[exim.git] / doc / doc-txt / ChangeLog

Change log file for Exim from version 4.21
-------------------------------------------


Exim version 4.84
-----------------
TL/01 Bugzilla 1506: Re-add a 'return NULL' to silence complaints from static
      checkers that were complaining about end of non-void function with no
      return.


Exim version 4.83
-----------------

TF/01 Correctly close the server side of TLS when forking for delivery.

      When a message was received over SMTP with TLS, Exim failed to clear up
      the incoming connection properly after forking off the child process to
      deliver the message. In some situations the subsequent outgoing
      delivery connection happened to have the same fd number as the incoming
      connection previously had. Exim would try to use TLS and fail, logging
      a "Bad file descriptor" error.

TF/02 Portability fix for building lookup modules on Solaris when the xpg4
      utilities have not been installed.

JH/01 Fix memory-handling in use of acl as a conditional; avoid free of
      temporary space as the ACL may create new global variables.

TL/01 LDAP support uses per connection or global context settings, depending
      upon the detected version of the libraries at build time.

TL/02 Experimental Proxy Protocol support: allows a proxied SMTP connection
      to extract and use the src ip:port in logging and expansions as if it
      were a direct connection from the outside internet. PPv2 support was
      updated based on HAProxy spec change in May 2014.

JH/02 Add ${listextract {number}{list}{success}{fail}}.

TL/03 Bugzilla 1433: Fix DMARC SEGV with specific From header contents.
      Properly escape header and check for NULL return.

PP/01 Continue incomplete 4.82 PP/19 by fixing docs too: use dns_dnssec_ok
      not dns_use_dnssec.

JH/03 Bugzilla 1157: support log_selector smtp_confirmation for lmtp.

TL/04 Add verify = header_names_ascii check to reject email with non-ASCII
      characters in header names, implemented as a verify condition.
      Contributed by Michael Fischer v. Mollard.

TL/05 Rename SPF condition results err_perm and err_temp to standardized
      results permerror and temperror.  Previous values are deprecated but
      still accepted.  In a future release, err_perm and err_temp will be
      completely removed, which will be a backward incompatibility if the
      ACL tests for either of these two old results. Patch contributed by
      user bes-internal on the mailing list.

JH/04 Add ${utf8clean:} operator. Contributed by Alex Rau.

JH/05 Bugzilla 305: Log incoming-TLS details on rejects, subject to log
      selectors, in both main and reject logs.

JH/06 Log outbound-TLS and port details, subject to log selectors, for a
      failed delivery.

JH/07 Add malware type "sock" for talking to simple daemon.

JH/08 Bugzilla 1371: Add tls_{,try_}verify_hosts to smtp transport.

JH/09 Bugzilla 1431: Support (with limitations) headers_add/headers_remove in
      routers/transports under cutthrough routing.

JH/10 Bugzilla 1005: ACL "condition =" should accept values which are negative
      numbers.  Touch up "bool" conditional to keep the same definition.

TL/06 Remove duplicated language in spec file from 4.82 TL/16.

JH/11 Add dnsdb tlsa lookup.  From Todd Lyons.

JH/12 Expand items in router/transport headers_add or headers_remove lists
      individually rather than the list as a whole.  Bug 1452.

      Required for reasonable handling of multiple headers_ options when
      they may be empty; requires that headers_remove items with embedded
      colons must have them doubled (or the list-separator changed).

TL/07 Add new dmarc expansion variable $dmarc_domain_policy to directly
      view the policy declared in the DMARC record. Currently, $dmarc_status
      is a combined value of both the record presence and the result of the
      analysis.

JH/13 Fix handling of $tls_cipher et.al. in (non-verify) transport.  Bug 1455.

JH/14 New options dnssec_request_domains, dnssec_require_domains on the
      dnslookup router and the smtp transport (applying to the forward
      lookup).

TL/08 Bugzilla 1453: New LDAP "SERVERS=" option allows admin to override list
      of ldap servers used for a specific lookup.  Patch provided by Heiko
      Schlichting.

JH/18 New options dnssec_lax, dnssec_strict on dnsdb lookups.
      New variable $lookup_dnssec_authenticated for observability.

TL/09 Bugzilla 609: Add -C option to exiqgrep, specify which exim.conf to use.
      Patch submitted by Lars Timman.

JH/19 EXPERIMENTAL_OCSP support under GnuTLS.  Bug 1459.

TL/10 Bugzilla 1454: New -oMm option to pass message reference to Exim.
      Requires trusted mode and valid format message id, aborts otherwise.
      Patch contributed by Heiko Schlichting.

JH/20 New expansion variables tls_(in,out)_(our,peer)cert, and expansion item
      certextract with support for various fields.  Bug 1358.

JH/21 Observability of OCSP via variables tls_(in,out)_ocsp.  Stapling
      is requested by default, modifiable by smtp transport option
      hosts_request_ocsp.

JH/22 Expansion operators ${md5:string} and ${sha1:string} can now
      operate on certificate variables to give certificate fingerprints
      Also new ${sha256:cert_variable}.

JH/23 The PRDR feature is moved from being Experimental into the mainline.

TL/11 Bug 1119: fix memory allocation in string_printing2().  Patch from
      Christian Aistleitner.

JH/24 The OCSP stapling feature is moved from Experimental into the mainline.

TL/12 Bug 1444: Fix improper \r\n sequence handling when writing spool
      file.  Patch from Wolfgang Breyha.

JH/25 Expand the coverage of the delivery $host and $host_address to
      client authenticators run in verify callout.  Bug 1476.

JH/26 Port service names are now accepted for tls_on_connect_ports, to
      align with daemon_smtp_ports.  Bug 72.

TF/03 Fix udpsend. The ip_connectedsocket() function's socket type
      support and error reporting did not work properly.

TL/13 Bug 1495: Exiqgrep check if -C config file specified on cli exists
      and is readable.  Patch from Andrew Colin Kissa.

TL/14 Enhance documentation of ${run expansion and how it parses the
      commandline after expansion, particularly in the case when an
      unquoted variable expansion results in an empty value.

JH/27 The TLS SNI feature was broken in 4.82.  Fix it.

PP/02 Fix internal collision of T_APL on systems which support RFC3123
      by renaming away from it.  Addresses GH issue 15, reported by
      Jasper Wallace.

JH/28 Fix parsing of MIME headers for parameters with quoted semicolons.

TL/15 SECURITY: prevent double expansion in math comparison functions
      (can expand unsanitized data). Not remotely exploitable.
      CVE-2014-2972


Exim version 4.82
-----------------

PP/01 Add -bI: framework, and -bI:sieve for querying sieve capabilities.

PP/02 Make -n do something, by making it not do something.
      When combined with -bP, the name of an option is not output.

PP/03 Added tls_dh_min_bits SMTP transport driver option, only honoured
      by GnuTLS.

PP/04 First step towards DNSSEC, provide $sender_host_dnssec for
      $sender_host_name and config options to manage this, and basic check
      routines.

PP/05 DSCP support for outbound connections and control modifier for inbound.

PP/06 Cyrus SASL: set local and remote IP;port properties for driver.
      (Only plugin which currently uses this is kerberos4, which nobody should
      be using, but we should make it available and other future plugins might
      conceivably use it, even though it would break NAT; stuff *should* be
      using channel bindings instead).

PP/07 Handle "exim -L <tag>" to indicate to use syslog with tag as the process
      name; added for Sendmail compatibility; requires admin caller.
      Handle -G as equivalent to "control = suppress_local_fixups" (we used to
      just ignore it); requires trusted caller.
      Also parse but ignore: -Ac -Am -X<logfile>
      Bugzilla 1117.

TL/01 Bugzilla 1258 - Refactor MAIL FROM optional args processing.

TL/02 Add +smtp_confirmation as a default logging option.

TL/03 Bugzilla 198 - Implement remove_header ACL modifier.
      Patch by Magnus Holmgren from 2007-02-20.

TL/04 Bugzilla 1281 - Spec typo.
      Bugzilla 1283 - Spec typo.
      Bugzilla 1290 - Spec grammar fixes.

TL/05 Bugzilla 1285 - Spec omission, fix docbook errors for spec.txt creation.

TL/06 Add Experimental DMARC support using libopendmarc libraries.

TL/07 Fix an out of order global option causing a segfault.  Reported to dev
      mailing list by by Dmitry Isaikin.

JH/01 Bugzilla 1201 & 304 - New cutthrough-delivery feature, with TLS support.

JH/02 Support "G" suffix to numbers in ${if comparisons.

PP/08 Handle smtp transport tls_sni option forced-fail for OpenSSL.

NM/01 Bugzilla 1197 - Spec typo
      Bugzilla 1196 - Spec examples corrections

JH/03 Add expansion operators ${listnamed:name} and ${listcount:string}

PP/09 Add gnutls_allow_auto_pkcs11 option (was originally called
      gnutls_enable_pkcs11, but renamed to more accurately indicate its
      function.

PP/10 Let Linux makefile inherit CFLAGS/CFLAGS_DYNAMIC.
      Pulled from Debian 30_dontoverridecflags.dpatch by Andreas Metzler.

JH/04 Add expansion item ${acl {name}{arg}...}, expansion condition
      "acl {{name}{arg}...}", and optional args on acl condition
      "acl = name arg..."

JH/05 Permit multiple router/transport headers_add/remove lines.

JH/06 Add dnsdb pseudo-lookup "a+" to do an "aaaa" + "a" combination.

JH/07 Avoid using a waiting database for a single-message-only transport.
      Performance patch from Paul Fisher.  Bugzilla 1262.

JH/08 Strip leading/trailing newlines from add_header ACL modifier data.
      Bugzilla 884.

JH/09 Add $headers_added variable, with content from use of ACL modifier
      add_header (but not yet added to the message).  Bugzilla 199.

JH/10 Add 8bitmime log_selector, for 8bitmime status on the received line.
      Pulled from Bugzilla 817 by Wolfgang Breyha.

PP/11 SECURITY: protect DKIM DNS decoding from remote exploit.
      CVE-2012-5671
      (nb: this is the same fix as in Exim 4.80.1)

JH/11 Add A= logging on delivery lines, and a client_set_id option on
      authenticators.

JH/12 Add optional authenticated_sender logging to A= and a log_selector
      for control.

PP/12 Unbreak server_set_id for NTLM/SPA auth, broken by 4.80 PP/29.

PP/13 Dovecot auth: log better reason to rejectlog if Dovecot did not
      advertise SMTP AUTH mechanism to us, instead of a generic
      protocol violation error.  Also, make Exim more robust to bad
      data from the Dovecot auth socket.

TF/01 Fix ultimate retry timeouts for intermittently deliverable recipients.

      When a queue runner is handling a message, Exim first routes the
      recipient addresses, during which it prunes them based on the retry
      hints database. After that it attempts to deliver the message to
      any remaining recipients. It then updates the hints database using
      the retry rules.

      So if a recipient address works intermittently, it can get repeatedly
      deferred at routing time. The retry hints record remains fresh so the
      address never reaches the final cutoff time.

      This is a fairly common occurrence when a user is bumping up against
      their storage quota. Exim had some logic in its local delivery code
      to deal with this. However it did not apply to per-recipient defers
      in remote deliveries, e.g. over LMTP to a separate IMAP message store.

      This change adds a proper retry rule check during routing so that the
      final cutoff time is checked against the message's age. We only do
      this check if there is an address retry record and there is not a
      domain retry record; this implies that previous attempts to handle
      the address had the retry_use_local_parts option turned on. We use
      this as an approximation for the destination being like a local
      delivery, as in LMTP.

      I suspect this new check makes the old local delivery cutoff check
      redundant, but I have not verified this so I left the code in place.

TF/02 Correct gecos expansion when From: is a prefix of the username.

      Test 0254 submits a message to Exim with the header

        Resent-From: f

      When I ran the test suite under the user fanf2, Exim expanded
      the header to contain my full name, whereas it should have added
      a Resent-Sender: header. It erroneously treats any prefix of the
      username as equal to the username.

      This change corrects that bug.

GF/01 DCC debug and logging tidyup
      Error conditions log to paniclog rather than rejectlog.
      Debug lines prefixed by "DCC: " to remove any ambiguity.

TF/03 Avoid unnecessary rebuilds of lookup-related code.

PP/14 Fix OCSP reinitialisation in SNI handling for Exim/TLS as server.
      Bug spotted by Jeremy Harris; was flawed since initial commit.
      Would have resulted in OCSP responses post-SNI triggering an Exim
      NULL dereference and crash.

JH/13 Add $router_name and $transport_name variables.  Bugzilla 308.

PP/15 Define SIOCGIFCONF_GIVES_ADDR for GNU Hurd.
      Bug detection, analysis and fix by Samuel Thibault.
      Bugzilla 1331, Debian bug #698092.

SC/01 Update eximstats to watch out for senders sending 'HELO [IpAddr]'

JH/14 SMTP PRDR (http://www.eric-a-hall.com/specs/draft-hall-prdr-00.txt).
      Server implementation by Todd Lyons, client by JH.
      Only enabled when compiled with EXPERIMENTAL_PRDR.  A new
      config variable "prdr_enable" controls whether the server
      advertises the facility.  If the client requests PRDR a new
      acl_data_smtp_prdr ACL is called once for each recipient, after
      the body content is received and before the acl_smtp_data ACL.
      The client is controlled by bolth of: a hosts_try_prdr option
      on the smtp transport, and the server advertisement.
      Default client logging of deliveries and rejections involving
      PRDR are flagged with the string "PRDR".

PP/16 Fix problems caused by timeouts during quit ACLs trying to double
      fclose().  Diagnosis by Todd Lyons.

PP/17 Update configure.default to handle IPv6 localhost better.
      Patch by Alain Williams (plus minor tweaks).
      Bugzilla 880.

PP/18 OpenSSL made graceful with empty tls_verify_certificates setting.
      This is now consistent with GnuTLS, and is now documented: the
      previous undocumented portable approach to treating the option as
      unset was to force an expansion failure.  That still works, and
      an empty string is now equivalent.

PP/19 Renamed DNSSEC-enabling option to "dns_dnssec_ok", to make it
      clearer that Exim is using the DO (DNSSEC OK) EDNS0 resolver flag,
      not performing validation itself.

PP/20 Added force_command boolean option to pipe transport.
      Patch from Nick Koston, of cPanel Inc.

JH/15 AUTH support on callouts (and hence cutthrough-deliveries).
      Bugzilla 321, 823.

TF/04 Added udpsend ACL modifer and hexquote expansion operator

PP/21 Fix eximon continuous updating with timestamped log-files.
      Broken in a format-string cleanup in 4.80, missed when I repaired the
      other false fix of the same issue.
      Report and fix from Heiko Schlichting.
      Bugzilla 1363.

PP/22 Guard LDAP TLS usage against Solaris LDAP variant.
      Report from Prashanth Katuri.

PP/23 Support safari_ecdhe_ecdsa_bug for openssl_options.
      It's SecureTransport, so affects any MacOS clients which use the
      system-integrated TLS libraries, including email clients.

PP/24 Fix segfault from trying to fprintf() to a NULL stdio FILE* if
      using a MIME ACL for non-SMTP local injection.
      Report and assistance in diagnosis by Warren Baker.

TL/08 Adjust exiqgrep to be case-insensitive for sender/receiver.

JH/16 Fix comparisons for 64b.  Bugzilla 1385.

TL/09 Add expansion variable $authenticated_fail_id to keep track of
      last id that failed so it may be referenced in subsequent ACL's.

TL/10 Bugzilla 1375 - Prevent TLS rebinding in ldap. Patch provided by
      Alexander Miroch.

TL/11 Bugzilla 1382 - Option ldap_require_cert overrides start_tls
      ldap library initialization, allowing self-signed CA's to be
      used. Also properly sets require_cert option later in code by
      using NULL (global ldap config) instead of ldap handle (per
      session). Bug diagnosis and testing by alxgomz.

TL/12 Enhanced documentation in the ratelimit.pl script provided in
      the src/util/ subdirectory.

TL/13 Bug 1031 - Imported transport SQL logging patch from Axel Rau
      renamed to Transport Post Delivery Action by Jeremy Harris, as
      EXPERIMENTAL_TPDA.

TL/14 Bugzilla 1217 - Redis lookup support has been added. It is only enabled
      when Exim is compiled with EXPERIMENTAL_REDIS. A new config variable
      redis_servers = needs to be configured which will be used by the redis
      lookup.  Patch from Warren Baker, of The Packet Hub.

TL/15 Fix exiqsumm summary for corner case. Patch provided by Richard Hall.

TL/16 Bugzilla 1289 - Clarify host/ip processing when have errors looking up a
      hostname or reverse DNS when processing a host list. Used suggestions
      from multiple comments on this bug.

TL/17 Bugzilla 1057 - Multiple clamd TCP targets patch from Mark Zealey.

TL/18 Had previously added a -CONTINUE option to runtest in the test suite.
      Missed a few lines, added it to make the runtest require no keyboard
      interaction.

TL/19 Bugzilla 1402 - Test 533 fails if any part of the path to the test suite
      contains upper case chars. Make router use caseful_local_part.

