this
4881     case, the whole delivery is bypassed as an optimization, and therefore no
4882     return path is set.
4883
4884 21. Internal re-arrangement: the function for sending a challenge and reading
4885     a response while authentication was assuming a zero-terminated challenge
4886     string. It's now changed to take a pointer and a length, to allow for
4887     binary data in such strings.
4888
4889 22. Added the cyrus_sasl authenticator (code supplied by MBM).
4890
4891 23. Exim was not respecting finduser_retries when seeking the login of the
4892     uid under which it was called; it was always trying 10 times. (The default
4893     setting of finduser_retries is zero.) Also, it was sleeping after the final
4894     failure, which is pointless.
4895
4896 24. Implemented tls_on_connect_ports.
4897
4898 25. Implemented acl_smtp_predata.
4899
4900 26. If the domain in control=submission is set empty, Exim assumes that the
4901     authenticated id is a complete email address when it generates From: or
4902     Sender: header lines.
4903
4904 27. Added "#define SOCKLEN_T int" to OS/os.h-SCO and OS/os.h-SCO_SV. Also added
4905     definitions to OS/Makefile-SCO and OS/Makefile-SCO_SV that put basename,
4906     chown and chgrp in /bin and hostname in /usr/bin.
4907
4908 28. Exim was keeping the "process log" file open after each use, just as it
4909     does for the main log. This opens the possibility of it remaining open for
4910     long periods when the USR1 signal hits a daemon. Occasional processlog
4911     errors were reported, that could have been caused by this. Anyway, it seems
4912     much more sensible not to leave this file open at all, so that is what now
4913     happens.
4914
4915 29. The long-running daemon process does not normally write to the log once it
4916     has entered its main loop, and it closes the log before doing so. This is
4917     so that log files can straightforwardly be renamed and moved. However,
4918     there are a couple of unusual error situations where the daemon does write
4919     log entries, and I had neglected to close the log afterwards.
4920
4921 30. The text of an SMTP error response that was received during a remote
4922     delivery was being truncated at 512 bytes. This is too short for some of
4923     the long messages that one sometimes sees. I've increased the limit to
4924     1024.
4925
4926 31. It is now possible to make retry rules that apply only when a message has a
4927     specific sender, in particular, an empty sender.
4928
4929 32. Added "control = enforce_sync" and "control = no_enforce_sync". This makes
4930     it possible to be selective about when SMTP synchronization is enforced.
4931
4932 33. Added "control = caseful_local_part" and "control = "caselower_local_part".
4933
4934 32. Implemented hosts_connection_nolog.
4935
4936 33. Added an ACL for QUIT.
4937
4938 34. Setting "delay_warning=" to disable warnings was not working; it gave a
4939     syntax error.
4940
4941 35. Added mailbox_size and mailbox_filecount to appendfile.
4942
4943 36. Added control = no_multiline_responses to ACLs.
4944
4945 37. There was a bug in the logic of the code that waits for the clock to tick
4946     in the case where the clock went backwards by a substantial amount such
4947     that the microsecond fraction of "now" was more than the microsecond
4948     fraction of "then" (but the whole seconds number was less).
4949
4950 38. Added support for the libradius Radius client library this is found on
4951     FreeBSD (previously only the radiusclient library was supported).
4952
4953
4954 Exim version 4.42
4955 -----------------
4956
4957  1. When certain lookups returned multiple values in the form name=value, the
4958     quoting of the values was not always being done properly. Specifically:
4959     (a) If the value started with a double quote, but contained no whitespace,
4960         it was not quoted.
4961     (b) If the value contained whitespace other than a space character (i.e.
4962         tabs or newlines or carriage returns) it was not quoted.
4963     This fix has been applied to the mysql and pgsql lookups by writing a
4964     separate quoting function and calling it from the lookup code. The fix
4965     should probably also be applied to nisplus, ibase and oracle lookups, but
4966     since I cannot test any of those, I have not disturbed their existing code.
4967
4968  2. A hit in the callout cache for a specific address caused a log line with no
4969     reason for rejecting RCPT. Now it says "Previous (cached) callout
4970     verification failure".
4971
4972  3. There was an off-by-one bug in the queryprogram router. An over-long
4973     return line was truncated at 256 instead of 255 characters, thereby
4974     overflowing its buffer with the terminating zero. As well as fixing this, I
4975     have increased the buffer size to 1024 (and made a note to document this).
4976
4977  4. If an interrupt, such as the USR1 signal that is send by exiwhat, arrives
4978     when Exim is waiting for an SMTP response from a remote server, Exim
4979     restarts its select() call on the socket, thereby resetting its timeout.
4980     This is not a problem when such interrupts are rare. Somebody set up a cron
4981     job to run exiwhat every 2 minutes, which is less than the normal select()
4982     timeout (5 or 10 minutes). This meant that the select() timeout never
4983     kicked in because it was always reset. I have fixed this by comparing the
4984     time when an interrupt arrives with the time at the start of the first call
4985     to select(). If more time than the timeout has elapsed, the interrupt is
4986     treated as a timeout.
4987
4988  5. Some internal re-factoring in preparation for the addition of Sieve
4989     extensions (by MH). In particular, the "personal" test is moved to a
4990     separate function, and given an option for scanning Cc: and Bcc: (which is
4991     not set for Exim filters).
4992
4993  6. When Exim created an email address using the login of the caller as the
4994     local part (e.g. when creating a From: or Sender: header line), it was not
4995     quoting the local part when it contained special characters such as @.
4996
4997  7. Installed new OpenBSD configuration files.
4998
4999  8. Reworded some messages for syntax errors in "and" and "or" conditions to
5000     try to make them clearer.
5001
5002  9. Callout options, other than the timeout value, were being ignored when
5003     verifying sender addresses in header lines. For example, when using
5004
5005       verify = header_sender/callout=no_cache
5006
5007     the cache was (incorrectly) being used.
5008
5009 10. Added a missing instance of ${EXE} to the exim_install script; this affects
5010     only the Cygwin environment.
5011
5012 11. When return_path_on_delivery was set as a log selector, if different remote
5013     addresses in the same message used different return paths and parallel
5014     remote delivery occurred, the wrong values would sometimes be logged.
5015     (Whenever a remote delivery process finished, the return path value from
5016     the most recently started remote delivery process was logged.)
5017
5018 12. RFC 3848 specifies standard names for the "with" phrase in Received: header
5019     lines when AUTH and/or TLS are in use. This is the "received protocol"
5020     field. Exim used to use "asmtp" for authenticated SMTP, without any
5021     indication (in the protocol name) for TLS use. Now it follows the RFC and
5022     uses "esmtpa" if the connection is authenticated, "esmtps" if it is
5023     encrypted, and "esmtpsa" if it is both encrypted and authenticated. These
5024     names appear in log lines as well as in Received: header lines.
5025
5026 13. Installed MH's patches for Sieve to add the "copy" and "vacation"
5027     extensions, and comparison tests, and to fix some bugs.
5028
5029 14. Changes to the "personal" filter test:
5030
5031     (1) The test was buggy in that it was just doing the equivalent of
5032     "contains" tests on header lines. For example, if a user's address was
5033     anne@some.where, the "personal" test would incorrectly be true for
5034
5035       To: susanne@some.where
5036
5037     This test is now done by extracting each address from the header in turn,
5038     and checking the entire address. Other tests that are part of "personal"
5039     are now done using regular expressions (for example, to check local parts
5040     of addresses in From: header lines).
5041
5042     (2) The list of non-personal local parts in From: addresses has been
5043     extended to include "listserv", "majordomo", "*-request", and "owner-*",
5044     taken from the Sieve specification recommendations.
5045
5046     (3) If the message contains any header line starting with "List-" it is
5047     treated as non-personal.
5048
5049     (4) The test for "circular" in the Subject: header line has been removed
5050     because it now seems ill-conceived.
5051
5052 15. Minor typos in src/EDITME comments corrected.
5053
5054 16. Installed latest exipick from John Jetmore.
5055
5056 17. If headers_add on a router specified a text string that was too long for
5057     string_sprintf() - that is, longer than 8192 bytes - Exim panicked. The use
5058     of string_sprintf() is now avoided.
5059
5060 18. $message_body_size was not set (it was always zero) when running the DATA
5061     ACL and the local_scan() function.
5062
5063 19. For the "mail" command in an Exim filter, no default was being set for
5064     the once_repeat time, causing a random time value to be used if "once" was
5065     specified. (If the value happened to be <= 0, no repeat happened.) The
5066     default is now 0s, meaning "never repeat". The "vacation" command was OK
5067     (its default is 7d). It's somewhat surprising nobody ever noticed this bug
5068     (I found it when inspecting the code).
5069
5070 20. There is now an overall timeout for performing a callout verification. It
5071     defaults to 4 times the callout timeout, which applies to individual SMTP
5072     commands during the callout. The overall timeout applies when there is more
5073     than one host that can be tried. The timeout is checked before trying the
5074     next host. This prevents very long delays if there are a large number of
5075     hosts and all are timing out (e.g. when the network connections are timing
5076     out). The value of the overall timeout can be changed by specifying an
5077     additional sub-option for "callout", called "maxwait". For example:
5078
5079       verify = sender/callout=5s,maxwait=20s
5080
5081 21. Add O_APPEND to the open() call for maildirsize files (Exim already seeks
5082     to the end before writing, but this should make it even safer).
5083
5084 22. Exim was forgetting that it had advertised PIPELINING for the second and
5085     subsequent messages on an SMTP connection. It was also not resetting its
5086     memory on STARTTLS and an internal HELO.
5087
5088 23. When Exim logs an SMTP synchronization error within a session, it now
5089     records whether PIPELINING has been advertised or not.
5090
5091 24. Added 3 instances of "(long int)" casts to time_t variables that were being
5092     formatted using %ld, because on OpenBSD (and perhaps others), time_t is int
5093     rather than long int.
5094
5095 25. Installed the latest Cygwin configuration files from the Cygwin maintainer.
5096
5097 26. Added the never_mail option to autoreply.
5098
5099
5100 Exim version 4.41
5101 -----------------
5102
5103  1. A reorganization of the code in order to implement 4.40/8 caused a daemon
5104     crash if the getsockname() call failed; this can happen if a connection is
5105     closed very soon after it is established. The problem was simply in the
5106     order in which certain operations were done, causing Exim to try to write
5107     to the SMTP stream before it had set up the file descriptor. The bug has
5108     been fixed by making things happen in the correct order.
5109
5110
5111 Exim version 4.40
5112 -----------------
5113
5114  1. If "drop" was used in a DATA ACL, the SMTP output buffer was not flushed
5115     before the connection was closed, thus losing the rejection response.
5116
5117  2. Commented out the definition of SOCKLEN_T in os.h-SunOS5. It is needed for
5118     some early Solaris releases, but causes trouble in current releases where
5119     socklen_t is defined.
5120
5121  3. When std{in,out,err} are closed, re-open them to /dev/null so that they
5122     always exist.
5123
5124  4. Minor refactoring of os.c-Linux to avoid compiler warning when IPv6 is not
5125     configured.
5126
5127  5. Refactoring in expand.c to improve memory usage. Pre-allocate a block so
5128     that releasing the top of it at the end releases what was used for sub-
5129     expansions (unless the block got too big). However, discard this block if
5130     the first thing is a variable or header, so that we can use its block when
5131     it is dynamic (useful for very large $message_headers, for example).
5132
5133  6. Lookups now cache *every* query, not just the most recent. A new, separate
5134     store pool is used for this. It can be recovered when all lookup caches are
5135     flushed. Lookups now release memory at the end of their result strings.
