4 This file contains descriptions of new features that have been added to Exim.
5 Before a formal release, there may be quite a lot of detail so that people can
6 test from the snapshots or the CVS before the documentation is updated. Once
7 the documentation is updated, this file is reduced to a short list.
12 1. New command-line option -bI:sieve will list all supported sieve extensions
13 of this Exim build on standard output, one per line.
14 ManageSieve (RFC 5804) providers managing scripts for use by Exim should
15 query this to establish the correct list to include in the protocol's
16 SIEVE capability line.
18 2. If the -n option is combined with the -bP option, then the name of an
19 emitted option is not output, only the value (if visible to you).
20 For instance, "exim -n -bP pid_file_path" should just emit a pathname
21 followed by a newline, and no other text.
23 3. When built with SUPPORT_TLS and USE_GNUTLS, the SMTP transport driver now
24 has a "tls_dh_min_bits" option, to set the minimum acceptable number of
25 bits in the Diffie-Hellman prime offered by a server (in DH ciphersuites)
26 acceptable for security. (Option accepted but ignored if using OpenSSL).
27 Defaults to 1024, the old value. May be lowered only to 512, or raised as
28 far as you like. Raising this may hinder TLS interoperability with other
29 sites and is not currently recommended. Lowering this will permit you to
30 establish a TLS session which is not as secure as you might like.
32 Unless you really know what you are doing, leave it alone.
34 4. If not built with DISABLE_DNSSEC, Exim now has the main option
35 dns_dnssec_ok; if set to 1 then Exim will initialise the resolver library
36 to send the DO flag to your recursive resolver. If you have a recursive
37 resolver, which can set the Authenticated Data (AD) flag in results, Exim
38 can now detect this. Exim does not perform validation itself, instead
39 relying upon a trusted path to the resolver.
41 Current status: work-in-progress; $sender_host_dnssec variable added.
43 5. DSCP support for outbound connections: on a transport using the smtp driver,
44 set "dscp = ef", for instance, to cause the connections to have the relevant
45 DSCP (IPv4 TOS or IPv6 TCLASS) value in the header.
47 Similarly for inbound connections, there is a new control modifier, dscp,
48 so "warn control = dscp/ef" in the connect ACL, or after authentication.
50 Supported values depend upon system libraries. "exim -bI:dscp" to list the
51 ones Exim knows of. You can also set a raw number 0..0x3F.
53 6. The -G command-line flag is no longer ignored; it is now equivalent to an
54 ACL setting "control = suppress_local_fixups". The -L command-line flag
55 is now accepted and forces use of syslog, with the provided tag as the
56 process name. A few other flags used by Sendmail are now accepted and
59 7. New cutthrough routing feature. Requested by a "control = cutthrough_delivery"
60 ACL modifier; works for single-recipient mails which are recieved on and
61 deliverable via SMTP. Using the connection made for a recipient verify,
62 if requested before the verify, or a new one made for the purpose while
63 the inbound connection is still active. The bulk of the mail item is copied
64 direct from the inbound socket to the outbound (as well as the spool file).
65 When the source notifies the end of data, the data acceptance by the destination
66 is negociated before the acceptance is sent to the source. If the destination
67 does not accept the mail item, for example due to content-scanning, the item
68 is not accepted from the source and therefore there is no need to generate
69 a bounce mail. This is of benefit when providing a secondary-MX service.
70 The downside is that delays are under the control of the ultimate destination
73 The Recieved-by: header on items delivered by cutthrough is generated
74 early in reception rather than at the end; this will affect any timestamp
75 included. The log line showing delivery is recorded before that showing
76 reception; it uses a new ">>" tag instead of "=>".
78 To support the feature, verify-callout connections can now use ESMTP and TLS.
79 The usual smtp transport options are honoured, plus a (new, default everything)
80 hosts_verify_avoid_tls.