TL/20 Bugzilla 1400 - Add AVOID_GNUTLS_PKCS11 build option. Allows GnuTLS
      support when GnuTLS has been built with p11-kit.


Exim version 4.80.1
-------------------

PP/01 SECURITY: protect DKIM DNS decoding from remote exploit.
      CVE-2012-5671
      This, or similar/improved, will also be change PP/11 of 4.82.


Exim version 4.80
-----------------

PP/01 Handle short writes when writing local log-files.
      In practice, only affects FreeBSD (8 onwards).
      Bugzilla 1053, with thanks to Dmitry Isaikin.

NM/01 Bugzilla 949 - Documentation tweak

NM/02 Bugzilla 1093 - eximstats DATA reject detection regexps
      improved.

NM/03 Bugzilla 1169 - primary_hostname spelling was incorrect in docs.

PP/02 Implemented gsasl authenticator.

PP/03 Implemented heimdal_gssapi authenticator with "server_keytab" option.

PP/04 Local/Makefile support for (AUTH|LOOKUP)_*_PC=foo to use
      `pkg-config foo` for cflags/libs.

PP/05 Swapped $auth1/$auth2 for gsasl GSSAPI mechanism, to be more consistent
      with rest of GSASL and with heimdal_gssapi.

PP/06 Local/Makefile support for USE_(GNUTLS|OPENSSL)_PC=foo to use
      `pkg-config foo` for cflags/libs for the TLS implementation.

PP/07 New expansion variable $tls_bits; Cyrus SASL server connection
      properties get this fed in as external SSF.  A number of robustness
      and debugging improvements to the cyrus_sasl authenticator.

PP/08 cyrus_sasl server now expands the server_realm option.

PP/09 Bugzilla 1214 - Log authentication information in reject log.
      Patch by Jeremy Harris.

PP/10 Added dbmjz lookup type.

PP/11 Let heimdal_gssapi authenticator take a SASL message without an authzid.

PP/12 MAIL args handles TAB as well as SP, for better interop with
      non-compliant senders.
      Analysis and variant patch by Todd Lyons.

NM/04 Bugzilla 1237 - fix cases where printf format usage not indicated
      Bug report from Lars Müller <lars@samba.org> (via SUSE), 
      Patch from Dirk Mueller <dmueller@suse.com>

PP/13 tls_peerdn now print-escaped for spool files.
      Observed some $tls_peerdn in wild which contained \n, which resulted
      in spool file corruption.

PP/14 TLS fixes for OpenSSL: support TLS 1.1 & 1.2; new "openssl_options"
      values; set SSL_MODE_AUTO_RETRY so that OpenSSL will retry a read
      or write after TLS renegotiation, which otherwise led to messages
      "Got SSL error 2".

TK/01 Bugzilla 1239 - fix DKIM verification when signature was not inserted
      as a tracking header (ie: a signed header comes before the signature).
      Patch from Wolfgang Breyha.

JH/01 Bugzilla 660 - Multi-valued attributes from ldap now parseable as a
      comma-sep list; embedded commas doubled.

JH/02 Refactored ACL "verify =" logic to table-driven dispatch.

PP/15 LDAP: Check for errors of TLS initialisation, to give correct
      diagnostics.
      Report and patch from Dmitry Banschikov.

PP/16 Removed "dont_insert_empty_fragments" fron "openssl_options".
      Removed SSL_clear() after SSL_new() which led to protocol negotiation
      failures.  We appear to now support TLS1.1+ with Exim.

PP/17 OpenSSL: new expansion var $tls_sni, which if used in tls_certificate
      lets Exim select keys and certificates based upon TLS SNI from client.
      Also option tls_sni on SMTP Transports.  Also clear $tls_bits correctly
      before an outbound SMTP session.  New log_selector, +tls_sni.

PP/18 Bugzilla 1122 - check localhost_number expansion for failure, avoid
      NULL dereference.  Report and patch from Alun Jones.

PP/19 DNS resolver init changes for NetBSD compatibility.  (Risk of breakage
      on less well tested platforms).  Obviates NetBSD pkgsrc patch-ac.
      Not seeing resolver debug output on NetBSD, but suspect this is a
      resolver implementation change.

PP/20 Revert part of NM/04, it broke log_path containing %D expansions.
      Left warnings.  Added "eximon gdb" invocation mode.

PP/21 Defaulting "accept_8bitmime" to true, not false.

PP/22 Added -bw for inetd wait mode support.

PP/23 Added PCRE_CONFIG=yes support to Makefile for using pcre-config to
      locate the relevant includes and libraries.  Made this the default.

PP/24 Fixed headers_only on smtp transports (was not sending trailing dot).
      Bugzilla 1246, report and most of solution from Tomasz Kusy.

JH/03 ${eval } now uses 64-bit and supports a "g" suffix (like to "k" and "m").
      This may cause build issues on older platforms.

PP/25 Revamped GnuTLS support, passing tls_require_ciphers to
      gnutls_priority_init, ignoring Exim options gnutls_require_kx,
      gnutls_require_mac & gnutls_require_protocols (no longer supported).
      Added SNI support via GnuTLS too.
      Made ${randint:..} supplier available, if using not-too-old GnuTLS.

PP/26 Added EXPERIMENTAL_OCSP for OpenSSL.

PP/27 Applied dnsdb SPF support patch from Janne Snabb.
      Applied second patch from Janne, implementing suggestion to default
      multiple-strings-in-record handling to match SPF spec.

JH/04 Added expansion variable $tod_epoch_l for a higher-precision time.

PP/28 Fix DCC dcc_header content corruption (stack memory referenced,
      read-only, out of scope).
      Patch from Wolfgang Breyha, report from Stuart Northfield.

PP/29 Fix three issues highlighted by clang analyser static analysis.
      Only crash-plausible issue would require the Cambridge-specific
      iplookup router and a misconfiguration.
      Report from Marcin Mirosław.

PP/30 Another attempt to deal with PCRE_PRERELEASE, this one less buggy.

PP/31 %D in printf continues to cause issues (-Wformat=security), so for
      now guard some of the printf checks behind WANT_DEEPER_PRINTF_CHECKS.
      As part of this, removing so much warning spew let me fix some minor
      real issues in debug logging.

PP/32 GnuTLS was always using default tls_require_ciphers, due to a missing
      assignment on my part.  Fixed.

PP/33 Added tls_dh_max_bits option, defaulting to current hard-coded limit
      of NSS, for GnuTLS/NSS interop.  Problem root cause diagnosis by
      Janne Snabb (who went above and beyond: thank you).

PP/34 Validate tls_require_ciphers on startup, since debugging an invalid
      string otherwise requires a connection and a bunch more work and it's
      relatively easy to get wrong.  Should also expose TLS library linkage
      problems.

PP/35 Pull in <features.h> on Linux, for some portability edge-cases of
      64-bit ${eval} (JH/03).

PP/36 Define _GNU_SOURCE in exim.h; it's needed for some releases of
      GNU libc to support some of the 64-bit stuff, should not lead to
      conflicts.  Defined before os.h is pulled in, so if a given platform
      needs to override this, it can.

PP/37 Unbreak Cyrus SASL auth: SSF retrieval was incorrect, Exim thought
      protection layer was required, which is not implemented.
      Bugzilla 1254, patch from Wolfgang Breyha.

PP/38 Overhaul DH prime handling, supply RFC-specified DH primes as built
      into Exim, default to IKE id 23 from RFC 5114 (2048 bit).  Make
      tls_dhparam take prime identifiers.  Also unbreak combination of
      OpenSSL+DH_params+TLSSNI.

PP/39 Disable SSLv2 by default in OpenSSL support.


Exim version 4.77
-----------------

PP/01 Solaris build fix for Oracle's LDAP libraries.
      Bugzilla 1109, patch from Stephen Usher.

TF/01 HP/UX build fix: avoid arithmetic on a void pointer.

TK/01 DKIM Verification: Fix relaxed canon for empty headers w/o
      whitespace trailer

TF/02 Fix a couple more cases where we did not log the error message
      when unlink() failed. See also change 4.74-TF/03.

TF/03 Make the exiwhat support code safe for signals. Previously Exim might
      lock up or crash if it happened to be inside a call to libc when it
      got a SIGUSR1 from exiwhat.

      The SIGUSR1 handler appends the current process status to the process
      log which is later printed by exiwhat. It used to use the general
      purpose logging code to do this, but several functions it calls are
      not safe for signals.

      The new output code in the SIGUSR1 handler is specific to the process
      log, and simple enough that it's easy to inspect for signal safety.
      Removing some special cases also simplifies the general logging code.
      Removing the spurious timestamps from the process log simplifies
      exiwhat.

TF/04 Improved ratelimit ACL condition.

      The /noupdate option has been deprecated in favour of /readonly which
      has clearer semantics. The /leaky, /strict, and /readonly update modes
      are mutually exclusive. The update mode is no longer included in the
      database key; it just determines when the database is updated. (This
      means that when you upgrde Exim will forget old rate measurements.)

      Exim now checks that the per_* options are used with an update mode that
      makes sense for the current ACL. For example, when Exim is processing a
      message (e.g. acl_smtp_rcpt or acl_smtp_data, etc.) you can specify
      per_mail/leaky or per_mail/strict; otherwise (e.g. in acl_smtp_helo) you
      must specify per_mail/readonly. If you omit the update mode it defaults to
      /leaky where that makes sense (as before) or /readonly where required.

      The /noupdate option is now undocumented but still supported for
      backwards compatibility. It is equivalent to /readonly except that in
      ACLs where /readonly is required you may specify /leaky/noupdate or
      /strict/noupdate which are treated the same as /readonly.

      A useful new feature is the /count= option. This is a generalization
      of the per_byte option, so that you can measure the throughput of other
      aggregate values. For example, the per_byte option is now equivalent
      to per_mail/count=${if >{0}{$message_size} {0} {$message_size} }.

      The per_rcpt option has been generalized using the /count= mechanism
      (though it's more complicated than the per_byte equivalence). When it is
      used in acl_smtp_rcpt, the per_rcpt option adds recipients to the
      measured rate one at a time; if it is used later (e.g. in acl_smtp_data)
      or in a non-SMTP ACL it adds all the recipients in one go. (The latter
      /count=$recipients_count behaviour used to work only in non-SMTP ACLs.)
      Note that using per_rcpt with a non-readonly update mode in more than
      one ACL will cause the recipients to be double-counted. (The per_mail
      and per_byte options don't have this problem.)

      The handling of very low rates has changed slightly. If the computed rate
      is less than the event's count (usually one) then this event is the first
      after a long gap. In this case the rate is set to the same as this event's
      count, so that the first message of a spam run is counted properly.

      The major new feature is a mechanism for counting the rate of unique
      events. The new per_addr option counts the number of different
      recipients that someone has sent messages to in the last time period. It
      behaves like per_rcpt if all the recipient addresses are different, but
      duplicate recipient addresses do not increase the measured rate. Like
      the /count= option this is a general mechanism, so the per_addr option
      is equivalent to per_rcpt/unique=$local_part@$domain. You can, for
      example, measure the rate that a client uses different sender addresses
      with the options per_mail/unique=$sender_address. There are further
      details in the main documentation.

TF/05 Removed obsolete $Cambridge$ CVS revision strings.

TF/06 Removed a few PCRE remnants.

TF/07 Automatically extract Exim's version number from tags in the git
      repository when doing development or release builds.

PP/02 Raise smtp_cmd_buffer_size to 16kB.
      Bugzilla 879.  Patch from Paul Fisher.

PP/03 Implement SSL-on-connect outbound with protocol=smtps on smtp transport.
      Heavily based on revision 40f9a89a from Simon Arlott's tree.
      Bugzilla 97.

PP/04 Use .dylib instead of .so for dynamic library loading on MacOS.

PP/05 Variable $av_failed, true if the AV scanner deferred.
      Bugzilla 1078.  Patch from John Horne.

PP/06 Stop make process more reliably on build failure.
      Bugzilla 1087.  Patch from Heiko Schlittermann.

PP/07 Make maildir_use_size_file an _expandable_ boolean.
      Bugzilla 1089.  Patch from Heiko Schlittermann.

PP/08 Handle ${run} returning more data than OS pipe buffer size.
      Bugzilla 1131.  Patch from Holger Weiß.

PP/09 Handle IPv6 addresses with SPF.
      Bugzilla 860.  Patch from Wolfgang Breyha.

PP/10 GnuTLS: support TLS 1.2 & 1.1.
      Bugzilla 1156.
      Use gnutls_certificate_verify_peers2() [patch from Andreas Metzler].
      Bugzilla 1095.

PP/11 match_* no longer expand right-hand-side by default.
      New compile-time build option, EXPAND_LISTMATCH_RHS.
      New expansion conditions, "inlist", "inlisti".

PP/12 fix uninitialised greeting string from PP/03 (smtps client support).

PP/13 shell and compiler warnings fixes for RC1-RC4 changes.

PP/14 fix log_write() format string regression from TF/03.
      Bugzilla 1152.  Patch from Dmitry Isaikin.


Exim version 4.76
-----------------

PP/01 The new ldap_require_cert option would segfault if used.  Fixed.

PP/02 Harmonised TLS library version reporting; only show if debugging.
      Layout now matches that introduced for other libraries in 4.74 PP/03.

PP/03 New openssl_options items: no_sslv2 no_sslv3 no_ticket no_tlsv1

PP/04 New "dns_use_edns0" global option.

PP/05 Don't segfault on misconfiguration of ref:name exim-user as uid.
      Bugzilla 1098.

PP/06 Extra paranoia around buffer usage at the STARTTLS transition.
      nb: Exim is not vulnerable to http://www.kb.cert.org/vuls/id/555316

TK/01 Updated PolarSSL code to 0.14.2.
      Bugzilla 1097. Patch from Andreas Metzler.

PP/07 Catch divide-by-zero in ${eval:...}.
      Fixes bugzilla 1102.

PP/08 Condition negation of bool{}/bool_lax{} did not negate.  Fixed.
      Bugzilla 1104.

TK/02 Bugzilla 1106: CVE-2011-1764 - DKIM log line was subject to a
      format-string attack -- SECURITY: remote arbitrary code execution.

TK/03 SECURITY - DKIM signature header parsing was double-expanded, second
      time unintentionally subject to list matching rules, letting the header
      cause arbitrary Exim lookups (of items which can occur in lists, *not*
      arbitrary string expansion). This allowed for information disclosure.

PP/09 Fix another SIGFPE (x86) in ${eval:...} expansion, this time related to
      INT_MIN/-1 -- value coerced to INT_MAX.


Exim version 4.75
-----------------

NM/01 Workround for PCRE version dependency in version reporting
      Bugzilla 1073

TF/01 Update valgrind.h and memcheck.h to copies from valgrind-3.6.0.
      This fixes portability to compilers other than gcc, notably
      Solaris CC and HP-UX CC. Fixes Bugzilla 1050.

TF/02 Bugzilla 139: Avoid using the += operator in the modular lookup
      makefiles for portability to HP-UX and POSIX correctness.

PP/01 Permit LOOKUP_foo enabling on the make command-line.
      Also via indented variable definition in the Makefile.
      (Debugging by Oliver Heesakkers).

PP/02 Restore caching of spamd results with expanded spamd_address.
      Patch from author of expandable spamd_address patch, Wolfgang Breyha.

PP/03 Build issue: lookups-Makefile now exports LC_ALL=C
      Improves build reliability.  Fix from: Frank Elsner

NM/02 Fix wide character breakage in the rfc2047 coding
      Fixes bug 1064. Patch from Andrey N. Oktyabrski

NM/03 Allow underscore in dnslist lookups
      Fixes bug 1026. Patch from Graeme Fowler

PP/04 Bugzilla 230: Support TLS-enabled LDAP (in addition to ldaps).
      Code patches from Adam Ciarcinski of NetBSD.

NM/04 Fixed exiqgrep to cope with mailq missing size issue
      Fixes bug 943.

PP/05 Bugzilla 1083: when lookup expansion defers, escape the output which
      is logged, to avoid truncation. Patch from John Horne.

PP/06 Bugzilla 1042: implement freeze_signal on pipe transports.
      Patch from Jakob Hirsch.

PP/07 Bugzilla 1061: restrict error messages sent over SMTP to not reveal
      SQL string expansion failure details.
      Patch from Andrey Oktyabrski.

PP/08 Bugzilla 486: implement %M datestamping in log filenames.
      Patch from Simon Arlott.

PP/09 New lookups functionality failed to compile on old gcc which rejects
      extern declarations in function scope.
      Patch from Oliver Fleischmann

PP/10 Use sig_atomic_t for flags set from signal handlers.
      Check getgroups() return and improve debugging.
      Fixed developed for diagnosis in bug 927 (which turned out to be
      a kernel bug).

PP/11 Bugzilla 1055: Update $message_linecount for maildir_tag.
      Patch from Mark Zealey.

PP/12 Bugzilla 1056: Improved spamd server selection.
      Patch from Mark Zealey.

PP/13 Bugzilla 1086: Deal with maildir quota file races.
      Based on patch from Heiko Schlittermann.