5136     This has involved some general refactoring of the lookup sources.
5137
5138  7. Some code has been added to the store_xxx() functions to reduce the amount
5139     of flapping under certain conditions.
5140
5141  8. log_incoming_interface used to affect only the <= reception log lines. Now
5142     it causes the local interface and port to be added to several more SMTP log
5143     lines, for example "SMTP connection from", and rejection lines.
5144
5145  9. The Sieve author supplied some patches for the doc/README.SIEVE file.
5146
5147 10. Added a conditional definition of _BSD_SOCKLEN_T to os.h-Darwin.
5148
5149 11. If $host_data was set by virtue of a hosts lookup in an ACL, its value
5150     could be overwritten at the end of the current message (or the start of a
5151     new message if it was set in a HELO ACL). The value is now preserved for
5152     the duration of the SMTP connection.
5153
5154 12. If a transport had a headers_rewrite setting, and a matching header line
5155     contained an unqualified address, that address was qualified, even if it
5156     did not match any rewriting rules. The underlying bug was that the values
5157     of the flags that permit the existence of unqualified sender and recipient
5158     addresses in header lines (set by {sender,recipient}_unqualified_hosts for
5159     non-local messages, and by -bnq for local messages) were not being
5160     preserved with the message after it was received.
5161
5162 13. When Exim was logging an SMTP synchronization error, it could sometimes log
5163     "next input=" as part of the text comprising the host identity instead of
5164     the correct text. The code was using the same buffer for two different
5165     strings. However, depending on which order the printing function evaluated
5166     its arguments, the bug did not always show up. Under Linux, for example, my
5167     test suite worked just fine.
5168
5169 14. Exigrep contained a use of Perl's "our" scoping after change 4.31/70. This
5170     doesn't work with some older versions of Perl. It has been changed to "my",
5171     which in any case is probably the better facility to use.
5172
5173 15. A really picky compiler found some instances of statements for creating
5174     error messages that either had too many or two few arguments for the format
5175     string.
5176
5177 16. The size of the buffer for calls to the DNS resolver has been increased
5178     from 1024 to 2048. A larger buffer is needed when performing PTR lookups
5179     for addresses that have a lot of PTR records. This alleviates a problem; it
5180     does not fully solve it.
5181
5182 17. A dnsdb lookup for PTR records that receives more data than will fit in the
5183     buffer now truncates the list and logs the incident, which is the same
5184     action as happens when Exim is looking up a host name and its aliases.
5185     Previously in this situation something unpredictable would happen;
5186     sometimes it was "internal error: store_reset failed".
5187
5188 18. If a server dropped the connection unexpectedly when an Exim client was
5189     using GnuTLS and trying to read a response, the client delivery process
5190     crashed while trying to generate an error log message.
5191
5192 19. If a "warn" verb in an ACL added multiple headers to a message in a single
5193     string, for example:
5194
5195       warn message = H1: something\nH2: something
5196
5197     the text was added as a single header line from Exim's point of view
5198     though it ended up OK in the delivered message. However, searching for the
5199     second and subsequent header lines using $h_h2: did not work. This has been
5200     fixed. Similarly, if a system filter added multiple headers in this way,
5201     the routers could not see them.
5202
5203 20. Expanded the error message when iplsearch is called with an invalid key to
5204     suggest using net-iplsearch in a host list.
5205
5206 21. When running tests using -bh, any delays imposed by "delay" modifiers in
5207     ACLs are no longer actually imposed (and a message to that effect is
5208     output).
5209
5210 22. If a "gecos" field in a passwd entry contained escaped characters, in
5211     particular, if it contained a \" sequence, Exim got it wrong when building
5212     a From: or a Sender: header from that name. A second bug also caused
5213     incorrect handling when an unquoted " was present following a character
5214     that needed quoting.
5215
5216 23. "{crypt}" as a password encryption mechanism for a "crypteq" expansion item
5217     was not being matched caselessly.
5218
5219 24. Arranged for all hyphens in the exim.8 source to be escaped with
5220     backslashes.
5221
5222 25. Change 16 of 4.32, which reversed 71 or 4.31 didn't quite do the job
5223     properly. Recipient callout cache records were still being keyed to include
5224     the sender, even when use_sender was set false. This led to far more
5225     callouts that were necessary. The sender is no longer included in the key
5226     when use_sender is false.
5227
5228 26. Added "control = submission" modifier to ACLs.
5229
5230 27. Added the ${base62d: operator to decode base 62 numbers.
5231
5232 28. dnsdb lookups can now access SRV records.
5233
5234 29. CONFIGURE_OWNER can be set at build time to define an alternative owner for
5235     the configuration file.
5236
5237 30. The debug message "delivering xxxxxx-xxxxxx-xx" is now output in verbose
5238     (-v) mode. This makes the output for a verbose queue run more intelligible.
5239
5240 31. Added a use_postmaster feature to recipient callouts.
5241
5242 32. Added the $body_zerocount variable, containing the number of binary zero
5243     bytes in the message body.
5244
5245 33. The time of last modification of the "new" subdirectory is now used as the
5246     "mailbox time last read" when there is a quota error for a maildir
5247     delivery.
5248
5249 34. Added string comparison operators lt, lti, le, lei, gt, gti, ge, gei.
5250
5251 35. Added +ignore_unknown as a special item in host lists.
5252
5253 36. Code for decoding IPv6 addresses in host lists is now included, even if
5254     IPv6 support is not being compiled. This fixes a bug in which an IPv6
5255     address was recognized as an IP address, but was then not correctly decoded
5256     into binary, causing unexpected and incorrect effects when compared with
5257     another IP address.
5258
5259
5260 Exim version 4.34
5261 -----------------
5262
5263  1. Very minor rewording of debugging text in manualroute to say "list of
5264     hosts" instead of "hostlist".
5265
5266  2. If verify=header_syntax was set, and a header line with an unqualified
5267     address (no domain) and a large number of spaces between the end of the
5268     name and the colon was received, the reception process suffered a buffer
5269     overflow, and (when I tested it) crashed. This was caused by some obsolete
5270     code that should have been removed. The fix is to remove it!
5271
5272  3. When running in the test harness, delay a bit after writing a bounce
5273     message to get a bit more predictability in the log output.
5274
5275  4. Added a call to search_tidyup() just before forking a reception process. In
5276     theory, someone could use a lookup in the expansion of smtp_accept_max_
5277     per_host which, without the tidyup, could leave open a database connection.
5278
5279  5. Added the variables $recipient_data and $sender_data which get set from a
5280     lookup success in an ACL "recipients" or "senders" condition, or a router
5281     "senders" option, similar to $domain_data and $local_part_data.
5282
5283  6. Moved the writing of debug_print from before to after the "senders" test
5284     for routers.
5285
5286  7. Change 4.31/66 (moving the time when the Received: is generated) caused
5287     problems for message scanning, either using a data ACL, or using
5288     local_scan() because the Received: header was not generated till after they
5289     were called (in order to set the time as the time of reception completion).
5290     I have revised the way this works. The header is now generated after the
5291     body is received, but before the ACL or local_scan() are called. After they
5292     are run, the timestamp in the header is updated.
5293
5294
5295 Exim version 4.33
5296 -----------------
5297
5298  1. Change 4.24/6 introduced a bug because the SIGALRM handler was disabled
5299     before starting a queue runner without re-exec. This happened only when
5300     deliver_drop_privilege was set or when the Exim user was set to root. The
5301     effect of the bug was that timeouts during subsequent deliveries caused
5302     crashes instead of being properly handled. The handler is now left at its
5303     default (and expected) setting.
5304
5305  2. The other case in which a daemon avoids a re-exec is to deliver an incoming
5306     message, again when deliver_drop_privilege is set or Exim is run as root.
5307     The bug described in (1) was not present in this case, but the tidying up
5308     of the other signals was missing. I have made the two cases consistent.
5309
5310  3. The ignore_target_hosts setting on a manualroute router was being ignored
5311     for hosts that were looked up using the /MX notation.
5312
5313  4. Added /ignore=<ip list> feature to @mx_any, @mx_primary, and @mx_secondary
5314     in domain lists.
5315
5316  5. Change 4.31/55 was buggy, and broke when there was a rewriting rule that
5317     operated on the sender address. After changing the $sender_address to <>
5318     for the sender address verify, Exim was re-instated it as the original
5319     (before rewriting) address, but remembering that it had rewritten it, so it
5320     wasn't rewriting it again. This bug also had the effect of breaking the
5321     sender address verification caching when the sender address was rewritten.
5322
5323  6. The ignore_target_hosts option was being ignored by the ipliteral router.
5324     This has been changed so that if the ip literal address matches
5325     ignore_target_hosts, the router declines.
5326
5327  7. Added expansion conditions match_domain, match_address, and match_local_
5328     part (NOT match_host).
5329
5330  8. The placeholder for the Received: header didn't have a length field set.
5331
5332  9. Added code to Exim itself and to exim_lock to test for a specific race
5333     condition that could lead to file corruption when using MBX delivery. The
5334     issue is with the lockfile that is created in /tmp. If this file is removed
5335     after a process has opened it but before that process has acquired a lock,
5336     there is the potential for a second process to recreate the file and also
5337     acquire a lock. This could lead to two Exim processes writing to the file
5338     at the same time. The added code performs the same test as UW imapd; it
5339     checks after acquiring the lock that its file descriptor still refers to
5340     the same named file.
5341
5342 10. The buffer for building added header lines was of fixed size, 8192 bytes.
5343     It is now parameterized by HEADER_ADD_BUFFER_SIZE and this can be adjusted
5344     when Exim is built.
5345
5346 11. Added the smtp_active_hostname option. If used, this will typically be made
5347     to depend on the incoming interface address. Because $interface_address is
5348     not set up until the daemon has forked a reception process, error responses
5349     that can happen earlier (such as "too many connections") no longer contain
5350     a host name.
5351
5352 12. If an expansion in a condition on a "warn" statement fails because a lookup
5353     defers, the "warn" statement is abandoned, and the next ACL statement is
5354     processed. Previously this caused the whole ACL to be aborted.
5355
5356 13. Added the iplsearch lookup type.
5357
5358 14. Added ident_timeout as a log selector.
5359
5360 15. Added tls_certificate_verified as a log selector.
5361
5362 16. Added a global option tls_require_ciphers (compare the smtp transport
5363     option of the same name). This controls incoming TLS connections.
5364
5365 17. I finally figured out how to make tls_require_ciphers do a similar thing
5366     in GNUtls to what it does in OpenSSL, that is, set up an appropriate list
5367     before starting the TLS session.
5368
5369 18. Tabs are now shown as \t in -bP output.
5370
5371 19. If the log selector return_path_on_delivery was set, Exim crashed when
5372     bouncing a message because it had too many Received: header lines.
5373
5374 20. If two routers both had headers_remove settings, and the first one included
5375     a superfluous trailing colon, the final name in the first list and the
5376     first name in the second list were incorrectly joined into one item (with a
5377     colon in the middle).
5378
5379
5380 Exim version 4.32
5381 -----------------
5382
5383  1. Added -C and -D options to the exinext utility, mainly to make it easier
5384     to include in the automated testing, but these could be helpful when
5385     multiple configurations are in use.
5386
5387  2. The exinext utility was not formatting the output nicely when there was
5388     an alternate port involved in the retry record key, nor when there was a
5389     message id as well (for retries that were specific to a specific message
5390     and a specific host). It was also confused by IPv6 addresses, because of
5391     the additional colons they contain. I have fixed the IPv4 problem, and
5392     patched it up to do a reasonable job for IPv6.