82 New variable families named tls_in_cipher, tls_out_cipher etc. are introduced
83 for specific access to the information for each connection. The old names
84 are present for now but deprecated.
86 Not yet supported: IGNOREQUOTA, SIZE, PIPELINING.
88 8. New expansion operators ${listnamed:name} to get the content of a named list
89 and ${listcount:string} to count the items in a list.
91 9. New global option "gnutls_enable_pkcs11", defaults false. The GnuTLS
92 rewrite in 4.80 combines with GnuTLS 2.12.0 or later, to autoload PKCS11
93 modules. For some situations this is desirable, but we expect admin in
94 those situations to know they want the feature. More commonly, it means
95 that GUI user modules get loaded and are broken by the setuid Exim being
96 unable to access files specified in environment variables and passed
97 through, thus breakage. So we explicitly inhibit the PKCS11 initialisation
98 unless this new option is set.
100 10. The "acl = name" condition on an ACL now supports optional arguments.
101 New expansion item "${acl {name}{arg}...}" and expansion condition
102 "acl {{name}{arg}...}" are added. In all cases up to nine arguments
103 can be used, appearing in $acl_arg1 to $acl_arg9 for the called ACL.
104 Variable $acl_narg contains the number of arguments. If the ACL sets
105 a "message =" value this becomes the result of the expansion item,
106 or the value of $value for the expansion condition. If the ACL returns
107 accept the expansion condition is true; if reject, false. A defer
108 return results in a forced fail.
110 11. Routers and transports can now have multiple headers_add and headers_remove
111 option lines. The concatenated list is used.
113 12. New ACL modifier "remove_header" can remove headers before message gets
114 handled by routers/transports.
116 13. New dnsdb lookup pseudo-type "a+". A sequence of "a6" (if configured),
117 "aaaa" and "a" lookups is done and the full set of results returned.
119 14. New expansion variable $headers_added with content from ACL add_header
120 modifier (but not yet added to messsage).
122 15. New 8bitmime status logging option for received messages. Log field "M8S".
124 16. New authenticated_sender logging option, adding to log field "A".
126 17. New expansion variables $router_name and $transport_name. Useful
127 particularly for debug_print as -bt commandline option does not
128 require privilege whereas -d does.
130 18. If built with EXPERIMENTAL_PRDR, per-recipient data responses per a
131 proposed extension to SMTP from Eric Hall.
133 19. The pipe transport has gained the force_command option, to allow
134 decorating commands from user .forward pipe aliases with prefix
135 wrappers, for instance.
137 20. Callout connections can now AUTH; the same controls as normal delivery
140 21. Support for DMARC, using opendmarc libs, can be enabled. It adds new
141 options: dmarc_forensic_sender, dmarc_history_file, and dmarc_tld_file.
142 It adds new expansion variables $dmarc_ar_header, $dmarc_status,
143 $dmarc_status_text, and $dmarc_used_domain. It adds a new acl modifier
144 dmarc_status. It adds new control flags dmarc_disable_verify and
145 dmarc_enable_forensic.
147 22. Add expansion variable $authenticated_fail_id, which is the username
148 provided to the authentication method which failed. It is available
149 for use in subsequent ACL processing (typically quit or notquit ACLs).
151 23. New ACL modifer "udpsend" can construct a UDP packet to send to a given
154 24. New ${hexquote:..string..} expansion operator converts non-printable
155 characters in the string to \xNN form.
161 1. New authenticator driver, "gsasl". Server-only (at present).
162 This is a SASL interface, licensed under GPL, which can be found at
163 http://www.gnu.org/software/gsasl/.
164 This system does not provide sources of data for authentication, so
165 careful use needs to be made of the conditions in Exim.
167 2. New authenticator driver, "heimdal_gssapi". Server-only.
168 A replacement for using cyrus_sasl with Heimdal, now that $KRB5_KTNAME
169 is no longer honoured for setuid programs by Heimdal. Use the
170 "server_keytab" option to point to the keytab.