PP/14 Bugzilla 1019: DKIM multiple signature generation fix.
      Patch from Uwe Doering, sign-off by Michael Haardt.

NM/05 Fix to spam.c to accommodate older gcc versions which dislike
      variable declaration deep within a block.  Bug and patch from
      Dennis Davis.

PP/15 lookups-Makefile IRIX compatibilty coercion.

PP/16 Make DISABLE_DKIM build knob functional.

NM/06 Bugzilla 968: child_open_uid: restore default SIGPIPE handler
      Patch by Simon Arlott

TF/03 Fix valgrind.h portability to C89 compilers that do not support
      variable argument macros. Our copy now differs from upstream.


Exim version 4.74
-----------------

TF/01 Failure to get a lock on a hints database can have serious
      consequences so log it to the panic log.

TF/02 Log LMTP confirmation messages in the same way as SMTP,
      controlled using the smtp_confirmation log selector.

TF/03 Include the error message when we fail to unlink a spool file.

DW/01 Bugzilla 139: Support dynamically loaded lookups as modules.
      With thanks to Steve Haslam, Johannes Berg & Serge Demonchaux
      for maintaining out-of-tree patches for some time.

PP/01 Bugzilla 139: Documentation and portability issues.
      Avoid GNU Makefile-isms, let Exim continue to build on BSD.
      Handle per-OS dynamic-module compilation flags.

PP/02 Let /dev/null have normal permissions.
      The 4.73 fixes were a little too stringent and complained about the
      permissions on /dev/null.  Exempt it from some checks.
      Reported by Andreas M. Kirchwitz.

PP/03 Report version information for many libraries, including
      Exim version information for dynamically loaded libraries.  Created
      version.h, now support a version extension string for distributors
      who patch heavily. Dynamic module ABI change.

PP/04 CVE-2011-0017 - check return value of setuid/setgid. This is a
      privilege escalation vulnerability whereby the Exim run-time user
      can cause root to append content of the attacker's choosing to
      arbitrary files.

PP/05 Bugzilla 1041: merged DCC maintainer's fixes for return code.
      (Wolfgang Breyha)

PP/06 Bugzilla 1071: fix delivery logging with untrusted macros.
      If dropping privileges for untrusted macros, we disabled normal logging
      on the basis that it would fail; for the Exim run-time user, this is not
      the case, and it resulted in successful deliveries going unlogged.
      Fixed.  Reported by Andreas Metzler.


Exim version 4.73
-----------------

PP/01 Date: & Message-Id: revert to normally being appended to a message,
      only prepend for the Resent-* case.  Fixes regression introduced in
      Exim 4.70 by NM/22 for Bugzilla 607.

PP/02 Include check_rfc2047_length in configure.default because we're seeing
      increasing numbers of administrators be bitten by this.

JJ/01 Added DISABLE_DKIM and comment to src/EDITME

PP/03 Bugzilla 994: added openssl_options main configuration option.

PP/04 Bugzilla 995: provide better SSL diagnostics on failed reads.

PP/05 Bugzilla 834: provide a permit_coredump option for pipe transports.

PP/06 Adjust NTLM authentication to handle SASL Initial Response.

PP/07 If TLS negotiated an anonymous cipher, we could end up with SSL but
      without a peer certificate, leading to a segfault because of an
      assumption that peers always have certificates.  Be a little more
      paranoid.  Problem reported by Martin Tscholak.

PP/08 Bugzilla 926: switch ClamAV to use the new zINSTREAM API for content
      filtering; old API available if built with WITH_OLD_CLAMAV_STREAM=yes
      NB: ClamAV planning to remove STREAM in "middle of 2010".
      CL also introduces -bmalware, various -d+acl logging additions and
      more caution in buffer sizes.

PP/09 Implemented reverse_ip expansion operator.

PP/10 Bugzilla 937: provide a "debug" ACL control.

PP/11 Bugzilla 922: Documentation dusting, patch provided by John Horne.

PP/12 Bugzilla 973: Implement --version.

PP/13 Bugzilla 752: Refuse to build/run if Exim user is root/0.

PP/14 Build without WITH_CONTENT_SCAN. Path from Andreas Metzler.

PP/15 Bugzilla 816: support multiple condition rules on Routers.

PP/16 Add bool_lax{} expansion operator and use that for combining multiple
      condition rules, instead of bool{}.  Make both bool{} and bool_lax{}
      ignore trailing whitespace.

JJ/02 prevent non-panic DKIM error from being sent to paniclog

JJ/03 added tcp_wrappers_daemon_name to allow host entries other than
      "exim" to be used

PP/17 Fix malware regression for cmdline scanner introduced in PP/08.
      Notification from Dr Andrew Aitchison.

PP/18 Change ClamAV response parsing to be more robust and to handle ClamAV's
      ExtendedDetectionInfo response format.
      Notification from John Horne.

PP/19 OpenSSL 1.0.0a compatibility const-ness change, should be backwards
      compatible.

PP/20 Added a CONTRIBUTING file.  Fixed the documentation build to use http:
      XSL and documented dependency on system catalogs, with examples of how
      it normally works.

DW/21 Added Valgrind hooks in store.c to help it capture out-of-bounds store
      access.

DW/22 Bugzilla 1044: CVE-2010-4345 - partial fix: restrict default behaviour
      of CONFIGURE_OWNER and CONFIGURE_GROUP options to no longer allow a
      configuration file which is writeable by the Exim user or group.

DW/23 Bugzilla 1044: CVE-2010-4345 - part two: extend checks for writeability
      of configuration files to cover files specified with the -C option if
      they are going to be used with root privileges, not just the default
      configuration file.

DW/24 Bugzilla 1044: CVE-2010-4345 - part three: remove ALT_CONFIG_ROOT_ONLY
      option (effectively making it always true).

DW/25 Add TRUSTED_CONFIG_PREFIX_FILE option to allow alternative configuration
      files to be used while preserving root privileges.

DW/26 Set FD_CLOEXEC on SMTP sockets after forking in the daemon, to ensure
      that rogue child processes cannot use them.

PP/27 Bugzilla 1047: change the default for system_filter_user to be the Exim
      run-time user, instead of root.

PP/28 Add WHITELIST_D_MACROS option to let some macros be overridden by the
      Exim run-time user without dropping privileges.

DW/29 Remove use of va_copy() which breaks pre-C99 systems. Duplicate the
      result string, instead of calling string_vformat() twice with the same
      arguments.

DW/30 Allow TRUSTED_CONFIG_PREFIX_FILE only for Exim or CONFIGURE_OWNER, not
      for other users. Others should always drop root privileges if they use
      -C on the command line, even for a whitelisted configure file.

DW/31 Turn TRUSTED_CONFIG_PREFIX_FILE into TRUSTED_CONFIG_FILE. No prefixes.

NM/01 Fixed bug #1002 - Message loss when using multiple deliveries


Exim version 4.72
-----------------

JJ/01 installed exipick 20100104.1, adding $max_received_linelength,
      $data_path, and $header_path variables; fixed documentation bugs and
      typos

JJ/02 installed exipick 20100222.0, added --input-dir and --finput to allow
      exipick to access non-standard spools, including the "frozen" queue
      (Finput)

NM/01 Bugzilla 965: Support mysql stored procedures.
      Patch from Alain Williams

NM/02 Bugzilla 961: Spacing fix (syntax error) on Makefile directives for NetBSD

NM/03 Bugzilla 955: Documentation fix for max_rcpts.
      Patch from Andreas Metzler

NM/04 Bugzilla 954: Fix for unknown responses from Dovecot authenticator.
      Patch from Kirill Miazine

NM/05 Bugzilla 671: Added umask to procmail example.

JJ/03 installed exipick 20100323.0, fixing doc bug

NM/06 Bugzilla 988: CVE-2010-2023 - prevent hardlink attack on sticky mail
      directory.  Notification and patch from Dan Rosenberg.

TK/01 PDKIM: Upgrade PolarSSL files to upstream version 0.12.1.

TK/02 Improve log output when DKIM signing operation fails.

MH/01 Treat the transport option dkim_domain as a colon separated
      list, not as a single string, and sign the message with each element,
      omitting multiple occurences of the same signer.

NM/07 Null terminate DKIM strings, Null initialise DKIM variable
      Bugzilla 985, 986.  Patch by Simon Arlott

NM/08 Bugzilla 967. dnsdb DNS TXT record bug fix (DKIM-related)
      Patch by Simon Arlott

PP/01 Bugzilla 989: CVE-2010-2024 - work round race condition on
      MBX locking.  Notification from Dan Rosenberg.


Exim version 4.71
-----------------

TK/01 Bugzilla 912: Fix DKIM segfault on empty headers/body.

NM/01 Bugzilla 913: Documentation fix for gnutls_* options.

NM/02 Bugzilla 722: Documentation for randint.  Better randomness defaults.

NM/03 Bugzilla 847: Enable DNSDB lookup by default.

NM/04 Bugzilla 915: Flag broken perl installation during build.


Exim version 4.70
-----------------

TK/01 Added patch by Johannes Berg that expands the main option
      "spamd_address" if it starts with a dollar sign.

TK/02 Write list of recipients to X-Envelope-Sender header when building
      the mbox-format spool file for content scanning (suggested by Jakob
      Hirsch).

TK/03 Added patch by Wolfgang Breyha that adds experimental DCC
      (http://www.dcc-servers.net/) support via dccifd. Activated by
      setting EXPERIMENTAL_DCC=yes in Local/Makefile.

TK/04 Bugzilla 673: Add f-protd malware scanner support. Patch submitted
      by Mark Daniel Reidel <mr@df.eu>.

NM/01 Bugzilla 657: Embedded PCRE removed from the exim source tree.
      When building exim an external PCRE library is now needed -
      PCRE is a system library on the majority of modern systems.
      See entry on PCRE_LIBS in EDITME file.

NM/02 Bugzilla 646: Removed unwanted C/R in Dovecot authenticator
      conversation.  Added nologin parameter to request.
      Patch contributed by Kirill Miazine.

TF/01 Do not log submission mode rewrites if they do not change the address.

TF/02 Bugzilla 662: Fix stack corruption before exec() in daemon.c.

NM/03 Bugzilla 602: exicyclog now handles panic log, and creates empty
      log files in place.  Contributed by Roberto Lima.

NM/04 Bugzilla 667: Close socket used by dovecot authenticator.

TF/03 Bugzilla 615: When checking the local_parts router precondition
      after a local_part_suffix or local_part_prefix option, Exim now
      does not use the address's named list lookup cache, since this
      contains cached lookups for the whole local part.

NM/05 Bugzilla 521: Integrated SPF Best Guess support contributed by
      Robert Millan.  Documentation is in experimental-spec.txt.

TF/04 Bugzilla 668: Fix parallel build (make -j).

NM/05.2 Bugzilla 437: Prevent Maildir aux files being created with mode 000.

NM/05.3 Bugzilla 598: Improvement to Dovecot authenticator handling.
      Patch provided by Jan Srzednicki.

TF/05 Leading white space used to be stripped from $spam_report which
      wrecked the formatting. Now it is preserved.

TF/06 Save $spam_score, $spam_bar, and $spam_report in spool files, so
      that they are available at delivery time.

TF/07 Fix the way ${extract is skipped in the untaken branch of a conditional.

TF/08 TLS error reporting now respects the incoming_interface and
      incoming_port log selectors.

TF/09 Produce a more useful error message if an SMTP transport's hosts
      setting expands to an empty string.

NM/06 Bugzilla 744: EXPN did not work under TLS.
      Patch provided by Phil Pennock.

NM/07 Bugzilla 769: Extraneous comma in usage fprintf
      Patch provided by Richard Godbee.

NM/08 Fixed erroneous documentation references to smtp_notquit_acl to be
      acl_smtp_notquit, added index entry.

NM/09 Bugzilla 787: Potential buffer overflow in string_format.
      Patch provided by Eugene Bujak.

NM/10 Bugzilla 770: Problem on some platforms modifying the len parameter to
      accept(). Patch provided by Maxim Dounin.

NM/11 Bugzilla 749: Preserve old behaviour of blanks comparing equal to zero.
      Patch provided by Phil Pennock.

NM/12 Bugzilla 497: Correct behaviour of exiwhat when no config exists.

NM/13 Bugzilla 590: Correct handling of Resent-Date headers.
      Patch provided by Brad "anomie" Jorsch.

NM/14 Bugzilla 622: Added timeout setting to transport filter.
      Patch provided by Dean Brooks.

TK/05 Add native DKIM support (does not depend on external libraries).

NM/15 Bugzilla 854: Removed code that symlinks to pcre as its no longer useful.
      Patch provided by Graeme Fowler.

NM/16 Bugzilla 851: Documentation example syntax fix.

NM/17 Changed NOTICE file to remove references to embedded PCRE.

NM/18 Bugzilla 894: Fix issue with very long lines including comments in
      lsearch.

NM/19 Bugzilla 745: TLS version reporting.
      Patch provided by Phil Pennock.

NM/20 Bugzilla 167: bool: condition support.
      Patch provided by Phil Pennock.

NM/21 Bugzilla 665: gnutls_compat_mode to allow compatibility with broken
      clients. Patch provided by Phil Pennock.

NM/22 Bugzilla 607: prepend (not append) Resent-Message-ID and Resent-Date.
      Patch provided by Brad "anomie" Jorsch.

NM/23 Bugzilla 687: Fix misparses in eximstats.
      Patch provided by Heiko Schlittermann.

NM/24 Bugzilla 688: Fix exiwhat to handle log_selector = +pid.
      Patch provided by Heiko Schlittermann.

NM/25 Bugzilla 727: Use transport mode as default mode for maildirsize file.
      plus update to original patch.

NM/26 Bugzilla 799: Documentation correction for ratelimit.

NM/27 Bugzilla 802: Improvements to local interface IP addr detection.
      Patch provided by David Brownlee.

NM/28 Bugzilla 807: Improvements to LMTP delivery logging.

NM/29 Bugzilla 862, 866, 875: Documentation bugfixes.

NM/30 Bugzilla 888: TLS documentation bugfixes.

NM/31 Bugzilla 896: Dovecot buffer overrun fix.

NM/32 Bugzilla 889: Change all instances of "expr" in shell scripts to "expr --"
      Unlike the original bugzilla I have changed all shell scripts in src tree.

NM/33 Bugzilla 898: Transport filter timeout fix.
      Patch by Todd Rinaldo.

NM/34 Bugzilla 901: Fix sign/unsigned and UTF mismatches.
      Patch by Serge Demonchaux.

NM/35 Bugzilla 39: Base64 decode bug fixes.
      Patch by Jakob Hirsch.

NM/36 Bugzilla 909: Correct connect() call in dcc code.

NM/37 Bugzilla 910: Correct issue with relaxed/simple handling.

NM/38 Bugzilla 908: Removed NetBSD3 support as no longer needed.

NM/39 Bugzilla 911: Fixed MakeLinks build script.


Exim version 4.69
-----------------

TK/01 Add preliminary DKIM support. Currently requires a forked version of
      ALT-N's libdkim that I have put here:
      http://duncanthrax.net/exim-experimental/

      Note to Michael Haardt: I had to rename some vars in sieve.c. They
      were called 'true' and it seems that C99 defines that as a reserved
      keyword to be used with 'bool' variable types. That means you could
      not include C99-style headers which use bools without triggering
      build errors in sieve.c.

NM/01 Bugzilla 592: --help option is handled incorrectly if exim is invoked
      as mailq or other aliases.  Changed the --help handling significantly
      to do whats expected.  exim_usage() emits usage/help information.

SC/01 Added the -bylocaldomain option to eximstats.

NM/02 Bugzilla 619: Defended against bad data coming back from gethostbyaddr.

NM/03 Bugzilla 613: Documentation fix for acl_not_smtp.

NM/04 Bugzilla 628: PCRE update to 7.4 (work done by John Hall).


Exim version 4.68
-----------------

PH/01 Another patch from the Sieve maintainer.

PH/02 When an IPv6 address is converted to a string for single-key lookup
      in an address list (e.g. for an item such as "net24-dbm;/net/works"),
      dots are used instead of colons so that keys in lsearch files need not
      contain colons. This was done some time before quoting was made available
      in lsearch files. However, iplsearch files do require colons in IPv6 keys
      (notated using the quote facility) so as to distinguish them from IPv4
      keys. This meant that lookups for IP addresses in host lists did not work
      for iplsearch lookups.

      This has been fixed by arranging for IPv6 addresses to be expressed with
      colons if the lookup type is iplsearch. This is not incompatible, because
      previously such lookups could never work.

      The situation is now rather anomolous, since one *can* have colons in
      ordinary lsearch keys. However, making the change in all cases is
      incompatible and would probably break a number of configurations.

TK/01 Change PRVS address formatting scheme to reflect latests BATV draft
      version.

MH/01 The "spam" ACL condition code contained a sscanf() call with a %s
      conversion specification without a maximum field width, thereby enabling
      a rogue spamd server to cause a buffer overflow. While nobody in their
      right mind would setup Exim to query an untrusted spamd server, an
      attacker that gains access to a server running spamd could potentially
      exploit this vulnerability to run arbitrary code as the Exim user.