5393
5394  3. When there is an error after a MAIL, RCPT, or DATA SMTP command during
5395     delivery, the log line now contains "pipelined" if PIPELINING was used.
5396
5397  4. An SMTP transport process used to panic and die if the bind() call to set
5398     an explicit outgoing interface failed. This has been changed; it is now
5399     treated in the same way as a connect() failure.
5400
5401  5. A reference to $sender_host_name in the part of a conditional expansion
5402     that was being skipped was still causing a DNS lookup. This no longer
5403     occurs.
5404
5405  6. The def: expansion condition was not recognizing references to header lines
5406     that used bh_ and bheader_.
5407
5408  7. Added the _cache feature to named lists.
5409
5410  8. The code for checking quota_filecount in the appendfile transport was
5411     allowing one more file than it should have been.
5412
5413  9. For compatibility with Sendmail, the command line option
5414
5415       -prval:sval
5416
5417     is equivalent to
5418
5419       -oMr rval -oMs sval
5420
5421     and sets the incoming protocol and host name (for trusted callers). The
5422     host name and its colon can be omitted when only the protocol is to be set.
5423     Note the Exim already has two private options, -pd and -ps, that refer to
5424     embedded Perl. It is therefore impossible to set a protocol value of "d" or
5425     "s", but I don't think that's a major issue.
5426
5427 10. A number of refactoring changes to the code, none of which should affect
5428     Exim's behaviour:
5429
5430     (a) The number of logging options was getting close to filling up the
5431     32-bit word that was used as a bit map. I have split them into two classes:
5432     those that are passed in the argument to log_write(), and those that are
5433     only ever tested independently outside of that function. These are now in
5434     separate 32-bit words, so there is plenty of room for expansion again.
5435     There is no change in the user interface or the logging behaviour.
5436
5437     (b) When building, for example, log lines, the code previously used a
5438     macro that called string_cat() twice, in order to add two strings. This is
5439     not really sufficiently general. Furthermore, there was one instance where
5440     it was actually wrong because one of the argument was used twice, and in
5441     one call a function was used. (As it happened, calling the function twice
5442     did not affect the overall behaviour.) The macro has been replaced by a
5443     function that can join an arbitrary number of extra strings onto a growing
5444     string.
5445
5446     (c) The code for expansion conditions now uses a table and a binary chop
5447     instead of a serial search (which was left over from when there were very
5448     few conditions). Also, it now recognizes conditions like "pam" even when
5449     the relevant support is not compiled in: a suitably worded error message is
5450     given if an attempt is made to use such a condition.
5451
5452 11. Added ${time_interval:xxxxx}.
5453
5454 12. A bug was causing one of the ddress fields not to be passed back correctly
5455     from remote delivery subprocesses. The field in question was not being
5456     subsequently used, so this caused to problems in practice.
5457
5458 13. Added new log selectors queue_time and deliver_time.
5459
5460 14. Might have fixed a bug in maildirsizefile handling that threw up
5461     "unexpected character" debug warnings, and recalculated the data
5462     unnecessarily. In any case, I expanded the warning message to give more
5463     information.
5464
5465 15. Added the message "Restricted characters in address" to the statements in
5466     the default ACL that block characters like @ and % in local parts.
5467
5468 16. Change 71 for release 4.31 proved to be much less benign that I imagined.
5469     Three changes have been made:
5470
5471     (a) There was a serious bug; a negative response to MAIL caused the whole
5472         recipient domain to be cached as invalid, thereby blocking all messages
5473         to all local parts at the same domain, from all senders. This bug has
5474         been fixed. The domain is no longer cached after a negative response to
5475         MAIL if the sender used is not empty.
5476
5477     (b) The default behaviour of using MAIL FROM:<> for recipient callouts has
5478         been restored.
5479
5480     (c) A new callout option, "use_sender" has been added for people who want
5481         the modified behaviour.
5482
5483
5484 Exim version 4.31
5485 -----------------
5486
5487  1. Removed "EXTRALIBS=-lwrap" from OS/Makefile-Unixware7 on the advice of
5488     Larry Rosenman.
5489
5490  2. Removed "LIBS = -lresolv" from OS/Makefile-Darwin as it is not needed, and
5491     indeed breaks things for older releases.
5492
5493  3. Added additional logging to the case where there is a problem reading data
5494     from a filter that is running in a subprocess using a pipe, in order to
5495     try to track down a specific problem.
5496
5497  4. Testing facility fudge: when running in the test harness and attempting
5498     to connect to 10.x.x.x (expecting a connection timeout) I'm now sometimes
5499     getting "No route to host". Convert this to a timeout.
5500
5501  5. Define ICONV_ARG2_TYPE as "char **" for Unixware7 to avoid compiler
5502     warning.
5503
5504  6. Some OS don't have socklen_t but use size_t instead. This affects the
5505     fifth argument of getsockopt() amongst other things. This is now
5506     configurable by a macro called SOCKLEN_T which defaults to socklen_t, but
5507     can be set for individual OS. I have set it for SunOS5, OSF1, and
5508     Unixware7. Current versions of SunOS5 (aka Solaris) do have socklen_t, but
5509     some earlier ones do not.
5510
5511  7. Change 4.30/15 was not doing the test caselessly.
5512
5513  8. The standard form for an IPv6 address literal was being rejected by address
5514     parsing in, for example, MAIL and RCPT commands. An example of this kind of
5515     address is [IPv6:2002:c1ed:8229:10:202:2dff:fe07:a42a]. Exim now accepts
5516     this, as well as the form without the "IPv6" on the front (but only when
5517     address literals are enabled, of course).
5518
5519  9. Added some casts to avoid compiler warnings in OS/os.c-Linux.
5520
5521 10. Exim crashed if a message with an empty sender address specified by -f
5522     encountered a router with an errors_to setting. This could be provoked only
5523     by a command such as
5524
5525       exim -f "" ...
5526
5527     where an empty string was supplied; "<>" did not hit this bug.
5528
5529 11. Installed PCRE release 4.5.
5530
5531 12. If EHLO/HELO was rejected by an ACL, the value of $sender_helo_name
5532     remained set. It is now erased.
5533
5534 13. exiqgrep wasn't working on MacOS X because it didn't correctly compute
5535     times from message ids (which are base 36 rather than the normal 62).
5536
5537 14. "Expected" SMTP protocol errors that can arise when PIPELINING is in use
5538     were being counted as actual protocol errors, and logged if the log
5539     selector +smtp_protocol_error was set. One cannot be perfect in this test,
5540     but now, if PIPELINING has been advertised, RCPT following a rejected MAIL,
5541     and DATA following a set of rejected RCPTs do not count as protocol errors.
5542     In other words, Exim assumes they were pipelined, though this may not
5543     actually be the case. Of course, in all cases the client gets an
5544     appropriate error code.
5545
5546 15. If a lookup fails in an ACL condition, a message about the failure may
5547     be available; it is used if testing the ACL cannot continue, because most
5548     such messages specify what the cause of the deferral is. However, some
5549     messages (e.g. "MYSQL: no data found") do not cause a defer. There was bug
5550     that caused an old message to be retained and used if a later statement
5551     caused a defer, replacing the real cause of the deferral.
5552
5553 16. If an IP address had so many PTR records that the DNS lookup buffer
5554     was not large enough to hold them, Exim could crash while trying to process
5555     the truncated data. It now detects and logs this case.
5556
5557 17. Further to 4.21/58, another change has been made: if (and only if) the
5558     first line of a message (the first header line) ends with CRLF, a bare LF
5559     in a subsequent header line has a space inserted after it, so as not to
5560     terminate the header.
5561
5562 18. Refactoring: tidied an ugly bit of code in appendfile that copied data
5563     unnecessarily, used atoi() instead of strtol(), and didn't check the
5564     termination when getting file sizes from file names by regex.
5565
5566 19. Completely re-implemented the support for maildirsize files, in the light
5567     of a number of problems with the previous contributed implementation
5568     (4.30/29). In particular:
5569
5570     . If the quota is zero, the maildirsize file is maintained, but no quota is
5571       imposed.
5572
5573     . If the maildir directory does not exist, it is created before any attempt
5574       to write a maildirsize file.
5575
5576     . The quota value in the file is just a cache; if the quota is changed in
5577       the transport, the new value overrides.
5578
5579     . A regular expression is available for excluding directories from the
5580       count.
5581
5582 20. The autoreply transport checks the characters in options that define the
5583     message's headers; it allows continued headers, but it was checking with
5584     isspace() after an embedded newline instead of explicitly looking for a
5585     space or a tab.
5586
5587 21. If all the "regular" hosts to which an address was routed had passed their
5588     expiry times, and had not reached their retry times, the address was
5589     bounced, even if fallback hosts were defined. Now Exim should go on to try
5590     the fallback hosts.
5591
5592 22. Increased buffer sizes in the callout code from 1024 to 4096 to match the
5593     equivalent code in the SMTP transport. Some hosts send humungous responses
5594     to HELO/EHLO, more than 1024 it seems.
5595
5596 23. Refactoring: code in filter.c used (void *) for "any old type" but this
5597     gives compiler warnings in some environments. I've now done it "properly",
5598     using a union.
5599
5600 24. The replacement for inet_ntoa() that is used with gcc on IRIX systems
5601     (because of problems with the built-in one) was declared to return uschar *
5602     instead of char *, causing compiler failure.
5603
5604 25. Fixed a file descriptor leak when processing alias/forward files.
5605
5606 26. Fixed a minor format string issue in dbfn.c.
5607
5608 27. Typo in exim.c: ("dmbnz" for "dbmnz").
5609
5610 28. If a filter file refered to $h_xxx or $message_headers, and the headers
5611     contained RFC 2047 "words", Exim's memory could, under certain conditions,
5612     become corrupted.
5613
5614 29. When a sender address is verified, it is cached, to save repeating the test
5615     when there is more than one recipient in a message. However, when the
5616     verification involves a callout, it is possible for different callout
5617     options to be set for different recipients. It is too complicated to keep
5618     track of this in the cache, so now Exim always runs a verification when a
5619     callout is required, relying on the callout cache for the optimization.
5620     The overhead is duplication of the address routing, but this should not be
5621     too great.
5622
5623 30. Fixed a bug in callout caching. If a RCPT command caused the sender address
5624     to be verified with callout=postmaster, and the main callout worked but the
5625     postmaster check failed, the verification correctly failed. However, if a
5626     subsequent RCPT command asked for sender verification *without* the
5627     postmaster check, incorrect caching caused this verification also to fail,
5628     incorrectly.
5629
5630 31. Exim caches DNS lookup failures so as to avoid multiple timeouts; however,
5631     it was not caching the DNS options (qualify_single, search_parents) that
5632     were used when the lookup failed. A subsequent lookup with different
5633     options therefore always gave the same answer, though there were cases
5634     where it should not have. (Example: a "domains = !$mx_any" option on a
5635     dnslookup router: the "domains" option is always processed without any
5636     widening, but the router might have qualify_single set.) Now Exim uses the
5637     cached value only when the same options are set.
5638
5639 32. Added John Jetmore's "exipick" utility to the distribution.
5640
5641 33. GnuTLS: When an attempt to start a TLS session fails for any reason other
5642     than a timeout (e.g. a certificate is required, and is not provided), an
5643     Exim server now closes the connection immediately. Previously it waited for
5644     the client to close - but if the client is SSL, it seems that they each
5645     wait for each other, leading to a delay before one of them times out.