172 3. The "pkg-config" system can now be used when building Exim to reference
173 cflags and library information for lookups and authenticators, rather
174 than having to update "CFLAGS", "AUTH_LIBS", "LOOKUP_INCLUDE" and
175 "LOOKUP_LIBS" directly. Similarly for handling the TLS library support
176 without adjusting "TLS_INCLUDE" and "TLS_LIBS".
178 In addition, setting PCRE_CONFIG=yes will query the pcre-config tool to
179 find the headers and libraries for PCRE.
181 4. New expansion variable $tls_bits.
183 5. New lookup type, "dbmjz". Key is an Exim list, the elements of which will
184 be joined together with ASCII NUL characters to construct the key to pass
185 into the DBM library. Can be used with gsasl to access sasldb2 files as
188 6. OpenSSL now supports TLS1.1 and TLS1.2 with OpenSSL 1.0.1.
190 Avoid release 1.0.1a if you can. Note that the default value of
191 "openssl_options" is no longer "+dont_insert_empty_fragments", as that
192 increased susceptibility to attack. This may still have interoperability
193 implications for very old clients (see version 4.31 change 37) but
194 administrators can choose to make the trade-off themselves and restore
195 compatibility at the cost of session security.
197 7. Use of the new expansion variable $tls_sni in the main configuration option
198 tls_certificate will cause Exim to re-expand the option, if the client
199 sends the TLS Server Name Indication extension, to permit choosing a
200 different certificate; tls_privatekey will also be re-expanded. You must
201 still set these options to expand to valid files when $tls_sni is not set.
203 The SMTP Transport has gained the option tls_sni, which will set a hostname
204 for outbound TLS sessions, and set $tls_sni too.
206 A new log_selector, +tls_sni, has been added, to log received SNI values
207 for Exim as a server.
209 8. The existing "accept_8bitmime" option now defaults to true. This means
210 that Exim is deliberately not strictly RFC compliant. We're following
211 Dan Bernstein's advice in http://cr.yp.to/smtp/8bitmime.html by default.
212 Those who disagree, or know that they are talking to mail servers that,
213 even today, are not 8-bit clean, need to turn off this option.
215 9. Exim can now be started with -bw (with an optional timeout, given as
216 -bw<timespec>). With this, stdin at startup is a socket that is
217 already listening for connections. This has a more modern name of
218 "socket activation", but forcing the activated socket to fd 0. We're
219 interested in adding more support for modern variants.
221 10. ${eval } now uses 64-bit values on supporting platforms. A new "G" suffix
222 for numbers indicates multiplication by 1024^3.
224 11. The GnuTLS support has been revamped; the three options gnutls_require_kx,
225 gnutls_require_mac & gnutls_require_protocols are no longer supported.
226 tls_require_ciphers is now parsed by gnutls_priority_init(3) as a priority
227 string, documentation for which is at:
228 http://www.gnutls.org/manual/html_node/Priority-Strings.html
230 SNI support has been added to Exim's GnuTLS integration too.
232 For sufficiently recent GnuTLS libraries, ${randint:..} will now use
233 gnutls_rnd(), asking for GNUTLS_RND_NONCE level randomness.
235 12. With OpenSSL, if built with EXPERIMENTAL_OCSP, a new option tls_ocsp_file
236 is now available. If the contents of the file are valid, then Exim will
237 send that back in response to a TLS status request; this is OCSP Stapling.
238 Exim will not maintain the contents of the file in any way: administrators
239 are responsible for ensuring that it is up-to-date.
241 See "experimental-spec.txt" for more details.
243 13. ${lookup dnsdb{ }} supports now SPF record types. They are handled
244 identically to TXT record lookups.
246 14. New expansion variable $tod_epoch_l for higher-precision time.