TK/02 Bugzilla 502: Apply patch to make the SPF-Received: header use
      $primary_hostname instead of what libspf2 thinks the hosts name is.

MH/02 The dsearch lookup now uses lstat(2) instead of stat(2) to look for
      a directory entry by the name of the lookup key. Previously, if a
      symlink pointed to a non-existing file or a file in a directory that
      Exim lacked permissions to read, a lookup for a key matching that
      symlink would fail. Now it is enough that a matching directory entry
      exists, symlink or not. (Bugzilla 503.)

PH/03 The body_linecount and body_zerocount variables are now exported in the
      local_scan API.

PH/04 Added the $dnslist_matched variable.

PH/05 Unset $tls_cipher and $tls_peerdn before making a connection as a client.
      This means they are set thereafter only if the connection becomes
      encrypted.

PH/06 Added the client_condition to authenticators so that some can be skipped
      by clients under certain conditions.

PH/07 The error message for a badly-placed control=no_multiline_responses left
      "_responses" off the end of the name.

PH/08 Added -Mvc to output a copy of a message in RFC 2822 format.

PH/09 Tidied the code for creating ratelimiting keys, creating them explicitly
      (without spaces) instead of just copying the configuration text.

PH/10 Added the /noupdate option to the ratelimit ACL condition.

PH/11 Added $max_received_linelength.

PH/12 Added +ignore_defer and +include_defer to host lists.

PH/13 Installed PCRE version 7.2. This needed some changes because of the new
      way in which PCRE > 7.0 is built.

PH/14 Implemented queue_only_load_latch.

PH/15 Removed an incorrect (int) cast when reading the value of SIZE in a
      MAIL command. The effect was to mangle the value on 64-bit systems.

PH/16 Another patch from the Sieve maintainer.

PH/17 Added the NOTQUIT ACL, based on a patch from Ted Cooper.

PH/18 If a system quota error occurred while trying to create the file for
      a maildir delivery, the message "Mailbox is full" was not appended to the
      bounce if the delivery eventually timed out. Change 4.67/27 below applied
      only to a quota excession during the actual writing of the file.

PH/19 It seems that peer DN values may contain newlines (and other non-printing
      characters?) which causes problems in log lines. The DN values are now
      passed through string_printing() before being added to log lines.

PH/20 Added the "servers=" facility to MySQL and PostgreSQL lookups. (Oracle
      and InterBase are left for another time.)

PH/21 Added message_body_newlines option.

PH/22 Guard against possible overflow in moan_check_errorcopy().

PH/23 POSIX allows open() to be a macro; guard against that.

PH/24 If the recipient of an error message contained an @ in the local part
      (suitably quoted, of course), incorrect values were put in $domain and
      $local_part during the evaluation of errors_copy.


Exim version 4.67
-----------------

MH/01 Fix for bug #448, segfault in Dovecot authenticator when interface_address
      is unset (happens when testing with -bh and -oMi isn't used). Thanks to
      Jan Srzednicki.

PH/01 Added a new log selector smtp_no_mail, to log SMTP sessions that do not
      issue a MAIL command.

PH/02 In an ACL statement such as

        deny dnslists = X!=127.0.0.2 : X=127.0.0.2

      if a client was not listed at all, or was listed with a value other than
      127.0.0.2, in the X list, but was listed with 127.0.0.2 in the Y list,
      the condition was not true (as it should be), so access was not denied.
      The bug was that the ! inversion was incorrectly passed on to the second
      item. This has been fixed.

PH/03 Added additional dnslists conditions == and =& which are different from
      = and & when the dns lookup returns more than one IP address.

PH/04 Added gnutls_require_{kx,mac,protocols} to give more control over the
      cipher suites used by GnuTLS. These options are ignored by OpenSSL.

PH/05 After discussion on the list, added a compile time option ENABLE_DISABLE_
      FSYNC, which compiles an option called disable_fsync that allows for
      bypassing fsync(). The documentation is heavily laced with warnings.

SC/01 Updated eximstats to collate all SpamAssassin rejects into one bucket.

PH/06 Some tidies to the infrastructure of the Test Suite that is concerned
      with the auxiliary C programs that it uses: (1) Arrange for BIND_8_COMPAT
      to be defined when compiling on OSX (Darwin); (2) Tidies to the Makefile,
      including adding "make clean"; (3) Added -fPIC when compiling the test
      dynamically loaded module, to get rid of a warning.

MH/02 Fix for bug #451, causing paniclog entries to be written if a bounce
      message fails, move_frozen_messages = true and ignore_bounce_errors_after
      = 0s. The bug is otherwise harmless.

PH/07 There was a bug in the dovecot authenticator such that the value of
      $auth1 could be overwritten, and so not correctly preserved, after a
      successful authentication. This usually meant that the value preserved by
      the server_setid option was incorrect.

PH/08 Added $smtp_count_at_connection_start, deliberately with a long name.

PH/09 Installed PCRE release 7.0.

PH/10 The acl_not_smtp_start ACL was, contrary to the documentation, not being
      run for batched SMTP input. It is now run at the start of every message
      in the batch. While fixing this I discovered that the process information
      (output by running exiwhat) was not always getting set for -bs and -bS
      input. This is fixed, and it now also says "batched" for BSMTP.

PH/11 Added control=no_pipelining.

PH/12 Added $sending_ip_address and $sending_port (mostly Magnus Holmgren's
      patch, slightly modified), and move the expansion of helo_data till after
      the connection is made in the smtp transport (so it can use these
      values).

PH/13 Added ${rfc2047d: to decoded RFC 2047 strings.

PH/14 Added log_selector = +pid.

PH/15 Flush SMTP output before delaying, unless control=no_delay_flush is set.

PH/16 Add ${if forany and ${if forall.

PH/17 Added dsn_from option to vary the From: line in DSNs.

PH/18 Flush SMTP output before performing a callout, unless control =
      no_callout_flush is set.

PH/19 Change 4.64/PH/36 introduced a bug: when address_retry_include_sender
      was true (the default) a successful delivery failed to delete the retry
      item, thus causing premature timeout of the address. The bug is now
      fixed.

PH/20 Added hosts_avoid_pipelining to the smtp transport.

PH/21 Long custom messages for fakedefer and fakereject are now split up
      into multiline reponses in the same way that messages for "deny" and
      other ACL rejections are.

PH/22 Applied Jori Hamalainen's speed-up changes and typo fixes to exigrep,
      with slight modification.

PH/23 Applied sieve patches from the maintainer "tracking the latest notify
      draft, changing the syntax and factoring some duplicate code".

PH/24 When the log selector "outgoing_port" was set, the port was shown as -1
      for deliveries of the second and subsequent messages over the same SMTP
      connection.

PH/25 Applied Magnus Holmgren's patch for ${addresses, ${map, ${filter, and
      ${reduce, with only minor "tidies".

SC/02 Applied Daniel Tiefnig's patch to improve the '($parent) =' pattern match.

PH/26 Added a "continue" ACL modifier that does nothing, for the benefit of its
      expansion side effects.

PH/27 When a message times out after an over-quota error from an Exim-imposed
      quota, the bounce message says "mailbox is full". This message was not
      being given when it was a system quota that was exceeded. It now should
      be the same.

MH/03 Made $recipients available in local_scan(). local_scan() already has
      better access to the recipient list through recipients_list[], but
      $recipients can be useful in postmaster-provided expansion strings.

PH/28 The $smtp_command and $smtp_command_argument variables were not correct
      in the case of a MAIL command with additional options following the
      address, for example: MAIL FROM:<foo@bar> SIZE=1234. The option settings
      were accidentally chopped off.

PH/29 SMTP synchronization checks are implemented when a command is read -
      there is a check that no more input is waiting when there shouldn't be
      any. However, for some commands, a delay in an ACL can mean that it is
      some time before the response is written. In this time, more input might
      arrive, invalidly. So now there are extra checks after an ACL has run for
      HELO/EHLO and after the predata ACL, and likewise for MAIL and RCPT when
      pipelining has not been advertised.

PH/30 MH's patch to allow iscntrl() characters to be list separators.

PH/31 Unlike :fail:, a custom message specified with :defer: was not being
      returned in the SMTP response when smtp_return_error_details was false.
      This has been fixed.

PH/32 Change the Dovecot authenticator to use read() and write() on the socket
      instead of the C I/O that was originally supplied, because problems were
      reported on Solaris.

PH/33 Compile failed with OpenSSL 0.9.8e. This was due to a coding error in
      Exim which did not show up earlier: it was assuming that a call to
      SSL_CTX_set_info_callback() might give an error value. In fact, there is
      no error. In previous releases of OpenSSL, SSL_CTX_set_info_callback()
      was a macro that became an assignment, so it seemed to work. This has
      changed to a proper function call with a void return, hence the compile
      error. Exim's code has been fixed.

PH/34 Change HDA_SIZE in oracle.c from 256 to 512. This is needed for 64-bit
      cpus.

PH/35 Applied a patch from the Sieve maintainer which fixes a bug in "notify".

PH/36 Applied John Jetmore's patch to add -v functionality to exigrep.

PH/37 If a message is not accepted after it has had an id assigned (e.g.
      because it turns out to be too big or there is a timeout) there is no
      "Completed" line in the log. When some messages of this type were
      selected by exigrep, they were listed as "not completed". Others were
      picked up by some special patterns. I have improved the selection
      criteria to be more general.

PH/38 The host_find_failed option in the manualroute router can now be set
      to "ignore", to completely ignore a host whose IP address cannot be
      found. If all hosts are ignored, the behaviour is controlled by the new
      host_all_ignored option.

PH/39 In a list of hosts for manualroute, if one item (either because of multi-
      homing or because of multiple MX records with /mx) generated more than
      one IP address, and the following item turned out to be the local host,
      all the secondary addresses of the first item were incorrectly removed
      from the list, along with the local host and any following hosts (which
      is what is supposed to happen).

PH/40 When Exim receives a message, it writes the login name, uid, and gid of
      whoever called Exim into the -H file. In the case of the daemon it was
      behaving confusingly. When first started, it used values for whoever
      started the daemon, but after a SIGHUP it used the Exim user (because it
      calls itself on a restart). I have changed the code so that it now always
      uses the Exim user.

PH/41 (Following a suggestion from Tony Finch) If all the RCPT commands in a
      message are rejected with the same error (e.g. no authentication or bad
      sender address), and a DATA command is nevertheless sent (as can happen
      with PIPELINING or a stupid MUA), the error message that was given to the
      RCPT commands is included in the rejection of the DATA command. This is
      intended to be helpful for MUAs that show only the final error to their
      users.

PH/42 Another patch from the Sieve maintainer.

SC/02 Eximstats - Differentiate between permanent and temporary rejects.
      Eximstats - Fixed some broken HTML links and added missing column headers
                  (Jez Hancock).
      Eximstats - Fixed Grand Total Summary Domains, Edomains, and Email
                  columns for Rejects, Temp Rejects, Ham, and Spam rows.

SC/03 Eximstats - V1.58 Fix to get <> and blackhole to show in edomain tables.

PH/43 Yet another patch from the Sieve maintainer.

PH/44 I found a way to check for a TCP/IP connection going away before sending
      the response to the final '.' that terminates a message, but only in the
      case where the client has not sent further data following the '.'
      (unfortunately, this is allowed). However, in many cases there won't be
      any further data because there won't be any more messages to send. A call
      to select() can be used: if it shows that the input is "ready", there is
      either input waiting, or the socket has been closed. An attempt to read
      the next input character can distinguish the two cases. Previously, Exim
      would have sent an OK response which the client would never have see.
      This could lead to message repetition. This fix should cure that, at
      least in a lot of common cases.

PH/45 Do not advertise STARTTLS in response to HELP unless it would be
      advertised in response to EHLO.


Exim version 4.66
-----------------

PH/01 Two more bugs that were introduced by 4.64/PH/07, in addition to the one
      fixed by 4.65/MH/01 (is this a record?) are fixed:

      (i)  An empty string was always treated as zero by the numeric comparison
           operators. This behaviour has been restored.

      (ii) It is documented that the numeric comparison operators always treat
           their arguments as decimal numbers. This was broken in that numbers
           starting with 0 were being interpreted as octal.

      While fixing these problems I realized that there was another issue that
      hadn't been noticed. Values of message_size_limit (both the global option
      and the transport option) were treated as octal if they started with 0.
      The documentation was vague. These values are now always treated as
      decimal, and I will make that clear in the documentation.


Exim version 4.65
-----------------

TK/01 Disable default definition of HAVE_LINUX_SENDFILE. Clashes with
      Linux large file support (_FILE_OFFSET_BITS=64) on older glibc
      versions. (#438)

MH/01 Don't check that the operands of numeric comparison operators are
      integers when their expansion is in "skipping" mode (fixes bug
      introduced by 4.64-PH/07).

PH/01 If a system filter or a router generates more than SHRT_MAX (32767)
      child addresses, Exim now panics and dies. Previously, because the count
      is held in a short int, deliveries were likely to be lost. As such a
      large number of recipients for a single message is ridiculous
      (performance will be very, very poor), I have chosen to impose a limit
      rather than extend the field.


Exim version 4.64
-----------------

TK/01 Bugzilla #401. Fix DK spooling code so that it can overwrite a
      leftover -K file (the existence of which was triggered by #402).
      While we were at it, introduced process PID as part of the -K
      filename. This should rule out race conditions when creating
      these files.

TK/02 Bugzilla #402. Apply patch from Simon Arlott, speeding up DK signing
      processing considerably. Previous code took too long for large mails,
      triggering a timeout which in turn triggers #401.

TK/03 Introduced HAVE_LINUX_SENDFILE to os.h-Linux. Currently only used
      in the DK code in transports.c. sendfile() is not really portable,
      hence the _LINUX specificness.

TF/01 In the add_headers option to the mail command in an Exim filter,
      there was a bug that Exim would claim a syntax error in any
      header after the first one which had an odd number of characters
      in the field name.

PH/01 If a server that rejects MAIL FROM:<> was the target of a sender
      callout verification, Exim cached a "reject" for the entire domain. This
      is correct for most verifications, but it is not correct for a recipient
      verification with use_sender or use_postmaster set, because in that case
      the callout does not use MAIL FROM:<>. Exim now distinguishes the special
      case of MAIL FROM:<> rejection from other early rejections (e.g.
      rejection of HELO). When verifying a recipient using a non-null MAIL
      address, the cache is ignored if it shows MAIL FROM:<> rejection.
      Whatever the result of the callout, the value of the domain cache is
      left unchanged (for any other kind of callout, getting as far as trying
      RCPT means that the domain itself is ok).

PH/02 Tidied a number of unused variable and signed/unsigned warnings that
      gcc 4.1.1 threw up.

PH/03 On Solaris, an unexpectedly close socket (dropped connection) can
      manifest itself as EPIPE rather than ECONNECT. When tidying away a
      session, the daemon ignores ECONNECT errors and logs others; it now
      ignores EPIPE as well.

PH/04 Applied Nico Erfurth's refactoring patch to tidy up mime.c
      (quoted-printable decoding).

PH/05 Applied Nico Erfurth's refactoring patch to tidy up spool_mbox.c, and
      later the small subsequent patch to fix an introduced bug.

PH/06 Installed the latest Cygwin Makefile from the Cygwin maintainer.

PH/07 There was no check for overflow in expansions such as ${if >{1}{4096M}}.

PH/08 An error is now given if message_size_limit is specified negative.

PH/09 Applied and tidied up Jakob Hirsch's patch for allowing ACL variables
      to be given (somewhat) arbitrary names.

JJ/01 exipick 20060919.0, allow for arbitrary acl_ variables introduced
      in 4.64-PH/09.

JJ/02 exipick 20060919.0, --show-vars args can now be regular expressions,
      miscellaneous code fixes

PH/10 Added the log_reject_target ACL modifier to specify where to log
      rejections.

PH/11 Callouts were setting the name used for EHLO/HELO from $smtp_active_
      hostname. This is wrong, because it relates to the incoming message (and
      probably the interface on which it is arriving) and not to the outgoing
      callout (which could be using a different interface). This has been
      changed to use the value of the helo_data option from the smtp transport
      instead - this is what is used when a message is actually being sent. If
      there is no remote transport (possible with a router that sets up host
      addresses), $smtp_active_hostname is used.

PH/12 Installed Andrey Panin's patch to add a dovecot authenticator. Various
      tweaks were necessary in order to get it to work (see also 21 below):
      (a) The code assumed that strncpy() returns a negative number on buffer
          overflow, which isn't the case. Replaced with Exim's string_format()
          function.
      (b) There were several signed/unsigned issues. I just did the minimum
          hacking in of casts. There is scope for a larger refactoring.
      (c) The code used strcasecmp() which is not a standard C function.
          Replaced with Exim's strcmpic() function.
      (d) The code set only $1; it now sets $auth1 as well.
      (e) A simple test gave the error "authentication client didn't specify
          service in request". It would seem that Dovecot has changed its
          interface. Fortunately there's a specification; I followed it and
          changed what the client sends and it appears to be working now.