5646
5647 34: GnuTLS: Updated the code to use the new GnuTLS 1.0.0 API. I have not
5648     maintained 0.8.x compatibility because I don't think many are using it, and
5649     it is clearly obsolete.
5650
5651 35. Added TLS support for CRLs: a tls_crl global option and one for the smtp
5652     transport.
5653
5654 36. OpenSSL: $tls_certificate_verified was being set to 1 even if the
5655     client certificate was expired. A simple patch fixes this, though I don't
5656     understand the full logic of why the verify callback is called multiple
5657     times.
5658
5659 37. OpenSSL: a patch from Robert Roselius: "Enable client-bug workaround.
5660     Versions of OpenSSL as of 0.9.6d include a 'CBC countermeasure' feature,
5661     which causes problems with some clients (such as the Certicom SSL Plus
5662     library used by Eudora). This option, SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS,
5663     disables the coutermeasure allowing Eudora to connect."
5664
5665 38. Exim was not checking that a write() to a log file succeeded. This could
5666     lead to Bad Things if a log got too big, in particular if it hit a file
5667     size limit. Exim now panics and dies if it cannot write to a log file, just
5668     as it does if it cannot open a log file.
5669
5670 39. Modified OS/Makefile-Linux so that it now contains
5671
5672       CFLAGS=-O -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE
5673
5674     The two -D definitions ensure that Exim is compiled with large file
5675     support, which makes it possible to handle log files that are bigger than
5676     2^31.
5677
5678 40. Fixed a subtle caching bug: if (in an ACL or a set of routers, for
5679     instance) a domain was checked against a named list that involved a lookup,
5680     causing $domain_data to be set, then another domain was checked against the
5681     same list, then the first domain was re-checked, the value of $domain_data
5682     after the final check could be wrong. In particular, if the second check
5683     failed, it could be set empty. This bug probably also applied to
5684     $localpart_data.
5685
5686 41. The strip_trailing_dot option was not being applied to the address given
5687     with the -f command-line option.
5688
5689 42. The code for reading a message's header from the spool was incrementing
5690     $received_count, but never initializing it. This meant that the value was
5691     incorrect (doubled) while delivering a message in the same process in which
5692     it was received. In the most common configuration of Exim, this never
5693     happens - a fresh exec is done - but it can happen when
5694     deliver_drop_privilege is set.
5695
5696 43. When Exim logs an SMTP synchronization error - client data sent too soon -
5697     it now includes up to 150 characters of the unexpected data in the log
5698     line.
5699
5700 44. The exim_dbmbuild utility uses fixed size buffers for reading input lines
5701     and building data strings. The size of both of these buffers was 10 000
5702     bytes - far larger than anybody would *ever* want, thought I. Needless to
5703     say, somebody hit the limit. I have increased the maximum line length to
5704     20 000 and the maximum data length of concatenated lines to 100 000. I have
5705     also fixed two bugs, because there was no checking on these buffers. Tsk,
5706     tsk. Now exim_dbmbuild gives a message and exits with an error code if a
5707     buffer is too small.
5708
5709 45. The exim_dbmbuild utility did not support quoted keys, as Exim does in
5710     lsearch lookups. Now it does.
5711
5712 46. When parsing a route_list item in a manualroute router, a fixed-length
5713     buffer was used for the list of hosts. I made this 1024 bytes long,
5714     thinking that nobody would ever have a list of hosts that long. Wrong.
5715     Somebody had a whole pile of complicated expansion conditions, and the
5716     string was silently truncated, leading to an expansion error. It turns out
5717     that it is easier to change to an unlimited length (owing to other changes
5718     that have happened since this code was originally written) than to build
5719     structure for giving a limitation error. The length of the item that
5720     expands into the list of hosts is now unlimited.
5721
5722 47. The lsearch lookup could not handle data where the length of text line was
5723     more than 4095 characters. Such lines were truncated, leading to shortened
5724     data being returned. It should now handle lines of any length.
5725
5726 48. Minor wording revision: "cannot test xxx in yyy ACL" becomes "cannot test
5727     xxx condition in yyy ACL" (e.g. "cannot test domains condition in DATA
5728     ACL").
5729
5730 49. Cosmetic tidy to scripts like exicyclog that are generated by globally
5731     replacing strings such as BIN_DIRECTORY in a source file: the replacement
5732     no longer happens in comment lines. A list of replacements is now placed
5733     at the head of all of the source files, except those whose only change is
5734     to replace PERL_COMMAND in the very first #! line.
5735
5736 50. Replaced the slow insertion sort in queue.c, for sorting the list of
5737     messages on the queue, with a bottom-up merge sort, using code contributed
5738     by Michael Haardt. This should make operations like -bp somewhat faster on
5739     large queues. It won't affect queue runners, except when queue_run_in_order
5740     is set.
5741
5742 51. Installed eximstats 1.31 in the distribution.
5743
5744 52. Added support for SRV lookups to the dnslookup router.
5745
5746 53. If an ACL referred to $message_body or $message_body_end, the value was not
5747     reset for any messages that followed in the same SMTP session.
5748
5749 54. The store-handling optimization for building very long strings was not
5750     differentiating between the different store pools. I don't think this
5751     actually made any difference in practice, but I've tidied it.
5752
5753 55. While running the routers to verify a sender address, $sender_address
5754     was still set to the sender address. This is wrong, because when routing to
5755     send a bounce to the sender, it would be empty. Therefore, I have changed
5756     it so that, while verifying a sender address, $sender_address is set to <>.
5757     (There is no change to what happens when verifying a recipient address.)
5758
5759 56. After finding MX (or SRV) records, Exim was doing a DNS lookup for the
5760     target A or AAAA records (if not already returned) without resetting the
5761     qualify_single or search_parents options of the DNS resolver. These are
5762     inappropriate in this case because the targets of MX and SRV records must
5763     be FQDNs. A broken DNS record could cause trouble if it happened to have a
5764     target that, when qualified, matched something in the local domain. These
5765     two options are now turned off when doing these lookups.
5766
5767 57. It seems that at least some releases of Reiserfs (which does not have the
5768     concept of a fixed number of inodes) returns zero and not -1 for the
5769     number of available inodes. This interacted badly with check_spool_inodes,
5770     which assumed that -1 was the "no such thing" setting. What I have done is
5771     to check that the total number of inodes is greater than zero before doing
5772     the test of how many are available.
5773
5774 58. When a "warn" ACL statement has a log_message modifier, the message is
5775     remembered, and not repeated. This is to avoid a lot of repetition when a
5776     message has many recipients that cause the same warning to be written.
5777     However, Exim was preserving the list of already written lines for an
5778     entire SMTP session, which doesn't seem right. The memory is now reset if a
5779     new message is started.
5780
5781 59. The "rewrite" debugging flag was not showing the result of rewriting in the
5782     debugging output unless log_rewrite was also set.
5783
5784 60. Avoid a compiler warning on 64-bit systems in dsearch.c by avoiding the use
5785     of (int)(handle) when we know that handle contains (void *)(-1).
5786
5787 61. The Exim daemon panic-logs an error return when it closes the incoming
5788     connection. However "connection reset by peer" seems to be common, and
5789     isn't really an error worthy of noting specially, so that particular error
5790     is no long logged.
5791
5792 62. When Exim is trying to find all the local interfaces, it used to panic and
5793     die if the ioctl to get the interface flags failed. However, it seems that
5794     on at least one OS (Solaris 9) it is possible to have an interface that is
5795     included in the list of interfaces, but for which you get a failure error
5796     for this call. This happens when the interface is not "plumbed" into a
5797     protocol (i.e. neither IPv4 nor IPv6). I've changed the code so that a
5798     failure of the "get flags" call assumes that the interface is down.
5799
5800 63. Added a ${eval10: operator, which assumes all numbers are decimal. This
5801     makes life easier for people who are doing arithmetic on fields extracted
5802     from dates, where you often get leading zeros that should not be
5803     interpreted as octal.
5804
5805 64. Added qualify_domain to the redirect router, to override the global
5806     setting.
5807
5808 65. If a pathologically long header line contained very many addresses (the
5809     report of this problem mentioned 10 000) and each of them was rewritten,
5810     Exim could use up a very large amount of memory. (It kept on making new
5811     copies of the header line as it rewrote, and never released the old ones.)
5812     At the expense of a bit more processing, the header rewriting function has
5813     been changed so that it no longer eats memory in this way.
5814
5815 66. The generation of the Received: header has been moved from the time that a
5816     message starts to be received, to the time that it finishes. The timestamp
5817     in the Received: header should now be very close to that of the <= log
5818     line. There are two side-effects of this change:
5819
5820     (a) If a message is rejected by a DATA or non-SMTP ACL or local_scan(), the
5821         logged header lines no longer include the local Received: line, because
5822         it has not yet been created. The same applies to a copy of the message
5823         that is returned to a non-SMTP sender when a message is rejected.
5824
5825     (b) When a filter file is tested using -bf, no additional Received: header
5826         is added to the test message. After some thought, I decided that this
5827         is a bug fix.
5828
5829     This change does not affect the value of $received_for. It is still set
5830     after address rewriting, but before local_scan() is called.
5831
5832 67. Installed the latest Cygwin-specific files from the Cygwin maintainer.
5833
5834 68. GnuTLS: If an empty file is specified for tls_verify_certificates, GnuTLS
5835     gave an unhelpful panic error message, and a defer error. I have managed to
5836     change this behaviour so that it now rejects any supplied certificate,
5837     which seems right, as the list of acceptable certificates is empty.
5838
5839 69. OpenSSL: If an empty file is specified for tls_verify_certificates, OpenSSL
5840     gave an unhelpful defer error. I have not managed to make this reject any
5841     supplied certificates, but the error message it gives is "no certificate
5842     supplied", which is not helpful.
5843
5844 70. exigrep's output now also includes lines that are not associated with any
5845     message, but which match the given pattern. Implemented by a patch from
5846     Martin Sluka, which also tidied up the Perl a bit.
5847
5848 71. Recipient callout verification, like sender verification, was using <> in
5849     the MAIL FROM command. This isn't really the right thing, since the actual
5850     sender may affect whether the remote host accepts the recipient or not. I
5851     have changed it to use the actual sender in the callout; this means that
5852     the cache record is now keyed on a recipient/sender pair, not just the
5853     recipient address. There doesn't seem to be a real danger of callout loops,
5854     since a callout by the remote host to check the sender would use <>.
5855     [SEE ABOVE: changed after hitting problems.]
5856
5857 72. Exim treats illegal SMTP error codes that do not begin with 4 or 5 as
5858     temporary errors. However, in the case of such a code being given after
5859     the end of a data transmission (i.e. after ".") Exim was failing to write
5860     a retry record for the message. (Yes, there was some broken host that was
5861     actually sending 8xx at this point.)
5862
5863 73. An unknown lookup type in a host list could cause Exim to panic-die when
5864     the list was checked. (An example that provoked this was putting <; in the
5865     middle of a list instead of at the start.) If this happened during a DATA
5866     ACL check, a -D file could be left lying around. This kind of configuration
5867     error no longer causes Exim to die; instead it causes a defer error. The
5868     incident is still logged to the main and panic logs.
5869
5870 74. Buglet left over from Exim 3 conversion. The message "too many messages
5871     in one connection" was written to the rejectlog but not the mainlog, except
5872     when address rewriting (yes!) was being logged.
5873
5874 75. Added write_rejectlog option.
5875
5876 76. When a system filter was run not as root (that is, when system_filter_user
5877     was set), the values of the $n variables were not being returned to the
5878     main process; thus, they were not subsequently available in the $sn
5879     variables.
5880
5881 77. Added +return_path_on_delivery log selector.
5882
5883 78. A connection timeout was being treated differently from recipients deferred
5884     when testing hosts_max_try with a message that was older than the host's
5885     retry timeout. (The host should not be counted, thus allowing all hosts to
5886     be tried at least once before bouncing.) This may have been the cause of an
5887     occasionally reported bug whereby a message would remain on the queue
5888     longer than the retry timeout, but would be bounced if a delivery was
5889     forced. I say "may" because I never totally pinned down the problem;
5890     setting up timeout/retry tests is difficult. See also the next item.
5891
5892 79. The ultimate address timeout was not being applied to errors that involved
5893     a combination of host plus message (for example, a timeout on a MAIL
5894     command). When an address resolved to a number of possible hosts, and they
5895     were not all tried for each delivery (e.g. because of hosts_max_try), a
5896     message could remain on the queue longer than the retry timeout.
5897
5898 80. Sieve bug: "stop" inside "elsif" was broken. Applied a patch from Michael
5899     Haardt.
5900
5901 81. Fixed an obscure SMTP outgoing bug which required at least the following
5902     conditions: (a) there was another message waiting for the same server;
5903     (b) the server returned 5xx to all RCPT commands in the first message so
5904     that the message was not completed; (c) the server dropped the connection
5905     or gave a negative response to the RSET that Exim sends to abort the
5906     transaction. The observed case was a dropped connection after DATA that had
5907     been sent in pipelining mode. That is, the server had advertised PIPELINING
5908     but was not implementing it correctly. The effect of the bug was incorrect
5909     behaviour, such as trying another host, and this could lead to a crash.
5910
5911
5912 Exim version 4.30
5913 -----------------
5914
5915  1. The 3rd arguments to getsockname(), getpeername(), and accept() in exim.c
5916     and daemon.c were passed as pointers to ints; they should have been
5917     pointers to socklen_t variables (which are typically unsigned ints).
5918
5919  2. Some signed/unsigned type warnings in the os.c file for Linux have been
5920     fixed.
5921
5922  3. Fixed a really odd bug that affected only the testing scheme; patching a
5923     certain fixed string in the binary changed the value of another string that
5924     happened to be identical to the end of the original first string.
5925
5926  4. When gethostbyname() (or equivalent) is passed an IP address as a "host
5927     name", it returns that address as the IP address. On some operating
5928     systems (e.g. Solaris), it also passes back the IP address string as the
5929     "host name". However, on others (e.g. Linux), it passes back an empty
5930     string. Exim wasn't checking for this, and was changing the host name to an
5931     empty string, assuming it had been canonicalized.
5932
5933  5. Although rare, it is permitted to have more than one PTR record for a given
5934     IP address. I thought that gethostbyaddr() or getipnodebyaddr() always gave
5935     all the names associated with an address, because they do in Solaris.
5936     However, it seems that they do not in Linux for data that comes from the
5937     DNS. If an address in /etc/hosts has multiple names, they _are_ all given.
5938     I found this out when I moved to a new Linux workstation and tried to run
5939     the Exim test suite.
5940
5941     To get round this problem I have changed the code so that it now does its
5942     own call to the DNS to look up PTR records when searching for a host name.
5943     If nothing can be found in the DNS, it tries gethostbyaddr(), so that
5944     addresses that are only in /etc/hosts are still found.
5945
5946     This behaviour is, however, controlled by an option called host_lookup_
5947     order, which defaults to "bydns:byaddr". If people want to use the other
5948     order, or indeed, just use one or the other means of lookup, they can
5949     specify it in this variable.
5950
5951  6. If a PTR record yields an empty name, Exim treats it as non-existent. In
5952     some operating systems, this comes back from gethostbyaddr() as an empty
5953     string, and this is what Exim used to test for. However, it seems that in
5954     other systems, "." is yielded. Exim now tests for this case too.
5955
5956  7. The values of check_spool_space and check_log_space are now held internally
5957     as a number of kilobytes instead of an absolute number of bytes. If a
5958     numbers is specified without 'K' or 'M', it is rounded up to the nearest
5959     kilobyte. This means that much larger values can be stored.
5960
5961  8. Exim monitor: an attempt to get the action menu when not actually pointing
5962     at a message produces an empty menu entitled "No message selected". This
5963     works on Solaris (OpenWindows). However, XFree86 does not like a menu with
5964     no entries in it ("Shell widget menu has zero width and/or height"). So I
5965     have added a single, blank menu entry in this case.
5966
5967  9. Added ${quote_local_part.
5968
5969 10. MIME decoding is now applied to the contents of Subject: header lines when
5970     they are logged.
5971
5972 11. Now that a reference to $sender_host_address automatically causes a reverse
5973     lookup to occur if necessary (4.13/18), there is no need to arrange for a
5974     host lookup before query-style lookups in lists that might use this
5975     variable. This has therefore been abolished, and the "net-" prefix is no
5976     longer necessary for query-style lookups.
5977
5978 12. The Makefile for SCO_SV contained a setting of LDFLAGS. This appears to
5979     have been a typo for LFLAGS, so it has been changed.
5980
5981 13. The install script calls Exim with "-C /dev/null" in order to find the
5982     version number. If ALT_CONFIG_PREFIX was set, this caused an error message
5983     to be output. However, since Exim outputs its version number before the
5984     error, it didn't break the script. It just looked ugly. I fixed this by
5985     always allowing "-C /dev/null" if the caller is root.
5986
5987 14. Ignore overlarge ACL variable number when reading spool file - insurance
5988     against a later release with more variables having written the file.
5989
5990 15. The standard form for an IPv6 address literal was being rejected by EHLO.
5991     Example: [IPv6:2002:c1ed:8229:10:202:2dff:fe07:a42a]. Exim now accepts
5992     this, as well as the form without the "IPv6" on the front.
5993
5994 16. Added CHOWN_COMMAND=/usr/sbin/chown and LIBS=-lresolv to the
5995     OS/Makefile-Darwin file.
5996
5997 17. Fixed typo in lookups/ldap.c: D_LOOKUP should be D_lookup. This applied
5998     only to LDAP libraries that do not have LDAP_OPT_DEREF.
5999
6000 18. After change 4.21/52, "%ld" was used to format the contents of the $inode
6001     variable. However, some OS use ints for inodes. I've added cast to long int
6002     to get rid of the compiler warning.
6003
6004 19. I had forgotten to lock out "/../" in configuration file names when
6005     ALT_CONFIG_PREFIX was set.
6006
6007 20. Routers used for verification do not need to specify transports. However,
6008     if such a router generated a host list, and callout was configured, Exim
6009     crashed, because it could not find a port number from the (non-existent)
6010     transport. It now assumes port 25 in this circumstance.
6011
6012 21. Added the -t option to exigrep.
6013
6014 22. If LOOKUP_LSEARCH is defined, all three linear search methods (lsearch,
6015     wildlsearch, nwildlsearch) are compiled. LOOKUP_WILDLSEARCH and LOOKUP_
6016     NWILDLSEARCH are now obsolete, but retained for compatibility. If either of
6017     them is set, LOOKUP_LSEARCH is forced.
6018
6019 23. "exim -bV" now outputs a list of lookups that are included in the binary.
6020
6021 24. Added sender and host information to the "rejected by local_scan()" log
6022     line; previously there was no indication of these.
6023
6024 25. Added .include_if_exists.
6025
6026 26. Change 3.952/11 added an explicit directory sync on top of a file sync for
6027     Linux. It turns out that not all file systems support this. Apparently some
6028     versions of NFS do not. (It's rare to put Exim's spool on NFS, but people
6029     do it.) To cope with this, the error EINVAL, which means that sync-ing is
6030     not supported on the file descriptor, is now ignored when Exim is trying to
6031     sync a directory. This applies only to Linux.
6032
6033 27. Added -DBIND_8_COMPAT to the CLFAGS setting for Darwin.
6034
6035 28. In Darwin (MacOS X), the PAM headers are in /usr/include/pam and not in
6036     /usr/include/security. There's now a flag in OS/os.h-Darwin to cope with
6037     this.
6038
6039 29. Added support for maildirsize files from supplied patch (modified a bit).
6040
6041 30. The use of :fail: followed by an empty string could lead Exim to respond to
6042     sender verification failures with (e.g.):
6043
6044       550 Verification failed for <xxx>
6045       550 Sender verify failed
6046
6047     where the first response line was missing the '-' that indicates it is not
6048     the final line of the response.
6049
6050 31. The loop for finding the name of the user that called Exim had a hardwired
6051     limit of 10; it now uses the value of finduser_retries, which is used for
6052     all other user lookups.
6053
6054 32. Added $received_count variable, available in data and not_smtp ACLs, and at
6055     delivery time.
6056
6057 33. Exim was neglecting to zero errno before one call of strtol() when
6058     expanding a string and expecting an integer value. On some systems this
6059     resulted in spurious "integer overflow" errors. Also, it was casting the
6060     result into an int without checking.
6061
6062 34. Testing for a connection timeout using "timeout_connect" in the retry rules
6063     did not work. The code looks as if it has *never* worked, though it appears
6064     to have been documented since at least release 1.62. I have made it work.
6065
6066 35. The "timeout_DNS" error in retry rules, also documented since at least
6067     1.62, also never worked. As it isn't clear exactly what this means, and
6068     clearly it isn't a major issue, I have abolished the feature by treating it
6069     as "timeout", and writing a warning to the main and panic logs.
6070
6071 36. The display of retry rules for -brt wasn't always showing the error code
6072     correctly.
6073
6074 37. Added new error conditions to retry rules: timeout_A, timeout_MX,
6075     timeout_connect_A, timeout_connect_MX.
6076
6077 38. Rewriting the envelope sender at SMTP time did not allow it to be rewritten
6078     to the empty sender.
6079
6080 39. The daemon was not analysing the content of -oX till after it had closed
6081     stderr and disconnected from the controlling terminal. This meant that any
6082     syntax errors were only noted on the panic log, and the return code from
6083     the command was 0. By re-arranging the code a little, I've made the
6084     decoding happen first, so such errors now appear on stderr, and the return
6085     code is 1. However, the actual setting up of the sockets still happens in
6086     the disconnected process, so errors there are still only recorded on the
6087     panic log.
6088
6089 40. A daemon listener on a wildcard IPv6 socket that also accepts IPv4
6090     connections (as happens on some IP stacks) was logged at start up time as
6091     just listening for IPv6. It now logs "IPv6 with IPv4". This differentiates
6092     it from "IPv6 and IPv4", which means that two separate sockets are being
6093     used.
6094
6095 41. The debug output for gethostbyname2() or getipnodebyname() failures now
6096     says whether AF_INET or AF_INET6 was passed as an argument.
6097
6098 42. Exiwhat output was messed up when time zones were included in log
6099     timestamps.
6100
6101 43. Exiwhat now gives more information about the daemon's listening ports,
6102     and whether -tls-on-connect was used.
6103
6104 44. The "port" option of the smtp transport is now expanded.
6105
6106 45. A "message" modifier in a "warn" statement in a non-message ACL was being
6107     silently ignored. Now an error message is written to the main and panic
6108     logs.
6109
6110 46. There's a new ACL modifier called "logwrite" which writes to a log file
6111     as soon as it is encountered.
6112
6113 47. Added $local_user_uid and $local_user_gid at routing time.
6114
6115 48. Exim crashed when trying to verify a sender address that was being
6116     rewritten to "<>".