PH/13 Added $message_headers_raw to provide the headers without RFC 2047
      decoding.

PH/14 Corrected misleading output from -bv when -v was also used. Suppose the
      address A is aliased to B and C, where B exists and C does not. Without
      -v the output is "A verified" because verification stops after a
      successful redirection if more than one address is generated. However,
      with -v the child addresses are also verified. Exim was outputting "A
      failed to verify" and then showing the successful verification for C,
      with its parentage. It now outputs "B failed to verify", showing B's
      parentage before showing the successful verification of C.

PH/15 Applied Michael Deutschmann's patch to allow DNS black list processing to
      look up a TXT record in a specific list after matching in a combined
      list.

PH/16 It seems that the options setting for the resolver (RES_DEFNAMES and
      RES_DNSRCH) can affect the behaviour of gethostbyname() and friends when
      they consult the DNS. I had assumed they would set it the way they
      wanted; and indeed my experiments on Linux seem to show that in some
      cases they do (I could influence IPv6 lookups but not IPv4 lookups).
      To be on the safe side, however, I have now made the interface to
      host_find_byname() similar to host_find_bydns(), with an argument
      containing the DNS resolver options. The host_find_byname() function now
      sets these options at its start, just as host_find_bydns() does. The smtp
      transport options dns_qualify_single and dns_search_parents are passed to
      host_find_byname() when gethostbyname=TRUE in this transport. Other uses
      of host_find_byname() use the default settings of RES_DEFNAMES
      (qualify_single) but not RES_DNSRCH (search_parents).

PH/17 Applied (a modified version of) Nico Erfurth's patch to make
      spool_read_header() do less string testing, by means of a preliminary
      switch on the second character of optional "-foo" lines. (This is
      overdue, caused by the large number of possibilities that now exist.
      Originally there were few.) While I was there, I also converted the
      str(n)cmp tests so they don't re-test the leading "-" and the first
      character, in the hope this might squeeze out yet more improvement.

PH/18 Two problems with "group" syntax in header lines when verifying: (1) The
      flag allowing group syntax was set by the header_syntax check but not
      turned off, possible causing trouble later; (2) The flag was not being
      set at all for the header_verify test, causing "group"-style headers to
      be rejected. I have now set it in this case, and also caused header_
      verify to ignore an empty address taken from a group. While doing this, I
      came across some other cases where the code for allowing group syntax
      while scanning a header line wasn't quite right (mostly, not resetting
      the flag correctly in the right place). These bugs could have caused
      trouble for malformed header lines. I hope it is now all correct.

PH/19 The functions {pwcheck,saslauthd}_verify_password() are always called
      with the "reply" argument non-NULL. The code, however (which originally
      came from elsewhere) had *some* tests for NULL when it wrote to *reply,
      but it didn't always do it. This confused somebody who was copying the
      code for some other use. I have removed all the tests.

PH/20 It was discovered that the GnuTLS code had support for RSA_EXPORT, a
      feature that was used to support insecure browsers during the U.S. crypto
      embargo. It requires special client support, and Exim is probably the
      only MTA that supported it -- and would never use it because real RSA is
      always available. This code has been removed, because it had the bad
      effect of slowing Exim down by computing (never used) parameters for the
      RSA_EXPORT functionality.

PH/21 On the advice of Timo Sirainen, added a check to the dovecot
      authenticator to fail if there's a tab character in the incoming data
      (there should never be unless someone is messing about, as it's supposed
      to be base64-encoded). Also added, on Timo's advice, the "secured" option
      if the connection is using TLS or if the remote IP is the same as the
      local IP, and the "valid-client-cert option" if a client certificate has
      been verified.

PH/22 As suggested by Dennis Davis, added a server_condition option to *all*
      authenticators. This can be used for authorization after authentication
      succeeds. (In the case of plaintext, it servers for both authentication
      and authorization.)

PH/23 Testing for tls_required and lost_connection in a retry rule didn't work
      if any retry times were supplied.

PH/24 Exim crashed if verify=helo was activated during an incoming -bs
      connection, where there is no client IP address to check. In this
      situation, the verify now always succeeds.

PH/25 Applied John Jetmore's -Mset patch.

PH/26 Added -bem to be like -Mset, but loading a message from a file.

PH/27 In a string expansion for a processed (not raw) header when multiple
      headers of the same name were present, leading whitespace was being
      removed from all of them, but trailing whitespace was being removed only
      from the last one. Now trailing whitespace is removed from each header
      before concatenation. Completely empty headers in a concatenation (as
      before) are ignored.

PH/28 Fixed bug in backwards-compatibility feature of PH/09 (thanks to John
      Jetmore). It would have mis-read ACL variables from pre-4.61 spool files.

PH/29 [Removed. This was a change that I later backed out, and forgot to
      correct the ChangeLog entry (that I had efficiently created) before
      committing the later change.]

PH/30 Exim was sometimes attempting to deliver messages that had suffered
      address errors (4xx response to RCPT) over the same connection as other
      messages routed to the same hosts. Such deliveries are always "forced",
      so retry times are not inspected. This resulted in far too many retries
      for the affected addresses. The effect occurred only when there were more
      hosts than the hosts_max_try setting in the smtp transport when it had
      the 4xx errors. Those hosts that it had tried were not added to the list
      of hosts for which the message was waiting, so if all were tried, there
      was no problem. Two fixes have been applied:

      (i)  If there are any address or message errors in an SMTP delivery, none
           of the hosts (tried or untried) are now added to the list of hosts
           for which the message is waiting, so the message should not be a
           candidate for sending over the same connection that was used for a
           successful delivery of some other message. This seems entirely
           reasonable: after all the message is NOT "waiting for some host".
           This is so "obvious" that I'm not sure why it wasn't done
           previously. Hope I haven't missed anything, but it can't do any
           harm, as the worst effect is to miss an optimization.

      (ii) If, despite (i), such a delivery is accidentally attempted, the
           routing retry time is respected, so at least it doesn't keep
           hammering the server.

PH/31 Installed Andrew Findlay's patch to close the writing end of the socket
      in ${readsocket because some servers need this prod.

PH/32 Added some extra debug output when updating a wait-xxx database.

PH/33 The hint "could be header name not terminated by colon", which has been
      given for certain expansion errors for a long time, was not being given
      for the ${if def:h_colon_omitted{...  case.

PH/34 The spec says: "With one important exception, whenever a domain list is
      being scanned, $domain contains the subject domain." There was at least
      one case where this was not true.

PH/35 The error "getsockname() failed: connection reset by peer" was being
      written to the panic log as well as the main log, but it isn't really
      panic-worthy as it just means the connection died rather early on. I have
      removed the panic log writing for the ECONNRESET error when getsockname()
      fails.

PH/36 After a 4xx response to a RCPT error, that address was delayed (in queue
      runs only) independently of the message's sender address. This meant
      that, if the 4xx error was in fact related to the sender, a different
      message to the same recipient with a different sender could confuse
      things. In particualar, this can happen when sending to a greylisting
      server, but other circumstances could also provoke similar problems.
      I have changed the default so that the retry time for these errors is now
      based a combination of the sender and recipient addresses. This change
      can be overridden by setting address_retry_include_sender=false in the
      smtp transport.

PH/37 For LMTP over TCP/IP (the smtp transport), error responses from the
      remote server are returned as part of bounce messages. This was not
      happening for LMTP over a pipe (the lmtp transport), but now it is the
      same for both kinds of LMTP.

PH/38 Despite being documented as not happening, Exim was rewriting addresses
      in header lines that were in fact CNAMEs. This is no longer the case.

PH/39 If -R or -S was given with -q<time>, the effect of -R or -S was ignored,
      and queue runs started by the daemon processed all messages. This has
      been fixed so that -R and -S can now usefully be given with -q<time>.

PH/40 Import PCRE release 6.7 (fixes some bugs).

PH/41 Add bitwise logical operations to eval (courtesy Brad Jorsch).

PH/42 Give an error if -q is specified more than once.

PH/43 Renamed the variables $interface_address and $interface_port as
      $received_ip_address and $received_port, to make it clear that these
      values apply to message reception, and not to the outgoing interface when
      a message is delivered. (The old names remain recognized, of course.)

PH/44 There was no timeout on the connect() call when using a Unix domain
      socket in the ${readsocket expansion. There now is.

PH/45 Applied a modified version of Brad Jorsch's patch to allow "message" to
      be meaningful with "accept".

SC/01 Eximstats V1.43
     Bug fix for V1.42 with -h0 specified. Spotted by Chris Lear.

SC/02 Eximstats V1.44
      Use a glob alias rather than an array ref in the generated
      parser. This improves both readability and performance.

SC/03 Eximstats V1.45 (Marco Gaiarin / Steve Campbell)
      Collect SpamAssassin and rejection statistics.
      Don't display local sender or destination tables unless
      there is data to show.
      Added average volumes into the top table text output.

SC/04 Eximstats V1.46
      Collect data on the number of addresses (recipients)
      as well as the number of messages.

SC/05 Eximstats V1.47
      Added 'Message too big' to the list of mail rejection
      reasons (thanks to Marco Gaiarin).

SC/06 Eximstats V1.48
      Mainlog lines which have GMT offsets and are too short to
      have a flag are now skipped.

SC/07 Eximstats V1.49 (Alain Williams)
      Added the -emptyok flag.

SC/08 Eximstats V1.50
      Fixes for obtaining the IP address from reject messages.

JJ/03 exipick.20061117.2, made header handling as similar to exim as possible
      (added [br]h_ prefixes, implemented RFC2047 decoding.  Fixed
      whitesspace changes from 4.64-PH/27

JJ/04 exipick.20061117.2, fixed format and added $message_headers_raw to
      match 4.64-PH/13

JJ/05 exipick.20061117.2, bug fixes (error out sooner when invalid criteria
      are found, allow negative numbers in numeric criteria)

JJ/06 exipick.20061117.2, added new $message_body_missing variable

JJ/07 exipick.20061117.2, added $received_ip_address and $received_port
      to match changes made in 4.64-PH/43

PH/46 Applied Jori Hamalainen's patch to add features to exiqsumm.

PH/47 Put in an explicit test for a DNS lookup of an address record where the
      "domain" is actually an IP address, and force a failure. This locks out
      those revolvers/nameservers that support "A-for-A" lookups, in
      contravention of the specifications.

PH/48 When a host name was looked up from an IP address, and the subsequent
      forward lookup of the name timed out, the host name was left in
      $sender_host_name, contrary to the specification.

PH/49 Although default lookup types such as lsearch* or cdb*@ have always been
      restricted to single-key lookups, Exim was not diagnosing an error if
      * or *@ was used with a query-style lookup.

PH/50 Increased the value of DH_BITS in tls-gnu.c from 768 to 1024.

MH/01 local_scan ABI version incremented to 1.1. It should have been updated
      long ago, but noone interested enough thought of it. Let's just say that
      the "1.1" means that there are some new functions that weren't there at
      some point in the past.

PH/51 Error processing for expansion failure of helo_data from an smtp
      transport during callout processing was broken.

PH/52 Applied John Jetmore's patch to allow tls-on-connect and STARTTLS to be
      tested/used via the -bh/-bhc/-bs options.

PH/53 Added missing "#include <time.h>" to pcre/pcretest.c (this was a PCRE
      bug, fixed in subsequent PCRE releases).

PH/54 Applied Robert Bannocks' patch to avoid a problem with references that
      arises when using the Solaris LDAP libraries (but not with OpenLDAP).

PH/55 Check for a ridiculously long file name in exim_dbmbuild.


Exim version 4.63
-----------------

SC/01 Use a glob alias rather than an array ref in eximstats generated
      parser. This improves both readability and performance.

SC/02 Collect SpamAssassin and rejection statistics in eximstats.
      Don't display local sender or destination tables in eximstats unless
      there is data to show.
      Added average volumes into the eximstats top table text output.

SC/03 Collect data on the number of addresses (recipients) as well
      as the number of messages in eximstats.

TF/01 Correct an error in the documentation for the redirect router. Exim
      does (usually) call initgroups() when daemonizing.

TF/02 Call initgroups() when dropping privilege in exim.c, so that Exim runs
      with consistent privilege compared to when running as a daemon.

TF/03 Note in the spec that $authenticated_id is not set for local
      submissions from trusted users.

TF/04 The ratelimit per_rcpt option now works correctly in acl_not_smtp.
      Thanks to Dean Brooks <dean@iglou.com> for the patch.

TF/05 Make it easier to get SMTP authentication and TLS/SSL support working
      by adding some example configuration directives to the default
      configuration file. A little bit of work is required to uncomment the
      directives and define how usernames and passwords are checked, but
      there is now a framework to start from.

PH/01 Added #define LDAP_DEPRECATED 1 to ldap.c because some of the "old"
      functions that Exim currently uses aren't defined in ldap.h for OpenLDAP
      without this. I don't know how relevant this is to other LDAP libraries.

PH/02 Add the verb name to the "unknown ACL verb" error.

PH/03 Magnus Holmgren's patch for filter_prepend_home.

PH/03 Fixed Bugzilla #101: macro definition between ACLs doesn't work.

PH/04 Applied Magnus Holmgren's patch to fix Bugzilla #98: transport's home
      directory not expanded when it should be if an expanded home directory
      was set for the address (which is overridden by the transport).

PH/05 Applied Alex Kiernan's patch to fix Bugzilla #99: a problem with
      libradius.

PH/06 Added acl_not_smtp_start, based on Johannes Berg's patch, and set the
      bit to forbid control=suppress_local_fixups in the acl_not_smtp ACL,
      because it is too late at that time, and has no effect.

PH/07 Changed ${quote_pgsql to quote ' as '' instead of \' because of a
      security issue with \' (bugzilla #107). I could not use the
      PQescapeStringConn() function, because it needs a PGconn value as one of
      its arguments.

PH/08 When testing addresses using -bt, indicate those final addresses that
      are duplicates that would not cause an additional delivery. At least one
      person was confused, thinking that -bt output corresponded to deliveries.
      (Suppressing duplicates isn't a good idea as you lose the information
      about possibly different redirections that led to the duplicates.)

PH/09 Applied patch from Erik to use select() instead of poll() in spam.c on
      systems where poll() doesn't work, in particular OS X.

PH/10 Added more information to debugging output for retry time not reached.

PH/11 Applied patch from Arkadiusz Miskiewicz to apply a timeout to read
      operations in malware.c.

PH/12 Applied patch from Magnus Holmgren to include the "h" tag in Domain Keys
      signatures.

PH/13 If write_rejectlog was set false when logging was sent to syslog with
      syslog_duplication set false, log lines that would normally be written
      both the the main log and to the reject log were not written to syslog at
      all.

PH/14 In the default configuration, change the use of "message" in ACL warn
      statements to "add_header".

PH/15 Diagnose a filter syntax error for "seen", "unseen", or "noerror" if not
      not followed by a command (e.g. "seen endif").

PH/16 Recognize SMTP codes at the start of "message" in ACLs and after :fail:
      and :defer: in a redirect router. Add forbid_smtp_code to suppress the
      latter.

PH/17 Added extra conditions to the default value of delay_warning_condition
      so that it is now:

        ${if or { \
            { !eq{$h_list-id:$h_list-post:$h_list-subscribe:}{} } \
            { match{$h_precedence:}{(?i)bulk|list|junk} } \
            { match{$h_auto-submitted:}{(?i)auto-generated|auto-replied} } \
            }{no}{yes}}

      The Auto-Submitted: and various List- headers are standardised, whereas I
      don't think Precedence: ever was.

PH/18 Refactored debugging code in route_finduser() to show more information,
      in particular, the error code if getpwnam() issues one.

PH/19 Added PQsetClientEncoding(conn, "SQL_ASCII") to the pgsql code module.
      This is apparently needed in addition to the PH/07 change above to avoid
      any possible encoding problems.

PH/20 Perl can change the locale. Exim was resetting it after a ${perl call,
      but not after initializing Perl.

PH/21 Added a call to PQsetNoticeProcessor() to catch pgsql "notices" and
      output them only if debugging. By default they are written stderr,
      apparently, which is not desirable.

PH/22 Added Alain Williams' LDAP patch to support setting REFERRALS=off on
      queries.

JJ/01 exipick: added --reverse (and -R synonym), --random, --size, --sort and
      --not options

JJ/02 exipick: rewrote --help documentation to hopefully make more clear.

PH/23 Made -oMaa and -oMt work with -bh and -bs to pretend the connection is
      authenticated or an ident call has been made. Suppress the default
      values for $authenticated_id and $authenticated_sender (but permit -oMai
      and -oMas) when testing with -bh.

PH/24 Re-jigged the order of the tests in the default configuration so that the
      tests for valid domains and recipients precede the DNS black list and CSA
      tests, on the grounds that those ones are more expensive.

PH/25 Exim was not testing for a space following SMTP commands such as EHLO
      that require one. Thus, EHLORHUBARB was interpreted as a valid command.
      This bug exists in every version of Exim that I still have, right back to
      0.12.