6117
6118 49. Exim was recognizing only a space character after ".include". It now also
6119     recognizes a tab character.
6120
6121 50. Fixed several bugs in the Perl script that creates the exim.8 man page by
6122     extracting the relevant information from the specification. The man page no
6123     longer contains scrambled data for the -d option, and I've added a section
6124     at the front about calling Exim under different names.
6125
6126 51. Added "extra_headers" argument to the "mail" command in filter files.
6127
6128 52. Redirecting mail to an unqualified address in a Sieve filter caused Exim to
6129     crash.
6130
6131 53. Installed eximstats 1.29.
6132
6133 54. Added transport_filter_timeout as a generic transport option.
6134
6135 55. Exim no longer adds an empty Bcc: header to messages that have no To: or
6136     Cc: header lines. This was required by RFC 822, but it not required by RFC
6137     2822.
6138
6139 56. Exim used to add From:, Date:, and Message-Id: header lines to any
6140     incoming messages that did not have them. Now it does so only if the
6141     message originates locally, that is, if there is no associated remote host
6142     address. When Resent- header lines are present, this applies to the Resent-
6143     lines rather than the non-Resent- lines.
6144
6145 57. Drop incoming SMTP connection after too many syntax or protocol errors. The
6146     limit is controlled by smtp_max_synprot_errors, defaulting to 3.
6147
6148 58. Messages for configuration errors now include the name of the main
6149     configuration file - useful now that there may be more than one file in a
6150     list (.included file names were always shown).
6151
6152 59. Change 4.21/82 (run initgroups() when starting the daemon) causes problems
6153     for those rare installations that do not start the daemon as root or run it
6154     setuid root. I've cut out the call to initgroups() if the daemon is not
6155     root at that time.
6156
6157 60. The Exim user and group can now be bound into the binary as text strings
6158     that are looked up at the start of Exim's processing.
6159
6160 61. Applied a small patch for the Interbase code, supplied by Ard Biesheuvel.
6161
6162 62. Added $mailstore_basename variable.
6163
6164 63. Installed patch to sieve.c from Michael Haardt.
6165
6166 64. When Exim failed to open the panic log after failing to open the main log,
6167     the original message it was trying to log was written to stderr and debug
6168     output, but if they were not available (the usual case in production), it
6169     was lost. Now it is written to syslog before the two lines that record the
6170     failures to open the logs.
6171
6172 65. Users' Exim filters run in subprocesses under the user's uid. It is
6173     possible for a "deliver" command or an alias in a "personal" command to
6174     provoke an address rewrite. If logging of address rewriting is configured,
6175     this fails because the process is not running as root or exim. There may be
6176     a better way of dealing with this, but for the moment (because 4.30 needs
6177     to be released), I have disabled address rewrite logging when running a
6178     filter in a non-root, non-exim process.
6179
6180
6181 Exim version 4.24
6182 -----------------
6183
6184  1. The buildconfig auxiliary program wasn't quoting the value set for
6185     HEADERS_CHARSET. This caused a compilation error complaining that 'ISO' was
6186     not defined. This bug was masked in 4.22 by the effect that was fixed in
6187     change 4.23/1.
6188
6189  2. Some messages that were rejected after a message id was allocated were
6190     shown as "incomplete" by exigrep. It no longer does this for messages that
6191     are rejected by local_scan() or the DATA or non-SMTP ACLs.
6192
6193  3. If a Message-ID: header used a domain literal in the ID, and Exim did not
6194     have allow_domain_literals set, the ID did not get logged in the <= line.
6195     Domain literals are now always recognized in Message-ID: header lines.
6196
6197  4. The first argument for a ${extract expansion item is the key name or field
6198     number. Leading and trailing spaces in this item were not being ignored,
6199     causing some misleading effects.
6200
6201  5. When deliver_drop_privilege was set, single queue runner processes started
6202     manually (i.e. by the command "exim -q") or by the daemon (which uses the
6203     same command in the process it spins off) were not dropping privilege.
6204
6205  6. When the daemon running as "exim" started a queue runner, it always
6206     re-executed Exim in the spun-off process. This is a waste of effort when
6207     deliver_drop_privilege is set. The new process now just calls the
6208     queue-runner function directly.
6209
6210
6211 Exim version 4.23
6212 -----------------
6213
6214  1. Typo in the src/EDITME file: it referred to HEADERS_DECODE_TO instead of
6215     HEADERS_CHARSET.
6216
6217  2. Change 4.21/73 introduced a bug. The pid file path set by -oP was being
6218     ignored. Though the use of -oP was forcing the writing of a pid file, it
6219     was always written to the default place.
6220
6221  3. If the message "no IP address found for host xxxx" is generated during
6222     incoming verification, it is now followed by identification of the incoming
6223     connection (so you can more easily find what provoked it).
6224
6225  4. Bug fix for Sieve filters: "stop" inside a block was not working properly.
6226
6227  5. Added some features to "harden" Exim a bit more against certain attacks:
6228
6229     (a) There is now a build-time option called FIXED_NEVER_USERS that can
6230         be put in Local/Makefile. This is like the never_users runtime option,
6231         but it cannot be overridden. The default setting is "root".
6232
6233     (b) If ALT_CONFIG_PREFIX is defined in Local/Makefile, it specifies a
6234         prefix string with which any file named in a -C command line option
6235         must start.
6236
6237     (c) If ALT_CONFIG_ROOT_ONLY is defined in Local/Makefile, root privilege
6238         is retained for -C and -D only if the caller of Exim is root. Without
6239         it, the exim user may also use -C and -D and retain privilege.
6240
6241     (d) If DISABLE_D_OPTION is defined in Local/Makefile, the use of the -D
6242         command line option is disabled.
6243
6244  6. Macro names set by the -D option must start with an upper case letter, just
6245     like macro names defined in the configuration file.
6246
6247  7. Added "dereference=" facility to LDAP.
6248
6249  8. Two instances of the typo "uknown" in the source files are fixed.
6250
6251  9. If a PERL_COMMAND setting in Local/Makefile was not at the start of a line,
6252     the Configure-Makefile script screwed up while processing it.
6253
6254 10. Incorporated PCRE 4.4.
6255
6256 11. The SMTP synchronization check was not operating right at the start of an
6257     SMTP session. For example, it could not catch a HELO sent before the client
6258     waited for the greeting. There is now a check for outstanding input at the
6259     point when the greeting is written. Because of the duplex, asynchronous
6260     nature of TCP/IP, it cannot be perfect - the incorrect input may be on its
6261     way, but not yet received, when the check is performed.
6262
6263 12. Added tcp_nodelay to make it possible to turn of the setting of TCP_NODELAY
6264     on TCP/IP sockets, because this apparently causes some broken clients to
6265     timeout.
6266
6267 13. Installed revised OS/Makefile-CYGWIN and OS/os.c-cygwin (the .h file was
6268     unchanged) from the Cygwin maintainer.
6269
6270 14. The code for -bV that shows what is in the binary showed "mbx" when maildir
6271     was supported instead of testing for mbx. Effectively a typo.
6272
6273 15. The spa authenticator server code was not checking that the input it
6274     received was valid base64.
6275
6276 16. The debug output line for the "set" modifier in ACLs was not showing the
6277     name of the variable that was being set.
6278
6279 17. Code tidy: the variable type "vtype_string" was never used. Removed it.
6280
6281 18. Previously, a reference to $sender_host_name did not cause a DNS reverse
6282     lookup on its own. Something else was needed to trigger the lookup. For
6283     example, a match in host_lookup or the need for a host name in a host list.
6284     Now, if $sender_host_name is referenced and the host name has not yet been
6285     looked up, a lookup is performed. If the lookup fails, the variable remains
6286     empty, and $host_lookup_failed is set to "1".
6287
6288 19. Added "eqi" as a case-independent comparison operator.
6289
6290 20. The saslauthd authentication condition could segfault if neither service
6291     nor realm was specified.
6292
6293 21. If an overflowing value such as "2048M" was set for message_size_limit, the
6294     error message that was logged was misleading, and incoming SMTP
6295     connections were dropped. The message is now more accurate, and temporary
6296     errors are given to SMTP connections.
6297
6298 22. In some error situations (such as 21 above) Exim rejects all SMTP commands
6299     (except RSET) with a 421 error, until QUIT is received. However, it was
6300     failing to send a response to QUIT.
6301
6302 23. The HELO ACL was being run before the code for helo_try_verify_hosts,
6303     which made it impossible to use "verify = helo" in the HELO ACL. The HELO
6304     ACL is now run after the helo_try_verify_hosts code.
6305
6306 24. "{MD5}" and "{SHA1}" are now recognized as equivalent to "{md5"} and
6307     "{sha1}" in the "crypteq" expansion condition (in fact the comparison is
6308     case-independent, so other case variants are also recognized). Apparently
6309     some systems use these upper case variants.
6310
6311 25. If more than two messages were waiting for the same host, and a transport
6312     filter was specified for the transport, Exim sent two messages over the
6313     same TCP/IP connection, and then failed with "socket operation on non-
6314     socket" when it tried to send the third.
6315
6316 26. Added Exim::debug_write and Exim::log_write for embedded Perl use.
6317
6318 27. The extern definition of crypt16() in expand.c was not being excluded when
6319     the OS had its own crypt16() function.
6320
6321 28. Added bounce_return_body as a new option, and bounce_return_size_limit
6322     as a preferred synonym for return_size_limit, both as an option and as an
6323     expansion variable.
6324
6325 29. Added LIBS=-liconv to OS/Makefile-OSF1.
6326
6327 30. Changed the default configuration ACL to relax the local part checking rule
6328     for addresses that are not in any local domains. For these addresses,
6329     slashes and pipe symbols are allowed within local parts, but the sequence
6330     /../ is explicitly forbidden.
6331
6332 31. SPA server authentication was not clearing the challenge buffer before
6333     using it.
6334
6335 32. log_message in a "warn" ACL statement was writing to the reject log as
6336     well as to the main log, which contradicts the documentation and doesn't
6337     seem right (because no rejection is happening). So I have stopped it.
6338
6339 33. Added Ard Biesheuvel's lookup code for accessing an Interbase database.
6340     However, I am unable to do any testing of this.
6341
6342 34. Fixed an infelicity in the appendfile transport. When checking directories
6343     for a mailbox, to see if any needed to be created, it was accidentally
6344     using path names with one or more superfluous leading slashes; tracing
6345     would show up entries such as stat("///home/ph10", 0xFFBEEA48).
6346
6347 35. If log_message is set on a "discard" verb in a MAIL or RCPT ACL, its
6348     contents are added to the log line that is written for every discarded
6349     recipient. (Previously a log_message setting was ignored.)
6350
6351 36. The ${quote: operator now quotes the string if it is empty.
6352
6353 37. The install script runs exim in order to find its version number. If for
6354     some reason other than non-existence or emptiness, which it checks, it
6355     could not run './exim', it was installing it with an empty version number,
6356     i.e. as "exim-". This error state is now caught, and the installation is
6357     aborted.
6358
6359 38. An argument was missing from the function that creates an error message
6360     when Exim fails to connect to the socket for saslauthd authentication.
6361     This could cause Exim to crash, or give a corrupted message.
6362
6363 39. Added isip, isip4, and isip6 to ${if conditions.
6364
6365 40. The ACL variables $acl_xx are now saved with the message, and can be
6366     accessed later in routers, transports, and filters.
6367
6368 41. The new lookup type nwildlsearch is like wildlsearch, except that the key
6369     strings in the file are not string-expanded.
6370
6371 42. If a MAIL command specified a SIZE value that was too large to fit into an
6372     int variable, the check against message_size_limit failed. Such values are
6373     now forced to INT_MAX, which is around 2Gb for a 32-bit variable. Maybe one
6374     day this will have to be increased, but I don't think I want to be around
6375     when emails are that large.
6376
6377
6378
6379 Exim version 4.22
6380 -----------------
6381
6382  1. Removed HAVE_ICONV=yes from OS/Makefile-FreeBSD, since it seems that
6383     iconv() is not standard in FreeBSD.
6384
6385  2. Change 4.21/17 was buggy and could cause stack overwriting on a system with
6386     IPv6 enabled. The observed symptom was a segmentation fault on return from
6387     the function os_common_find_running_interfaces() in src/os.c.
6388
6389  3. In the check_special_case() function in daemon.c I had used "errno" as an
6390     argument name, which causes warnings on some systems. This was basically a
6391     typo, since it was named "eno" in the comments!
6392
6393  4. The code that waits for the clock to tick (at a resolution of some fraction
6394     of a second) so as to ensure message-id uniqueness was always waiting for
6395     at least one whole tick, when it could have waited for less. [This is
6396     almost certainly not relevant at current processor speeds, where it is
6397     unlikely to ever wait at all. But we try to future-proof.]
6398
6399  5. The function that sleeps for a time interval that includes fractions of a
6400     second contained a race. It did not block SIGALRM between setting the
6401     timer, and suspending (a couple of lines later). If the interval was short
6402     and the sigsuspend() was delayed until after it had expired, the suspension
6403     never ended. On busy systems this could lead to processes getting stuck for
6404     ever.
6405
6406  6. Some uncommon configurations may cause a lookup to happen in a queue runner
6407     process, before it forks any delivery processes. The open lookup caching
6408     mechanism meant that the open file or database connection was passed into
6409     the delivery process. The problem was that delivery processes always tidy
6410     up cached lookup data. This could cause a problem for the next delivery
6411     process started by the queue runner, because the external queue runner
6412     process does not know about the closure. So the next delivery process
6413     still has data in the lookup cache. In the case of a file lookup, there was
6414     no problem because closing a file descriptor in a subprocess doesn't affect
6415     the parent. However, if the lookup was caching a connection to a database,
6416     the connection was closed, and the second delivery process was likely to
6417     see errors such as "PGSQL: query failed: server closed the connection
6418     unexpectedly". The problem has been fixed by closing all cached lookups
6419     in a queue runner before running a delivery process.
6420
6421  7. Compiler warning on Linux for the second argument of iconv(), which doesn't
6422     seem to have the "const" qualifier which it has on other OS. I've
6423     parameterised it.
6424
6425  8. Change 4.21/2 was too strict. It is only if there are two authenticators
6426     *of the same type* (client or server) with the same public name that an
6427     error should be diagnosed.
6428
6429  9. When Exim looked up a host name for an IP address, but failed to find the
6430     original IP address when looking up the host name (a safety check), it
6431     output the message "<ip address> does not match any IP for NULL", which was
6432     confusing, to say the least. The bug was that the host name should have
6433     appeared instead of "NULL".
6434
6435 10. Since release 3.03, if Exim is called by a uid other than root or the Exim
6436     user that is built into the binary, and the -C or -D options is used, root
6437     privilege is dropped before the configuration file is read. In addition,
6438     logging is switched to stderr instead of the normal log files. If the
6439     configuration then re-defines the Exim user, the unprivileged environment
6440     is probably not what is expected, so Exim logs a panic warning message (but
6441     proceeds).
6442
6443     However, if deliver_drop_privilege is set, the unprivileged state may well
6444     be exactly what is intended, so the warning has been cut out in that case,
6445     and Exim is allowed to try to write to its normal log files.
6446
6447
6448 Exim version 4.21
6449 -----------------
6450
6451  1. smtp_return_error_details was not giving details for temporary sender
6452     or receiver verification errors.
6453
6454  2. Diagnose a configuration error if two authenticators have the same public
6455     name.
6456
6457  3. Exim used not to create the message log file for a message until the first
6458     delivery attempt. This could be confusing when incoming messages were held
6459     for policy or load reasons. The message log file is now created at the time
6460     the message is received, and an initial "Received" line is written to it.
6461
6462  4. The automatically generated man page for command line options had a minor
6463     bug that caused no ill effects; however, a more serious problem was that
6464     the procedure for building the man page automatically didn't always
6465     operate. Consequently, release 4.20 contains an out-of-date version. This
6466     shouldn't happen again.
6467
6468  5. When building Exim with embedded Perl support, the script that builds the
6469     Makefile was calling 'perl' to find its compile-time parameters, ignoring
6470     any setting of PERL_COMMAND in Local/Makefile. This is now fixed.
6471
6472  6. The freeze_tell option was not being used for messages that were frozen on
6473     arrival, either by an ACL or by local_scan().
6474
6475  7. Added the smtp_incomplete_transaction log selector.
6476
6477  8. After STARTTLS, Exim was not forgetting that it had advertised AUTH, so it
6478     was accepting AUTH without a new EHLO.
6479
6480  9. Added tls_remember_esmtp to cope with YAEB. This allows AUTH and other
6481     ESMTP extensions after STARTTLS without a new EHLO, in contravention of the
6482     RFC.
6483
6484 10. Logging of TCP/IP connections (when configured) now happens in the main
6485     daemon process instead of the child process, so that the TCP/IP connection
6486     count is more accurate (but it can never be perfect).
6487
6488 11. The use of "drop" in a nested ACL was not being handled correctly in the
6489     outer ACL. Now, if condition failure induced by the nested "drop" causes
6490     the outer ACL verb to deny access ("accept" or "discard" after "endpass",
6491     or "require"), the connection is dropped.
6492
6493 12. Similarly, "discard" in a nested ACL wasn't being handled. A nested ACL
6494     that yield "discard" can now be used with an "accept" or a "discard" verb,
6495     but an error is generated for any others (because I can't see a useful way
6496     to define what should happen).
6497
6498 13. When an ACL is read dynamically from a file (or anywhere else), the lines
6499     are now processed in the same way as lines in the Exim configuration file.
6500     In particular, continuation lines are supported.
6501
6502 14. Added the "dnslists = a.b.c!=n.n.n.n" feature.
6503
6504 15. Added -ti meaning -t -i.
6505
6506 16. Check for letters, digits, hyphens, and dots in the names of dnslist
6507     domains, and warn by logging if others are found.
6508
6509 17. At least on BSD, alignment is not guaranteed for the array of ifreq's
6510     returned from GIFCONF when Exim is trying to find the list of interfaces on
6511     a host. The code in os.c has been modified to copy each ifreq to an aligned
6512     structure in all cases.
6513
6514     Also, in some cases, the returned ifreq's were being copied to a 'struct
6515     ifreq' on the stack, which was subsequently passed to host_ntoa(). That
6516     means the last couple of bytes of an IPv6 address could be chopped if the
6517     ifreq contained only a normal sockaddr (14 bytes storage).
6518
6519 18. Named domain lists were not supported in the hosts_treat_as_local option.
6520     An entry such as +xxxx was not recognized, and was treated as a literal
6521     domain name.
6522
6523 19. Ensure that header lines added by a DATA ACL are included in the reject log
6524     if the ACL subsequently rejects the message.
6525
6526 20. Upgrade the cramtest.pl utility script to use Digest::MD5 instead of just
6527     MD5 (which is deprecated).
6528
6529 21. When testing a filter file using -bf, Exim was writing a message when it
6530     took the sender from a "From " line in the message, but it was not doing so
6531     when it took $return_path from a Return-Path: header line. It now does.
6532
6533 22. If the contents of a "message" modifier for a "warn" ACL verb do not begin
6534     with a valid header line field name (a series of printing characters
6535     terminated by a colon, Exim now inserts X-ACL-Warn: at the beginning.
6536
6537 23. Changed "disc" in the source to "disk" to conform to the documentation and
6538     the book and for uniformity.
6539
6540 24. Ignore Sendmail's -Ooption=value command line item.
6541
6542 25. When execve() failed while trying to run a command in a pipe transport,
6543     Exim was returning EX_UNAVAILABLE (69) from the subprocess. However, this
6544     could be confused with a return value of 69 from the command itself. This
6545     has been changed to 127, the value the shell returns if it is asked to run
6546     a non-existent command. The wording for the related log line suggests a
6547     non-existent command as the problem.
6548
6549 26. If received_header_text expands to an empty string, do not add a Received:
6550     header line to the message. (Well, it adds a token one on the spool, but
6551     marks it "old" so that it doesn't get used or transmitted.)
6552
6553 27. Installed eximstats 1.28 (addition of -nt option).
6554
6555 28. There was no check for failure on the call to getsockname() in the daemon
6556     code. This can fail if there is a shortage of resources on the system, with
6557     ENOMEM, for example. A temporary error is now given on failure.
6558
6559 29. Contrary to the C standard, it seems that in some environments, the
6560     equivalent of setlocale(LC_ALL, "C") is not obeyed at the start of a C
6561     program. Exim now does this explicitly; it affects the formatting of
6562     timestamps using strftime().
6563
6564 30. If exiqsumm was given junk data, it threw up some uninitialized variable
6565     complaints. I've now initialized all the variables, to avoid this.
6566
6567 32. Header lines added by a system filter were not being "seen" during
6568     transport-time rewrites.
6569
6570 33. The info_callback() function passed to OpenSSL is set up with type void
6571     (*)(SSL *, int, int), as described somewhere. However, when calling the
6572     function (actually a macro) that sets it up, the type void(*)() is
6573     expected. I've put in a cast to prevent warnings from picky compilers.
6574
6575 34. If a DNS black list lookup found a CNAME record, but there were no A
6576     records associated with the domain it pointed at, Exim crashed.
6577
6578 35. If a DNS black list lookup returned more than one A record, Exim ignored
6579     all but the first. It now scans all returned addresses if a particular IP
6580     value is being sought. In this situation, the contents of the
6581     $dnslist_value variable are a list of all the addresses, separated by a
6582     comma and a space.
6583
6584 36. Tightened up the rules for host name lookups using reverse DNS. Exim used
6585     to accept a host name and all its aliases if the forward lookup for any of
6586     them yielded the IP address of the incoming connection. Now it accepts only
6587     those names whose forward lookup yields the correct IP address. Any other
6588     names are discarded. This closes a loophole whereby a rogue DNS
6589     administrator could create reverse DNS records to break through a
6590     wildcarded host restriction in an ACL.
6591
6592 37. If a user filter or a system filter that ran in a subprocess used any of
6593     the numerical variables ($1, $2 etc), or $thisaddress, in a pipe command,
6594     the wrong values were passed to the pipe command ($thisaddress had the
6595     value of $0, $0 had the value of $1, etc). This bug was introduced by
6596     change 4.11/101, and not discovered because I wrote an inadequate test. :-(
6597
6598 38. Improved the line breaking for long SMTP error messages from ACLs.
6599     Previously, if there was no break point between 40 and 75 characters, Exim
6600     left the rest of the message alone. Two changes have been made: (a) I've
6601     reduced the minimum length to 35 characters; (b) if it can't find a break
6602     point between 35 and 75 characters, it looks ahead and uses the first one
6603     that it finds. This may give the occasional overlong line, but at least the
6604     remaining text gets split now.
6605
6606 39. Change 82 of 4.11 was unimaginative. It assumed the limit on the number of
6607     file descriptors might be low, and that setting 1000 would always raise it.