PH/26 (n)wildlsearch lookups are documented as being done case-insensitively.
      However, an attempt to turn on case-sensitivity in a regex key by
      including (?-i) didn't work because the subject string was already
      lowercased, and the effects were non-intuitive. It turns out that a
      one-line patch can be used to allow (?-i) to work as expected.


Exim version 4.62
-----------------

TF/01 Fix the add_header change below (4.61 PH/55) which had a bug that (amongst
      other effects) broke the use of negated acl sub-conditions.

PH/01 ${readsocket now supports Internet domain sockets (modified John Jetmore
      patch).

PH/02 When tcp-wrappers is called from Exim, it returns only "deny" or "allow".
      "Deny" causes Exim to reject the incoming connection with a 554 error.
      Unfortunately, if there is a major crisis, such as a disk failure,
      tcp-wrappers gives "deny", whereas what one would like would be some
      kind of temporary error. A kludge has been added to help with this.
      Before calling hosts_ctl(), errno is set zero. If the result is "deny", a
      554 error is used if errno is still zero or contains ENOENT (which occurs
      if either of the /etc/hosts.{allow,deny} files is missing). Otherwise, a
      451 error is used.

PH/03 Add -lutil to the default FreeBSD LIBS setting.

PH/04 Change PH/19 for 4.61 was too wide. It should not be applied to host
      errors. Otherwise a message that provokes a temporary error (when other
      messages do not) can cause a whole host to time out.

PH/05 Batch deliveries by appendfile and pipe transports did not work when the
      addresses were routed directly to files or pipes from a redirect router.
      File deliveries just didn't batch; pipe deliveries might have suffered
      odd errors.

PH/06 A failure to get a lock for a hints database would erroneously always say
      "Failed to get write lock", even when it was really a read lock.

PH/07 The appendfile transport was creating MBX lock files with a fixed mode
      of 0600. This has been changed to use the value of the lockfile_mode
      option (which defaults to 0600).

PH/08 Applied small patch from the Sieve maintainer.

PH/09 If maildir_quota_directory_regex was set to exclude (say) the .Trash
      folder from quota calculations, a direct delivery into this folder messed
      up the contents of the maildirsize file. This was because the regex was
      used only to exclude .Trash (or whatever) when the size of the mailbox
      was calculated. There was no check that a delivery was happening into an
      excluded directory. This bug has been fixed by ignoring all quota
      processing for deliveries into excluded directories.

PH/10 Added the maildirfolder_create_regex option to appendfile.


Exim version 4.61
-----------------

PH/01 The code for finding all the local interface addresses on a FreeBSD
      system running IPv6 was broken. This may well have applied to all BSD
      systems, as well as to others that have similar system calls. The broken
      code found IPv4 interfaces correctly, but gave incorrect values for the
      IPv6 interfaces. In particular, ::1 was not found. The effect in Exim was
      that it would not match correctly against @[] and not recognize the IPv6
      addresses as local.

PH/02 The ipliteral router was not recognizing addresses of the form user@
      [ipv6:....] because it didn't know about the "ipv6:" prefix.

PH/03 Added disable_ipv6.

PH/04 Changed $reply_address to use the raw form of the headers instead of the
      decoded form, because it is most often used to construct To: headers
      lines in autoreplies, and the decoded form may well be syntactically
      invalid. However, $reply_address has leading white space removed, and all
      newlines turned into spaces so that the autoreply transport does not
      grumble.

PH/05 If group was specified without a user on a router, and no group or user
      was specified on a transport, the group from the router was ignored.

PH/06 Increased the number of ACL variables to 20 of each type, and arranged
      for visible compile-time settings that can be used to change these
      numbers, for those that want even more. Backwards compatibility with old
      spool files has been maintained. However, going back to a previous Exim
      release will lost any variables that are in spool files.

PH/07 Two small changes when running in the test harness: increase delay when
      passing a TCP/IP connection to a new process, in case the original
      process has to generate a bounce, and remove special handling of
      127.0.0.2 (sic), which is no longer necessary.

PH/08 Changed debug output of dbfn_open() flags from numbers to names, so as to
      be the same on different OS.

PH/09 Moved a debug statement in filter processing to avoid a race problem when
      testing.

JJ/01 exipick: fixed bug where -b (brief) output option showed "Vars:"
      whether --show-vars was specified or not

JJ/02 exipick: Added support for new ACL variable spool format introduced
      in 4.61-PH/06

PH/10 Fixed another bug related to PH/04 above: if an incoming message had a
      syntactically invalid From: or Reply-to: line, and a filter used this to
      generate an autoreply, and therefore failed to obtain an address for the
      autoreply, Exim could try to deliver to a non-existent relative file
      name, causing unrelated and misleading errors. What now happens is that
      it logs this as a hard delivery error, but does not attempt to create a
      bounce message.

PH/11 The exinext utility has a -C option for testing purposes, but although
      the given file was scanned by exinext itself; it wasn't being passed on
      when Exim was called.

PH/12 In the smtp transport, treat an explicit ECONNRESET error the same as
      an end-of-file indication when reading a command response.

PH/13 Domain literals for IPv6 were not recognized unless IPv6 support was
      compiled. In many other places in Exim, IPv6 addresses are always
      recognized, so I have changed this. It also means that IPv4 domain
      literals of the form [IPV4:n.n.n.n] are now always recognized.

PH/14 When a uid/gid is specified for the queryprogram router, it cannot be
      used if the router is not running as root, for example, when verifying at
      ACL time, or when using -bh. The debugging output from this situation was
      non-existent - all you got was a failure to exec. I have made two
      changes:

      (a) Failures to set uid/gid, the current directory, or a process leader
          in a subprocess such as that created by queryprogram now generate
          suitable debugging ouput when -d is set.

      (b) The queryprogram router detects when it is not running as root,
          outputs suitable debugging information if -d is set, and then runs
          the subprocess without attempting to change uid/gid.

PH/15 Minor change to Makefile for building test_host (undocumented testing
      feature).

PH/16 As discussed on the list in Nov/Dec: Exim no longer looks at the
      additional section of a DNS packet that returns MX or SRV records.
      Instead, it always explicitly searches for A/AAAA records. This avoids
      major problems that occur when a DNS server includes only records of one
      type (A or AAAA) in an MX/SRV packet. A byproduct of this change has
      fixed another bug: if SRV records were looked up and the corresponding
      address records were *not* found in the additional section, the port
      values from the SRV records were lost.

PH/17 If a delivery to a pipe, file, or autoreply was deferred, Exim was not
      using the correct key (the original address) when searching the retry
      rules in order to find which one to use for generating the retry hint.

PH/18 If quota_warn_message contains a From: header, Exim now refrains from
      adding the default one. Similarly, if it contains a Reply-To: header, the
      errors_reply_to option, if set, is not used.

PH/19 When calculating a retry time, Exim used to measure the "time since
      failure" by looking at the "first failed" field in the retry record. Now
      it does not use this if it is later than than the arrival time of the
      message. Instead it uses the arrival time. This makes for better
      behaviour in cases where some deliveries succeed, thus re-setting the
      "first failed" field. An example is a quota failure for a huge message
      when small messages continue to be delivered. Without this change, the
      "time since failure" will always be short, possible causing more frequent
      delivery attempts for the huge message than are intended.
      [Note: This change was subsequently modified - see PH/04 for 4.62.]

PH/20 Added $auth1, $auth2, $auth3 to contain authentication data (as well as
      $1, $2, $3) because the numerical variables can be reset during some
      expansion items (e.g. "match"), thereby losing the authentication data.

PH/21 Make -bV show the size of off_t variables so that the test suite can
      decide whether to run tests for quotas > 2G.

PH/22 Test the values given for quota, quota_filecount, quota_warn_threshold,
      mailbox_size, and mailbox_filecount in the appendfile transport. If a
      filecount value is greater than 2G or if a quota value is greater than 2G
      on a system where the size of off_t is not greater than 4, a panic error
      is given.

PH/23 When a malformed item such as 1.2.3/24 appears in a host list, it can
      never match. The debug and -bh output now contains an explicit error
      message indicating a malformed IPv4 address or mask.

PH/24 An host item such as 1.2.3.4/abc was being treated as the IP address
      1.2.3.4 without a mask. Now it is not recognized as an IP address, and
      PH/23 above applies.

PH/25 Do not write to syslog when running in the test harness. The only
      occasion when this arises is a failure to open the main or panic logs
      (for which there is an explicit test).

PH/26 Added the /no_tell option to "control=freeze".

PH/27 If a host name lookup failed very early in a connection, for example, if
      the IP address matched host_lookup and the reverse lookup yielded a name
      that did not have a forward lookup, an error message of the form "no IP
      address found for host xxx.xxx.xxx (during SMTP connection from NULL)"
      could be logged. Now it outputs the IP address instead of "NULL".

PH/28 An enabling patch from MH: add new function child_open_exim2() which
      allows the sender and the authenticated sender to be set when
      submitting a message from within Exim. Since child_open_exim() is
      documented for local_scan(), the new function should be too.

PH/29 In GnuTLS, a forced expansion failure for tls_privatekey was not being
      ignored. In both GnuTLS and OpenSSL, an expansion of tls_privatekey that
      results in an empty string is now treated as unset.

PH/30 Fix eximon buffer overflow bug (Bugzilla #73).

PH/31 Added sender_verify_fail logging option.

PH/32 In November 2003, the code in Exim that added an empty Bcc: header when
      needed by RFC 822 but not by RFC 2822 was commented out. I have now
      tidied the source and removed it altogether.

PH/33 When a queue run was abandoned because the load average was too high, a
      log line was always written; now it is written only if the queue_run log
      selector is set. In addition, the log line for abandonment now contains
      information about the queue run such as the pid. This is always present
      in "start" and "stop" lines but was omitted from the "abandon" line.

PH/34 Omit spaces between a header name and the colon in the error message that
      is given when verify = headers_syntax fails (if there are lots of them,
      the message gets confusing).

PH/35 Change the default for dns_check_names_pattern to allow slashes within
      names, as there are now some PTR records that contain slashes. This check
      is only to protect against broken name servers that fall over on strange
      characters, so the fact that it applies to all lookups doesn't matter.

PH/36 Now that the new test suite is complete, we can remove some of the
      special code in Exim that was needed for the old test suite. For example,
      sorting DNS records because real resolvers return them in an arbitrary
      order. The new test suite's fake resolver always returns records in the
      same order.

PH/37 When running in the test harness, use -odi for submitted messages (e.g.
      bounces) except when queue_only is set, to avoid logging races between
      the different processes.

PH/38 Panic-die if .include specifies a non-absolute path.

PH/39 A tweak to the "H" retry rule from its user.

JJ/03 exipick: Removed parentheses from 'next' and 'last' calls that specified
      a label.  They prevented compilation on older perls.

JJ/04 exipick: Refactored code to prevent implicit split to @_ which caused
      a warning to be raised on newish perls.

JJ/05 exipick: Fixed bug where -bpc always showed a count of all messages
      on queue.  Changes to match documented behaviour of showing count of
      messages matching specified criteria.

PH/40 Changed the default ident timeout from 30s to 5s.

PH/41 Added support for the use of login_cap features, on those BSD systems
      that have them, for controlling the resources used by pipe deliveries.

PH/42 The content-scanning code uses fopen() to create files in which to put
      message data. Previously it was not paying any attention to the mode of
      the files. Exim runs with umask(0) because the rest of the code creates
      files with open(), and sets the required mode explicitly. Thus, these
      files were ending up world-writeable. This was not a big issue, because,
      being within the spool directory, they were not world-accessible. I have
      created a function called modefopen, which takes an additional mode
      argument. It sets umask(777), creates the file, chmods it to the required
      mode, then resets the umask. All the relevant calls to fopen() in the
      content scanning code have been changed to use this function.

PH/43 If retry_interval_max is set greater than 24 hours, it is quietly reset
      to 24 hours. This avoids potential overflow problems when processing G
      and H retry rules. I suspect nobody ever tinkers with this value.

PH/44 Added STRIP_COMMAND=/usr/bin/strip to the FreeBSD Makefile.

PH/45 When the plaintext authenticator is running as a client, the server's
      challenges are checked to ensure they are valid base64 strings. By
      default, the authentication attempt is cancelled if an invalid string is
      received. Setting client_ignore_invalid_base64 true ignores these errors.
      The decoded challenge strings are now placed in $auth1, $auth2, etc. as
      they are received. Thus, the responses can be made to depend on the
      challenges. If an invalid string is ignored, an empty string is placed in
      the variable.

PH/46 Messages that are created by the autoreply transport now contains a
      References: header, in accordance with RFCs 2822 and 3834.

PH/47 Added authenticated_sender_force to the smtp transport.

PH/48 The ${prvs expansion was broken on systems where time_t was long long.

PH/49 Installed latest patch from the Sieve maintainer.

PH/50 When an Exim quota was set without a file count quota, and mailbox_size
      was also set, the appendfile transport was unnecessarily scanning a
      directory of message files (e.g. for maildir delivery) to find the count
      of files (along with the size), even though it did not need this
      information. It now does the scan only if it needs to find either the
      size of the count of files.

PH/51 Added ${time_eval: to convert Exim time strings into seconds.

PH/52 Two bugs concerned with error handling when the smtp transport is
      used in LMTP mode:

      (i) Exim was not creating retry information for temporary errors given
      for individual recipients after the DATA command when the smtp transport
      was used in LMTP mode. This meant that they could be retried too
      frequently, and not timed out correctly.

      (ii) Exim was setting the flag that allows error details to be returned
      for LMTP errors on RCPT commands, but not for LMTP errors for individual
      recipients that were returned after the DATA command.

PH/53 This is related to PH/52, but is more general: for any failing address,
      when detailed error information was permitted to be returned to the
      sender, but the error was temporary, then after the final timeout, only
      "retry timeout exceeded" was returned. Now it returns the full error as
      well as "retry timeout exceeded".

PH/54 Added control=allow_auth_unadvertised, as it seems there are clients that
      do this, and (what is worse) MTAs that accept it.

PH/55 Added the add_header modified to ACLs. The use of "message" with "warn"
      will now be deprecated.

PH/56 New os.c-cygwin from the Cygwin maintainer.

JJ/06 exipick: added --unsorted option to allow unsorted output in all output
      formats (previously only available in exim formats via -bpr, -bpru,
      and -bpra.  Now also available in native and exiqgrep formats)

JJ/07 exipick: added --freeze and --thaw options to allow faster interaction
      with very large, slow to parse queues

JJ/08 exipick: added ! as generic prefix to negate any criteria format

JJ/09 exipick: miscellaneous performance enhancements (~24% improvements)

PH/57 Tidies in SMTP dialogue display in debug output: (i) It was not showing
      responses to authentication challenges, though it was showing the
      challenges; (ii) I've removed the CR characters from the debug output for
      SMTP output lines.

PH/58 Allow for the insertion of a newline as well as a space when a string
      is turned into more than one encoded-word during RFC 2047 encoding. The
      Sieve code now uses this.

PH/59 Added the following errors that can be detected in retry rules: mail_4xx,
      data_4xx, lost_connection, tls_required.

PH/60 When a VRFY deferred or FAILED, the log message rather than the user
      message was being sent as an SMTP response.

PH/61 Add -l and -k options to exicyclog.

PH/62 When verifying, if an address was redirected to one new address, so that
      verification continued, and the new address failed or deferred after
      having set something in $address_data, the value of $address_data was not
      passed back to the ACL. This was different to the case when no
      redirection occurred. The value is now passed back in both cases.

PH/63 Changed the macro HAVE_LOGIN_CAP (see PH/41 for this release above) to
      HAVE_SETCLASSRESOURCES because there are different APIs in use that all
      use login_cap.h, so on its own it isn't the distinguishing feature. The
      new name refers directly to the setclassresources() function.

PH/65 Added configuration files for NetBSD3.

PH/66 Updated OS/Makefile-HP-UX for gcc 4.1.0 with HP-UX 11.

PH/67 Fixed minor infelicity in the sorting of addresses to ensure that IPv6
      is preferred over IPv4.

PH/68 The bounce_return_message and bounce_return_body options were not being
      honoured for bounces generated during the reception of non-SMTP messages.
      In particular, this applied to messages rejected by the ACL. This bug has
      been fixed. However, if bounce_return_message is true and bounce_return_
      body is false, the headers that are returned for a non-SMTP message
      include only those that have been read before the error was detected.
      (In the case of an ACL rejection, they have all been read.)

PH/69 The HTML version of the specification is now built in a directory called
      spec_html instead of spec.html, because the latter looks like a path with
      a MIME-type, and this confuses some software.

PH/70 Catch two compiler warnings in sieve.c.

PH/71 Fixed an obscure and subtle bug (thanks Alexander & Matthias). The
      function verify_get_ident() calls ip_connect() to connect a socket, but
      if the "connect()" function timed out, ip_connect() used to close the
      socket. However, verify_get_ident() also closes the socket later, and in
      between Exim writes to the log, which may get opened at this point. When
      the socket was closed in ip_connect(), the log could get the same file
      descriptor number as the socket. This naturally causes chaos. The fix is
      not to close the socket in ip_connect(); the socket should be closed by
      the function that creates it. There was only one place in the code where
      this was missing, in the iplookup router, which I don't think anybody now
      uses, but I've fixed it anyway.

PH/72 Make dns_again_means_nonexist apply to lookups using gethostbyname() as
      well as to direct DNS lookups. Otherwise the handling of names in host
      lists is inconsistent and therefore confusing.


Exim version 4.60
-----------------

PH/01 Two changes to the default runtime configuration:

      (1) Move the checks for relay_from_hosts and authenticated clients from
          after to before the (commented out) DNS black list checks.

      (2) Add control=submission to the relay_from_hosts and authenticated
          clients checks, on the grounds that messages accepted by these
          statements are most likely to be submissions.

PH/02 Several tidies to the handling of ${prvs and ${prvscheck:

      (1) Generate an error if the third argument for the ${prvs expansion is
          not a single digit.

      (2) Treat a missing third argument of ${prvscheck as if it were an empty
          string.

      (3) Reset the variables that are obtained from the first argument of
          ${prvscheck and used in the second argument before leaving the code,
          because their memory is reclaimed, so using them afterwards may do
          silly things.

      (4) Tidy up the code for expanding the arguments of ${prvscheck one by
          one (it's much easier than Tom thought :-).

      (5) Because of (4), we can now allow for the use of $prvscheck_result
          inside the third argument.

PH/03 For some reason, the default setting of PATH when running a command from
      a pipe transport was just "/usr/bin". I have changed it to
      "/bin:/usr/bin".

PH/04 SUPPORT_TRANSLATE_IP_ADDRESS and MOVE_FROZEN_MESSAGES did not cause
      anything to be listed in the output from -bV.

PH/05 When a filter generated an autoreply, the entire To: header line was
      quoted in the delivery log line, like this:

        => >A.N.Other <ano@some.domain> <original@ddress> ...

      This has been changed so that it extracts the operative address. There
      may be more than one such address. If so, they are comma-separated, like
      this:

        => >ano@some.domain,ona@other.domain <original@ddress> ...

PH/06 When a client host used a correct literal IP address in a HELO or EHLO
      command, (for example, EHLO [1.2.3.4]) and the client's IP address was
      not being looked up in the rDNS to get a host name, Exim was showing the
      IP address twice in Received: lines, even though the IP addresses were
      identical. For example:

        Received: from [1.2.3.4] (helo=[1.2.3.4])

      However, if the real host name was known, it was omitting the HELO data
      if it matched the actual IP address. This has been tidied up so that it
      doesn't show the same IP address twice.

PH/07 When both +timestamp and +memory debugging was on, the value given by
      $tod_xxx expansions could be wrong, because the tod_stamp() function was
      called by the debug printing, thereby overwriting the timestamp buffer.
      Debugging no longer uses the tod_stamp() function when +timestamp is set.

PH/08 When the original message was included in an autoreply transport, it
      always said "this is a copy of the message, including all the headers",
      even if body_only or headers_only was set. It now gives an appropriate
      message.

PH/09 Applied a patch from the Sieve maintainer which:

      o  fixes some comments
      o  adds the (disabled) notify extension core
      o  adds some debug output for the result of if/elsif tests
      o  points to the current vacation draft in the documentation
         and documents the missing references header update

      and most important:

      o  fixes a bug in processing the envelope test (when testing
         multiple envelope elements, the last element determinted the
         result)

PH/10 Exim was violating RFC 3834 ("Recommendations for Automatic Responses to
      Electronic Mail") by including:

        Auto-submitted: auto-generated

      in the messages that it generates (bounce messages and others, such as
      warnings). In the case of bounce messages for non-SMTP mesages, there was
      also a typo: it was using "Auto_submitted" (underscore instead of
      hyphen). Since every message generated by Exim is necessarily in response
      to another message, thes have all been changed to:

        Auto-Submitted: auto-replied

      in accordance with these statements in the RFC:

        The auto-replied keyword:

        -  SHOULD be used on messages sent in direct response to another
           message by an automatic process,

        -  MUST NOT be used on manually-generated messages,

        -  MAY be used on Delivery Status Notifications (DSNs) and Message
           Disposition Notifications (MDNs),

        -  MUST NOT be used on messages generated by automatic or periodic
           processes, except for messages which are automatic responses to
           other messages.

PH/11 Added "${if def:sender_address {(envelope-from <$sender_address>)\n\t}}"
      to the default Received: header definition.

PH/12 Added log selector acl_warn_skipped (default on).

PH/13 After a successful wildlsearch lookup, discard the values of numeric
      variables because (a) they are in the wrong storage pool and (b) even if
      they were copied, it wouldn't work properly because of the caching.

PH/14 Add check_rfc2047_length to disable enforcement of RFC 2047 length
      checking when decoding. Apparently there are clients that generate
      overlong encoded strings. Why am I not surprised?

PH/15 If the first argument of "${if match_address" was not empty, but did not
      contain an "@" character, Exim crashed. Now it writes a panic log message
      and treats the condition as false.

PH/16 In autoreply, treat an empty string for "once" the same as unset.

PH/17 A further patch from the Sieve maintainer: "Introduce the new Sieve
      extension "envelope-auth".  The code is finished and in agreement with
      other implementations, but there is no documentation so far and in fact,
      nobody wrote the draft yet.  This extension is currently #undef'ed, thus
      not changing the active code.

      Print executed "if" and "elsif" statements when debugging is used. This
      helps a great deal to understand what a filter does.

      Document more things not specified clearly in RFC3028.  I had all this
      sorted out, when out of a sudden new issues came to my mind.  Oops."

PH/18 Exim was not recognizing the "net-" search type prefix in match_ip lists
      (Bugzilla #53).

PH/19 Exim expands the IPv6 address given to -bh to its full non-abbreviated
      canonical form (as documented). However, after a host name lookup from
      the IP address, check_host() was doing a simple string comparison with
      addresses acquired from the DNS when checking that the found name did
      have the original IP as one of its addresses. Since any found IPv6
      addresses are likely to be in abbreviated form, the comparison could
      fail. Luckily, there already exists a function for doing the comparison
      by converting both addresses to binary, so now that is used instead of
      the text comparison.

PH/20 There was another similar case to PH/19, when a complete host name was
      given in a host list; looking up its IP address could give an abbreviated
      form, whereas the current host's name might or might not be abbreviated.
      The same fix has been applied.


Exim version 4.54
-----------------

PH/01 The ${base62: operator adjusted itself to base 36 when BASE_62 was
      set to 36 (for Darwin and Cygwin), but the ${base62d: operator did not.
      It now does.

PH/02 Two minor problems detected in Cygwin: the os.{c,h} files had lost */ on
      the CVS lines, and there was a missing #if HAVE_IPV6 in host.c.

PH/03 Typo: missing ".o" in src/pcre/Makefile.

PH/04 Tighten up "personal" tests: Instead of testing for any "List-"
      header line, restrict the check to what is listed in RFCs 2369 and 2929.
      Also, for "Auto-Submitted", treat anything other than "no" as
      non-personal, in accordance with RFC 3834. (Previously it treated
      anything starting "auto-" as non-personal.)

TF/01 The control=submission/name=... option had a problem with syntax
      errors if the name included a slash character. The /name= option
      now slurps the rest of the string, so it can include any characters
      but it must come last in the list of options (after /sender_retain
      or /domain=).

PH/05 Some modifications to the interface to the fake nameserver for the new
      testing suite.


Exim version 4.53
-----------------

TK/01 Added the "success_on_redirect" address verification option. See
      NewStuff for rationale and an example.

PH/01 Added support for SQLite, basic code supplied by David Woodhouse.

PH/02 Patch to exigrep to allow it to work on syslog lines.

PH/03 When creating an mbox file for a virus/spam scan, use fseek() instead of
      fread() to skip over the body file's header line, because in Cygwin the
      header line is locked and is inaccessible.

PH/04 Added $message_exim_id, ultimately to replace $message_id (they will both
      co-exist for some time) to make it clear that it is the Exim ID that is
      referenced, not the Message-ID: header line.

PH/05 Replaced all Tom's calls to snprintf() with calls to the internal
      string_format() function, because snprintf() does not exist on all
      operating systems.

PH/06 The use of forbid_filter_existstest now also locks out the use of the
      ${stat: expansion item.

PH/07 Changed "SMTP protocol violation: synchronization error" into "SMTP
      protocol synchronization error", to keep the pedants happy.

PH/08 Arrange for USE_INET_NTOA_FIX to be set in config.h for AIX systems as
      well as for IRIX systems, when gcc is being used. See the host.c source
      file for comments.

PH/09 Installed latest Cygwin configuration files from the Cygwin maintainer.

PH/10 Named domain lists were not working if used in a queue_smtp_domains
      setting.

PH/11 Added support for the IGNOREQUOTA extension to LMTP, both to the lmtp
      transport and to the smtp transport in LMTP mode.

TK/02 Remove one case of BASE64 error detection FTTB (undocumented anyway).

PH/12 There was a missing call to search_tidyup() before the fork() in rda.c to
      run a filter in a subprocess. This could lead to confusion in subsequent
      lookups in the parent process. There should also be a search_tidyup() at
      the end of the subprocess.

PH/13 Previously, if "verify = helo" was set in an ACL, the condition was true
      only if the host matched helo_try_verify_hosts, which caused the
      verification to occur when the EHLO/HELO command was issued. The ACL just
      tested the remembered result. Now, if a previous verification attempt has
      not happened, "verify = helo" does it there and then.

JJ/01 exipick: added $message_exim_id variable (see 4.53-PH/04)

TK/03 Fix log output including CR from clamd.

PH/14 A reference to $reply_address when Reply-to: was empty and From: did not
      exist provoked a memory error which could cause a segfault.

PH/15 Installed PCRE 6.2

PH/17 Defined BIND_8_COMPAT in the Darwin os.h file.

PH/18 Reversed 4.52/PH/17 because the HP-UX user found it wasn't the cause
      of the problem. Specifically, suggested +O2 rather than +O1 for the
      HP-UX compiler.

PH/19 Added sqlite_lock_timeout option (David Woodhouse's patch).

PH/20 If a delivery was routed to a non-standard port by means of an SRV
      record, the port was not correctly logged when the outgoing_port log
      selector was set (it logged the transort's default port).

PH/21 Added support for host-specific ports to manualroute, queryprogram,
      fallback_hosts, and "hosts" in the smtp transport.

PH/22 If the log selector "outgoing_port" is set, the port is now also given on
      host errors such as "Connection refused".

PH/23 Applied a patch to fix problems with exim-4.52 while doing radius
      authentication with radiusclient 0.4.9:

      - Error returned from rc_read_config was caught wrongly
      - Username/password not passed on to radius server due to wrong length.

      The presumption is that some radiusclient API changes for 4.51/PH/17
      were not taken care of correctly. The code is still untested by me (my
      Linux distribution still has 0.3.2 of radiusclient), but it was
      contributed by a Radius user.

PH/24 When doing a callout, the value of $domain wasn't set correctly when
      expanding the "port" option of the smtp transport.

TK/04 MIME ACL: Fix buffer underrun that occurs when EOF condition is met
      while reading a MIME header. Thanks to Tom Hughes for a patch.

PH/24 Include config.h inside local_scan.h so that configuration settings are
      available.

PH/25 Make $smtp_command_argument available after all SMTP commands. This means
      that in an ACL for RCPT (for example), you can examine exactly what was
      received.

PH/26 Exim was recognizing IPv6 addresses of the form [IPv6:....] in EHLO
      commands, but it was not correctly comparing the address with the actual
      client host address. Thus, it would show the EHLO address in Received:
      header lines when this was not necessary.

PH/27 Added the % operator to ${eval:}.

PH/28 Exim tries to create and chdir to its spool directory when it starts;
      it should be ignoring failures (because with -C, for example, it has lost
      privilege). It wasn't ignoring creation failures other than "already
      exists".

PH/29 Added "crypteq" to the list of supported features that Exim outputs when
      -bV or -d is used.

PH/30 Fixed (presumably very longstanding) bug in exim_dbmbuild: if it failed
      because an input line was too long, either on its own, or by virtue of
      too many continuations, the temporary file was not being removed, and the
      return code was incorrect.

PH/31 Missing "BOOL" in function definition in filtertest.c.

PH/32 Applied Sieve patches from the maintainer.

TK/05 Domainkeys: Accomodate for a minor API change in libdomainkeys 0.67.

PH/33 Added "verify = not_blind".

PH/34 There are settings for CHOWN_COMMAND and MV_COMMAND that can be used in
      Local/Makefile (with some defaults set). These are used in built scripts
      such as exicyclog, but they have never been used in the exim_install
      script (though there are many overriding facilities there). I have
      arranged that the exim_install script now takes note of these two
      settings.

PH/35 Installed configuration files for Dragonfly.

PH/36 When a locally submitted message by a trusted user did not contain a
      From: header, and the sender address was obtained from -f or from an SMTP
      MAIL command, and the trusted user did not use -F to supply a sender
      name, $originator_name was incorrectly used when constructing a From:
      header. Furthermore, $originator_name was used for submission mode
      messages from external hosts without From: headers in a similar way,
      which is clearly wrong.

PH/37 Added control=suppress_local_fixups.

PH/38 When log_selector = +received_sender was set, and the addition of the
      sender made the log line's construction buffer exactly full, or one byte
      less than full, an overflow happened when the terminating "\n" was
      subsequently added.

PH/39 Added a new log selector, "unknown_in_list", which provokes a log entry
      when the result of a list match is failure because a DNS lookup failed.

PH/40 RM_COMMAND is now used in the building process.

PH/41 Added a "distclean" target to the top-level Makefile; it deletes all
      the "build-* directories that it finds.

PH/42 (But a TF fix): In a domain list, Exim incorrectly matched @[] if the IP
      address in a domain literal was a prefix of an interface address.

PH/43 (Again a TF fix): In the dnslookup router, do not apply widen_domains
      when verifying a sender address, unless rewrite_headers is false.

PH/44 Wrote a long comment about why errors_to addresses are verified as
      recipients, not senders.

TF/01 Add missing LIBS=-lm to OS/Makefile-OpenBSD which was overlooked when
      the ratelimit ACL was added.

PH/45 Added $smtp_command for the full command (cf $smtp_command_argument).

PH/46 Added extra information about PostgreSQL errors to the error string.

PH/47 Added an interface to a fake DNS resolver for use by the new test suite,
      avoiding the need to install special zones in a real server. This is
      backwards compatible; if it can't find the fake resolver, it drops back.
      Thus, both old and new test suites can be run.

TF/02 Added util/ratelimit.pl

TF/03 Minor fix to the ratelimit code to improve its behaviour in case the
      clock is set back in time.

TF/04 Fix the ratelimit support in exim_fixdb. Patch provided by Brian
      Candler <B.Candler@pobox.com>.

TF/05 The fix for PH/43 was not completely correct; widen_domains is always
      OK for addresses that are the result of redirections.

PH/48 A number of further additions for the benefit of the new test suite,
      including a fake gethostbyname() that interfaces to the fake DNS resolver
      (see PH/47 above).

TF/06 The fix for widen_domains has also been applied to qualify_single and
      search_parents which are the other dnslookup options that can cause
      header rewrites.

PH/49 Michael Haardt's randomized retrying, but as a separate retry parameter
      type ("H").

PH/50 Make never_users, trusted_users, admin_groups, trusted_groups expandable.

TF/07 Exim produced the error message "an SRV record indicated no SMTP
      service" if it encountered an MX record with an empty target hostname.
      The message is now "an MX or SRV record indicated no SMTP service".

TF/08 Change PH/13 introduced the possibility that verify=helo may defer,
      if the DNS of the sending site is misconfigured. This is quite a
      common situation. This change restores the behaviour of treating a
      helo verification defer as a failure.

PH/51 If self=fail was set on a router, the bounce message did not include the
      actual error message.


Exim version 4.52
-----------------

TF/01 Added support for Client SMTP Authorization. See NewStuff for details.

PH/01 When a transport filter timed out in a pipe delivery, and the pipe
      command itself ended in error, the underlying message about the transport
      filter timeout was being overwritten with the pipe command error. Now the
      underlying error message should be appended to the second error message.

TK/01 Fix poll() being unavailable on Mac OSX 10.2.

PH/02 Reduce the amount of output that "make" produces by default. Full output
      can still be requested.

PH/03 The warning log line about a condition test deferring for a "warn" verb
      was being output only once per connection, rather than after each
      occurrence (because it was using the same function as for successful
      "warn" verbs). This seems wrong, so I have changed it.

TF/02 Two buglets in acl.c which caused Exim to read a few bytes of memory that
      it should not have, which might have caused a crash in the right
      circumstances, but probably never did.

PH/04 Installed a modified version of Tony Finch's patch to make submission
      mode fix the return path as well as the Sender: header line, and to
      add a /name= option so that you can make the user's friendly name appear
      in the header line.

TF/03 Added the control = fakedefer ACL modifier.

TF/04 Added the ratelimit ACL condition. See NewStuff for details. Thanks to
      Mark Lowes for thorough testing.

TK/02 Rewrote SPF support to work with libspf2 versions >1.2.0.