6608     It turns out that in some environments, the limit is already over 1000 and
6609     that lowering it causes trouble. So now Exim takes care not to decrease it.
6610
6611 40. When delivering a message, the value of $return_path is set to $sender_
6612     address at the start of routing (routers may change the value). By an
6613     oversight, this default was not being set up when an address was tested by
6614     -bt or -bv, which affected the outcome if any router or filter referred to
6615     $return_path.
6616
6617 41. The idea of the "warn" ACL verb is that it adds a header or writes to the
6618     log only when "message" or "log_message" are set. However, if one of the
6619     conditions was an address verification, or a call to a nested ACL, the
6620     messages generated by the underlying test were being passed through. This
6621     no longer happens. The underlying message is available in $acl_verify_
6622     message for both "message" and "log_message" expansions, so it can be
6623     passed through if needed.
6624
6625 42. Added RFC 2047 interpretation of header lines for $h_ expansions, with a
6626     new expansion $bh_ to give the encoded byte string without charset
6627     translation. Translation happens only if iconv() is available; HAVE_ICONV
6628     indicates this at build time. HEADERS_CHARSET gives the charset to
6629     translate to; headers_charset can change it in the configuration, and
6630     "headers charset" can change it in an individual filter file.
6631
6632 43. Now that we have a default RFC 2047 charset (see above), the code in Exim
6633     that creates RFC 2047 encoded "words" labels them as that charset instead
6634     of always using iso-8859-1. The cases are (i) the explicit ${rfc2047:
6635     expansion operator; (ii) when Exim creates a From: line for a local
6636     message; (iii) when a header line is rewritten to include a "phrase" part.
6637
6638 44. Nasty bug in exiqsumm: the regex to skip already-delivered addresses was
6639     buggy, causing it to skip the first lines of messages whose message ID
6640     ended in 'D'. This would not have bitten before Exim release 4.14, because
6641     message IDs were unlikely to end in 'D' before then. The effect was to have
6642     incorrect size information for certain domains.
6643
6644 45. #include "config.h" was missing at the start of the crypt16.c module. This
6645     caused trouble on Tru64 (aka OSF1) systems, because HAVE_CRYPT16 was not
6646     noticed.
6647
6648 46. If there was a timeout during a "random" callout check, Exim treated it as
6649     a failure of the random address, and carried on sending RSET and the real
6650     address. If the delay was just some slowness somewhere, the response to the
6651     original RCPT would be taken as a response to RSET and so on, causing
6652     mayhem of various kinds.
6653
6654 47. Change 50 for 4.20 was a heap of junk. I don't know what I was thinking
6655     when I implemented it. It didn't allow for the fact that some option values
6656     may legitimately be negative (e.g. size_addition), and it didn't even do
6657     the right test for positive values.
6658
6659 48. Domain names in DNS records are case-independent. Exim always looks them up
6660     in lower case. Some resolvers return domain names in exactly the case they
6661     appear in the zone file, that is, they may contain uppercase letters. Not
6662     all resolvers do this - some return always lower case. Exim was treating a
6663     change of case by a resolver as a change of domain, similar to a widening
6664     of a domain abbreviation. This triggered its re-routing code and so it was
6665     trying to route what was effectively the same domain again. This normally
6666     caused routing to fail (because the router wouldn't handle the domain
6667     twice). Now Exim checks for this case specially, and just changes the
6668     casing of the domain that it ultimately uses when it transmits the message
6669     envelope.
6670
6671 49. Added Sieve (RFC 3028) support, courtesy of Michael Haardt's contributed
6672     module.
6673
6674 50. If a filter generated a file delivery with a non-absolute name (possible if
6675     no home directory exists for the router), the forbid_file option was not
6676     forbidding it.
6677
6678 51. Added '&' feature to dnslists, to provide bit mask matching in addition to
6679     the existing equality matching.
6680
6681 52. Exim was using ints instead of ino_t variables in some places where it was
6682     dealing with inode numbers.
6683
6684 53. If TMPDIR is defined in Local/Makefile (default in src/EDITME is
6685     TMPDIR="/tmp"), Exim checks for the presence of an environment variable
6686     called TMPDIR, and if it finds it is different, it changes its value.
6687
6688 54. The smtp_printf() function is now made available to local_scan() so
6689     additional output lines can be written before returning. There is also an
6690     smtp_fflush() function to enable the detection of a dropped connection.
6691     The variables smtp_input and smtp_batched_input are exported to
6692     local_scan().
6693
6694 55. Changed the default runtime configuration: the message "Unknown user"
6695     has been removed from the ACL, and instead placed on the localuser router,
6696     using the cannot_route_message feature. This means that any verification
6697     failures that generate their own messages won't get overridden. Similarly,
6698     the "Unrouteable address" message that was in the ACL for unverifiable
6699     relay addresses has also been removed.
6700
6701 56. Added hosts_avoid_esmtp to the smtp transport.
6702
6703 57. The exicyclog script was not checking for the esoteric option
6704     CONFIGURE_FILE_USE_EUID in the Local/Makefile. It now does this, but it
6705     will work only if exicyclog is run under the appropriate euid.
6706
6707 58. Following a discussion on the list, the rules by which Exim recognises line
6708     endings on incoming messages have been changed. The -dropcr and drop_cr
6709     options are now no-ops, retained only for backwards compatibility. The
6710     following line terminators are recognized: LF CRLF CR. However, special
6711     processing applies to CR:
6712
6713     (i)  The sequence CR . CR does *not* terminate an incoming SMTP message,
6714          nor a local message in the state where . is a terminator.
6715
6716     (ii) If a bare CR is encountered in a header line, an extra space is added
6717          after the line terminator so as not to end the header. The reasoning
6718          behind this is that bare CRs in header lines are most likely either
6719          to be mistakes, or people trying to play silly games.
6720
6721 59. The size of a message, as listed by "-bp" or in the Exim monitor window,
6722     was being incorrectly given as 18 bytes larger than it should have been.
6723     This is a VOB (very old bug).
6724
6725 60. This may never have affected anything current, but just in case it has:
6726     When the local host is found other than at the start of a list of hosts,
6727     the local host, those with the same MX, and any that follow, are discarded.
6728     When the list in question was part of a longer list of hosts, the following
6729     hosts (not currently being processed) were also being discarded. This no
6730     longer happens. I'm not sure if this situation could ever has previously
6731     arisen.
6732
6733 61. Added the "/MX" feature to lists of hosts in the manualroute and query
6734     program routers.
6735
6736 62. Whenever Exim generates a new message, it now adds an Auto-Submitted:
6737     header. This is something that is recommended in a new Internet Draft, and
6738     is something that is documented as being done by Sendmail. There are two
6739     possible values. For messages generated by the autoreply transport, Exim
6740     adds:
6741
6742       Auto-Submitted: auto-replied
6743
6744     whereas for all other generated messages (e.g. bounces) it adds
6745
6746       Auto-Submitted: auto-generated
6747
6748 63. The "personal" condition in filters now includes a test for the
6749     Auto-Submitted: header. If it contains the string "auto-" the message it
6750     not considered personal.
6751
6752 64. Added rcpt_include_affixes as a generic transport option.
6753
6754 65. Added queue_only_override (default true).
6755
6756 66. Added the syslog_duplication option.
6757
6758 67. If what should have been the first header line of a message consisted of
6759     a space followed by a colon, Exim was mis-interpreting it as a header line.
6760     It isn't of course - it is syntactically invalid and should therefore be
6761     treated as the start of the message body. The misbehaviour could have
6762     caused a number of strange effects, including loss of data in subsequent
6763     header lines, and spool format errors.
6764
6765 68. Formerly, the AUTH parameter on a MAIL command was trusted only if the
6766     client host had authenticated. This control can now be exercised by an ACL
6767     for more flexibility.
6768
6769 69. By default, callouts do not happen when testing with -bh. There is now a
6770     variant, -bhc, which does actually run the callout code, including
6771     consulting and updating the callout cache.
6772
6773 70. Added support for saslauthd authentication, courtesy of Alexander
6774     Sabourenkov.
6775
6776 71. If statvfs() failed on the spool or log directories while checking their
6777     size for availability, Exim confusingly gave the error "space shortage".
6778     Furthermore, in debugging mode it crashed with a floating point exception.
6779     These checks are done if check_{spool,log}_{space,inodes} are set, and when
6780     an SMTP message arrives with SIZE= on the MAIL command. As this is a really
6781     serious problem, Exim now writes to the main and panic logs when this
6782     happens, with details of the failure. It then refuses to accept the
6783     incoming message, giving the message "spool directory problem" or "log
6784     directory problem" with a 421 code for SMTP messages.
6785
6786 72. When Exim is about to re-exec itself, it ensures that the file descriptors
6787     0, 1, and 2 exist, because some OS complain for execs without them (see
6788     ChangeLog 4.05/30). If necessary, Exim opens /dev/null to use for these
6789     descriptors. However, the code omitted to check that the open succeeded,
6790     causing mysterious errors if for some reason the permissions on /dev/null
6791     got screwed. Now Exim writes a message to the main and panic logs, and
6792     bombs out if it can't open /dev/null.
6793
6794 73. Re-vamped the way daemon_smtp_port, local_interfaces, and -oX work and
6795     interact so that it is all more flexible. It is supposed to remain
6796     backwards compatible. Also added extra_local_interfaces.
6797
6798 74. Invalid data sent to a SPA (NTLM) server authenticator could cause the code
6799     to bomb out with an assertion failure - to the client this appears as a
6800     connection drop. This problem occurs in the part of the code that was taken
6801     from the Samba project. Fortunately, the assertion is in a very simple
6802     function, so I have fixed this by reproducing the function inline in the
6803     one place where it is called, and arranging for authentication to fail
6804     instead of killing the process with assert().
6805
6806 75. The SPA client code was not working when the server requested OEM rather
6807     than Unicode encoding.
6808
6809 76. Added code to make require_files with a specific uid setting more usable in
6810     the case where statting the file as root fails - usually a non-root-mounted
6811     NFS file system. When this happens and the failure is EACCES, Exim now
6812     forks a subprocess and does the per-uid checking as the relevant uid.
6813
6814 77. Added process_log_path.
6815
6816 78. If log_file_path was not explicitly set, a setting of check_log_space or
6817     check_log_inodes was ignored.
6818
6819 79. If a space check for the spool or log partitions fails, the incident is now
6820     logged. Of course, in the latter case the data may get lost...
6821
6822 80. Added the %p formatting code to string_format() so that it can be used to
6823     print addresses in debug_print(). Adjusted all the address printing in the
6824     debugging in store.c to use %p rather than %d.
6825
6826 81. There was a concern that a line of code in smtp_in.c could overflow a
6827     buffer if a HELO/EHLO command was given followed by 500 or so spaces. As
6828     initially expressed, the concern was not well-founded, because trailing
6829     spaces are removed early. However, if the trailing spaces were followed by
6830     a NULL, they did not get removed, so the overflow was possible. Two fixes
6831     were applied:
6832
6833     (a) I re-wrote the offending code in a cleaner fashion.
6834     (b) If an incoming SMTP command contains a NULL character, it is rejected
6835         as invalid.
6836
6837 82. When Exim changes uid/gid to the Exim user at daemon start time, it now
6838     runs initgroups(), so that if the Exim user is in any additional groups,
6839     they will be used during message reception.
6840
6841
6842 Exim version 4.20
6843 -----------------
6844
6845 The change log for 4.20 and earlier releases has been archived.
6846
6847 ****