TK/03 Merged latest SRS patch from Miles Wilton.

PH/05 There's a shambles in IRIX6 - it defines EX_OK in unistd.h which conflicts
      with the definition in sysexits.h (which is #included earlier).
      Fortunately, Exim does not actually use EX_OK. The code used to try to
      preserve the sysexits.h value, by assumimg that macro definitions were
      scanned for macro replacements. I have been disabused of this notion,
      so now the code just undefines EX_OK before #including unistd.h.

PH/06 There is a timeout for writing blocks of data, set by, e.g. data_timeout
      in the smtp transport. When a block could not be written in a single
      write() function, the timeout was being re-applied to each part-write.
      This seems wrong - if the receiver was accepting one byte at a time it
      would take for ever. The timeout is now adjusted when this happens. It
      doesn't have to be particularly precise.

TK/04 Added simple SPF lookup method in EXPERIMENTAL_SPF. See NewStuff for
      details. Thanks to Chris Webb <chris@arachsys.com> for the patch!

PH/07 Added "fullpostmaster" verify option, which does a check to <postmaster>
      without a domain if the check to <postmaster@domain> fails.

SC/01 Eximstats: added -xls and the ability to specify output files
     (patch written by Frank Heydlauf).

SC/02 Eximstats: use FileHandles for outputing results.

SC/03 Eximstats: allow any combination of xls, txt, and html output.

SC/04 Eximstats: fixed display of large numbers with -nvr option

SC/05 Eximstats: fixed merging of reports with empty tables.

SC/06 Eximstats: added the -include_original_destination flag

SC/07 Eximstats: removed tabs and trailing whitespace.

TK/05 Malware: Improve on aveserver error handling. Patch from Alex Miller.

TK/06 MBOX spool code: Add real "From " MBOX separator line
      so the .eml file is really in mbox format (even though
      most programs do not really care). Patch from Alex Miller.

TK/07 MBOX spool code: Add X-Envelope-From: and X-Envelope-To: headers.
      The latter is generated from $received_to and is only set if the
      message has one envelope recipient. SA can use these headers,
      obviously out-of-the-box. Patch from Alex Miller.

PH/08 The ${def test on a variable was returning false if the variable's
      value was "0", contrary to what the specification has always said!
      The result should be true unless the variable is empty.

PH/09 The syntax error of a character other than { following "${if
      def:variable_name" (after optional whitespace) was not being diagnosed.
      An expansion such as ${if def:sender_ident:{xxx}{yyy}} in which an
      accidental colon was present, for example, could give incorrect results.

PH/10 Tidied the code in a number of places where the st_size field of a stat()
      result is used (not including appendfile, where other changes are about
      to be made).

PH/11 Upgraded appendfile so that quotas larger than 2G are now supported.
      This involved changing a lot of size variables from int to off_t. It
      should work with maildirs and everything.

TK/08 Apply fix provided by Michael Haardt to prevent deadlock in case of
      spamd dying while we are connected to it.

TF/05 Fixed a ${extract error message typo reported by Jeremy Harris
      <jgh@wizmail.org>

PH/12 Applied Alex Kiernan's patch for the API change for the error callback
      function for BDB 4.3.

PH/13 Changed auto_thaw such that it does not apply to bounce messages.

PH/14 Imported PCRE 6.0; this was more than just a trivial operation because
      the sources for PCRE have been re-arranged and more files are now
      involved.

PH/15 The code I had for printing potentially long long variables in PH/11
      above was not the best (it lost precision). The length of off_t variables
      is now inspected at build time, and an appropriate printing format (%ld
      or %lld) is chosen and #defined by OFF_T_FMT. We also define LONGLONG_T
      to be "long long int" or "long int". This is needed for the internal
      formatting function string_vformat().

PH/16 Applied Matthew Newton's patch to exicyclog: "If log_file_path is set in
      the configuration file to be ":syslog", then the script "guesses" where
      the logs files are, rather than using the compiled in default. In our
      case the guess is not the same as the compiled default, so the script
      suddenly stopped working when I started to use syslog. The patch checks
      to see if log_file_path is "". If so, it attempts to read it from exim
      with no configuration file to get the compiled in version, before it
      falls back to the previous guessing code."

TK/09 Added "prvs" and "prvscheck" expansion items. These help a lot with
      implementing BATV in an Exim configuration. See NewStuff for the gory
      details.

PH/17 Applied Michael Haardt's patch for HP-UX, affecting only the os.h and
      Makefile that are specific to HP-UX.

PH/18 If the "use_postmaster" option was set for a recipient callout together
      with the "random" option, the postmaster address was used as the MAIL
      FROM address for the random test, but not for the subsequent recipient
      test. It is now used for both.

PH/19 Applied Michael Haardt's patch to update Sieve to RFC3028bis. "The
      patch removes a few documentation additions to RFC 3028, because the
      latest draft now contains them. It adds the new en;ascii-case comparator
      and a new error check for 8bit text in MIME parts. Comparator and
      require names are now matched exactly. I enabled the subaddress
      extension, but it is not well tested yet (read: it works for me)."

PH/20 Added macros for time_t as for off_t (see PH/15 above) and used them to
      rework some of the code of TK/09 above to avoid the hardwired use of
      "%lld" and "long long". Replaced the call to snprintf() with a call to
      string_vformat().

PH/21 Added some other messages to those in 4.51/PH/42, namely "All relevant MX
      records point to non-existent hosts", "retry timeout exceeded", and
      "retry time not reached for any host after a long failure period".

PH/22 Fixed some oversights/typos causing bugs when Exim is compiled with
      experimental DomainKeys support:

      (1) The filter variables $n0-$n9 and $sn0-$sn9 were broken.
      (2) On an error such as an illegally used "control", the wrong name for
          the control was given.

      These problems did NOT occur unless DomainKeys support was compiled.

PH/23 Added daemon_startup_retries and daemon_startup_sleep.

PH/24 Added ${if match_ip condition.

PH/25 Put debug statements on either side of calls to EXIM_DBOPEN() for hints
      databases so that it will be absolutely obvious if a crash occurs in the
      DB library. This is a regular occurrence (often caused by mis-matched
      db.h files).

PH/26 Insert a lot of missing (void) casts for functions such as chown(),
      chmod(), fcntl(), sscanf(), and other functions from stdio.h. These were
      picked up on a user's system that detects such things. There doesn't seem
      to be a gcc warning option for this - only an attribute that has to be
      put on the function's prototype. It seems that in Fedora Core 4 they have
      set this on a number of new functions. No doubt there will be more in due
      course.

PH/27 If a dnslookup or manualroute router is set with verify=only, it need not
      specify a transport. However, if an address that was verified by such a
      router was the subject of a callout, Exim crashed because it tried to
      read the rcpt_include_affixes from the non-existent transport. Now it
      just assumes that the setting of that option is false. This bug was
      introduced by 4.51/PH/31.

PH/28 Changed -d+all to exclude +memory, because that information is very
      rarely of interest, but it makes the output a lot bigger. People tend to
      do -d+all out of habit.

PH/29 Removed support for the Linux-libc5 build, as it is obsolete and the
      code in os-type was giving problems when libc.so lives in lib64, like on
      x86_64 Fedora Core.

PH/30 Exim's DNS code uses the original T_xxx names for DNS record times. These
      aren't the modern standard, and it seems that some systems' include files
      don't always have them. Exim was already checking for some of the newer
      ones like T_AAAA, and defining it itself. I've added checks for all the
      record types that Exim uses.

PH/31 When using GnuTLS, if the parameters cache file did not exist, Exim was
      not automatically generating a new one, as it is supposed to. This
      prevented TLS from working. If the file did exist, but contained invalid
      data, a new version was generated, as expected. It was only the case of a
      non-existent file that was broken.

TK/10 Domainkeys: Fix a bug in verification that caused a crash in conjunction
      with a change in libdomainkeys > 0.64.

TK/11 Domainkeys: Change the logic how the "testing" policy flag is retrieved
      from DNS. If the selector record carries the flag, it now has
      precedence over the domain-wide flag.

TK/12 Cleared some compiler warnings related to SPF, SRS and DK code.

PH/32 In mua_wrapper mode, if an smtp transport configuration error (such as
      the use of a port name that isn't defined in /etc/services) occurred, the
      message was deferred as in a normal delivery, and thus remained on the
      spool, instead of being failed because of the mua_wrapper setting. This
      is now fixed, and I tidied up some of the mua_wrapper messages at the
      same time.

SC/08 Eximstats: whilst parsing the mainlog(s), store information about
      the messages in a hash of arrays rather than using individual hashes.
      This is a bit cleaner and results in dramatic memory savings, albeit
      at a slight CPU cost.

SC/09 Eximstats: added the -show_rt<list> and the -show_dt<list> flags
      as requested by Marc Sherman.

SC/10 Eximstats: added histograms for user specified patterns as requested
      by Marc Sherman.

SC/11 Eximstats: v1.43 - bugfix for pattern histograms with -h0 specified.

PH/33 Patch from the Cygwin maintainer to add "b" to all occurences of
      fopen() in the content-scanning modules that did not already have it.


Exim version 4.51
-----------------

TK/01 Added Yahoo DomainKeys support via libdomainkeys. See
      doc/experimental-spec.txt for details. (http://domainkeys.sf.net)

TK/02 Fix ACL "control" statement not being available in MIME ACL.

TK/03 Fix ACL "regex" condition not being available in MIME ACL.

PH/01 Installed a patch from the Sieve maintainer that allows -bf to be used
      to test Sieve filters that use "vacation".

PH/02 Installed a slightly modified version of Nikos Mavrogiannopoulos' patch
      that changes the way the GnuTLS parameters are stored in the cache file.
      The new format can be generated externally. For backward compatibility,
      if the data in the cache doesn't make sense, Exim assumes it has read an
      old-format file, and it generates new data and writes a new file. This
      means that you can't go back to an older release without removing the
      file.

PH/03 A redirect router that has both "unseen" and "one_time" set does not
      work if there are any delivery delays because "one_time" forces the
      parent to be marked "delivered", so its unseen clone is never tried
      again. For this reason, Exim now forbids the simultaneous setting of
      these two options.

PH/04 Change 4.11/85 fixed an obscure bug concerned with addresses that are
      redirected to themselves ("homonym" addresses). Read the long ChangeLog
      entry if you want to know the details. The fix, however, neglected to
      consider the case when local delivery batching is involved. The test for
      "previously delivered" was not happening when checking to see if an
      address could be batched with a previous (undelivered) one; under
      certain circumstances this could lead to multiple deliveries to the same
      address.

PH/05 Renamed the macro SOCKLEN_T as EXIM_SOCKLEN_T because AIX uses SOCKLEN_T
      in its include files, and this causes problems building Exim.

PH/06 A number of "verify =" ACL conditions have no options (e.g. verify =
      header_syntax) but Exim was just ignoring anything given after a slash.
      In particular, this caused confusion with an attempt to use "verify =
      reverse_host_lookup/defer_ok". An error is now given when options are
      supplied for verify items that do not have them. (Maybe reverse_host_
      lookup should have a defer_ok option, but that's a different point.)

PH/07 Increase the size of the buffer for incoming SMTP commands from 512 (as
      defined by RFC 821) to 2048, because there were problems with some AUTH
      commands, and RFC 1869 says the size should be increased for extended
      SMTP commands that take arguments.

PH/08 Added ${dlfunc dynamically loaded function for expansion (code from Tony
      Finch).

PH/09 Previously, an attempt to use ${perl when it wasn't compiled gave an
      "unknown" error; now it says that the functionality isn't in the binary.

PH/10 Added a nasty fudge to try to recognize and flatten LDAP passwords in
      an address' error message when a string expansion fails (syntax or
      whatever). Otherwise the password may appear in the log. Following change
      PH/42 below, there is no longer a chance of it appearing in a bounce
      message.

PH/11 Installed exipick version 20050225.0 from John Jetmore.

PH/12 If the last host in a fallback_hosts list was multihomed, only the first
      of its addresses was ever tried. (Bugzilla bug #2.)

PH/13 If "headers_add" in a transport didn't end in a newline, Exim printed
      the result incorrectly in the debug output. (It correctly added a newline
      to what was transported.)

TF/01 Added $received_time.

PH/14 Modified the default configuration to add an acl_smtp_data ACL, with
      commented out examples of how to interface to a virus scanner and to
      SpamAssassin. Also added commented examples of av_scanner and
      spamd_address settings.

PH/15 Further to TK/02 and TK/03 above, tidied up the tables of what conditions
      and controls are allowed in which ACLs. There were a couple of minor
      errors. Some of the entries in the conditions table (which is a table of
      where they are NOT allowed) were getting very unwieldy; rewrote them as a
      negation of where the condition IS allowed.

PH/16 Installed updated OS/os.c-cygwin from the Cygwin maintainer.

PH/17 The API for radiusclient changed at release 0.4.0. Unfortunately, the
      header file does not have a version number, so I've had to invent a new
      value for RADIUS_LIB_TYPE, namely "RADIUSCLIENTNEW" to request the new
      API. The code is untested by me (my Linux distribution still has 0.3.2 of
      radiusclient), but it was contributed by a Radius user.

PH/18 Installed Lars Mainka's patch for the support of CRL collections in
      files or directories, for OpenSSL.

PH/19 When an Exim process that is running as root has to create an Exim log
      file, it does so in a subprocess that runs as exim:exim so as to get the
      ownership right at creation (otherwise, other Exim processes might see
      the file with the wrong ownership). There was no test for failure of this
      fork() call, which would lead to the process getting stuck as it waited
      for a non-existent subprocess. Forks do occasionally fail when resources
      run out. I reviewed all the other calls to fork(); they all seem to check
      for failure.

PH/20 When checking for unexpected SMTP input at connect time (before writing
      the banner), Exim was not dealing correctly with a non-positive return
      from the read() function. If the client had disconnected by this time,
      the result was a log entry for a synchronization error with an empty
      string after "input=" when read() returned zero. If read() returned -1
      (an event I could not check), uninitialized data bytes were printed.
      There were reports of junk text (parts of files, etc) appearing after
      "input=".

PH/21 Added acl_not_smtp_mime to allow for MIME scanning for non-SMTP messages.

PH/22 Added support for macro redefinition, and (re)definition in between
      driver and ACL definitions.

PH/23 The cyrus_sasl authenticator was expanding server_hostname, but then
      forgetting to use the resulting value; it was using the unexpanded value.

PH/24 The cyrus_sasl authenticator was advertising mechanisms for which it
      hadn't been configured. The fix is from Juergen Kreileder, who
      understands it better than I do:

      "Here's what I see happening with three configured cyrus_sasl
      authenticators configured (plain, login, cram-md5):

      On startup auth_cyrus_sasl_init() gets called for each of these.
      This means three calls to sasl_listmech() without a specified mech_list.
      => SASL tests which mechs of all available mechs actually work
      => three warnings about OTP not working
      => the returned list contains: plain, login, cram-md5, digest-md5, ...

      With the patch, sasl_listmech() also gets called three times.  But now
      SASL's mech_list option is set to the server_mech specified in the the
      authenticator.  Or in other words, the answer from sasl_listmech()
      gets limited to just the mech you're testing for (which is different
      for each call.)
      => the return list contains just 'plain' or 'login', 'cram-md5' or
      nothing depending on the value of ob->server_mech.

      I've just tested the patch: Authentication still works fine,
      unavailable mechs specified in the exim configuration are still
      caught, and the auth.log warnings about OTP are gone."

PH/25 When debugging is enabled, the contents of the command line are added
      to the debugging output, even when log_selector=+arguments is not
      specified.

PH/26 Change scripts/os-type so that when "uname -s" returns just "GNU", the
      answer is "GNU", and only if the return is "GNU/something" is the answer
      "Linux".

PH/27 $acl_verify_message is now set immediately after the failure of a
      verification in an ACL, and so is available in subsequent modifiers. In
      particular, the message can be preserved by coding like this:

         warn  !verify = sender
               set acl_m0 = $acl_verify_message

      Previously, $acl_verify_message was set only while expanding "message"
      and "log_message" when a very denied access.

PH/28 Modified OS/os.c-Linux with

        -#ifndef OS_LOAD_AVERAGE
        +#if !defined(OS_LOAD_AVERAGE) && defined(__linux__)

      to make Exim compile on kfreebsd-gnu. (I'm totally confused about the
      nomenclature these days.)

PH/29 Installed patch from the Sieve maintainer that adds the options
      sieve_useraddress and sieve_subaddress to the redirect router.

PH/30 In these circumstances:
        . Two addresses routed to the same list of hosts;
        . First host does not offer TLS;
        . First host accepts first address;
        . First host gives temporary error to second address;
        . Second host offers TLS and a TLS session is established;
        . Second host accepts second address.
      Exim incorrectly logged both deliveries with the TLS parameters (cipher
      and peerdn, if requested) that were in fact used only for the second
      address.

PH/31 When doing a callout as part of verifying an address, Exim was not paying
      attention to any local part prefix or suffix that was matched by the
      router that accepted the address. It now behaves in the same way as it
      does for delivery: the affixes are removed from the local part unless