248 15. New global option tls_dh_max_bits, defaulting to current value of NSS
249 hard-coded limit of DH ephemeral bits, to fix interop problems caused by
250 GnuTLS 2.12 library recommending a bit count higher than NSS supports.
252 16. tls_dhparam now used by both OpenSSL and GnuTLS, can be path or identifier.
253 Option can now be a path or an identifier for a standard prime.
254 If unset, we use the DH prime from section 2.2 of RFC 5114, "ike23".
255 Set to "historic" to get the old GnuTLS behaviour of auto-generated DH
258 17. SSLv2 now disabled by default in OpenSSL. (Never supported by GnuTLS).
259 Use "openssl_options -no_sslv2" to re-enable support, if your OpenSSL
260 install was not built with OPENSSL_NO_SSL2 ("no-ssl2").
266 1. New options for the ratelimit ACL condition: /count= and /unique=.
267 The /noupdate option has been replaced by a /readonly option.
269 2. The SMTP transport's protocol option may now be set to "smtps", to
270 use SSL-on-connect outbound.
272 3. New variable $av_failed, set true if the AV scanner deferred; ie, when
273 there is a problem talking to the AV scanner, or the AV scanner running.
275 4. New expansion conditions, "inlist" and "inlisti", which take simple lists
276 and check if the search item is a member of the list. This does not
277 support named lists, but does subject the list part to string expansion.
279 5. Unless the new EXPAND_LISTMATCH_RHS build option is set when Exim was
280 built, Exim no longer performs string expansion on the second string of
281 the match_* expansion conditions: "match_address", "match_domain",
282 "match_ip" & "match_local_part". Named lists can still be used.
288 1. The global option "dns_use_edns0" may be set to coerce EDNS0 usage on
289 or off in the resolver library.
295 1. In addition to the existing LDAP and LDAP/SSL ("ldaps") support, there
296 is now LDAP/TLS support, given sufficiently modern OpenLDAP client
297 libraries. The following global options have been added in support of
298 this: ldap_ca_cert_dir, ldap_ca_cert_file, ldap_cert_file, ldap_cert_key,
299 ldap_cipher_suite, ldap_require_cert, ldap_start_tls.
301 2. The pipe transport now takes a boolean option, "freeze_signal", default
302 false. When true, if the external delivery command exits on a signal then
303 Exim will freeze the message in the queue, instead of generating a bounce.
305 3. Log filenames may now use %M as an escape, instead of %D (still available).
306 The %M pattern expands to yyyymm, providing month-level resolution.
308 4. The $message_linecount variable is now updated for the maildir_tag option,
309 in the same way as $message_size, to reflect the real number of lines,
310 including any header additions or removals from transport.
312 5. When contacting a pool of SpamAssassin servers configured in spamd_address,
313 Exim now selects entries randomly, to better scale in a cluster setup.
319 1. SECURITY FIX: privilege escalation flaw fixed. On Linux (and only Linux)
320 the flaw permitted the Exim run-time user to cause root to append to
321 arbitrary files of the attacker's choosing, with the content based
322 on content supplied by the attacker.
324 2. Exim now supports loading some lookup types at run-time, using your
325 platform's dlopen() functionality. This has limited platform support
326 and the intention is not to support every variant, it's limited to
327 dlopen(). This permits the main Exim binary to not be linked against
328 all the libraries needed for all the lookup types.
334 NOTE: this version is not guaranteed backwards-compatible, please read the
335 items below carefully
337 1. A new main configuration option, "openssl_options", is available if Exim
338 is built with SSL support provided by OpenSSL. The option allows
339 administrators to specify OpenSSL options to be used on connections;
340 typically this is to set bug compatibility features which the OpenSSL
341 developers have not enabled by default. There may be security
342 consequences for certain options, so these should not be changed
345 2. A new pipe transport option, "permit_coredumps", may help with problem
346 diagnosis in some scenarios. Note that Exim is typically installed as
347 a setuid binary, which on most OSes will inhibit coredumps by default,
348 so that safety mechanism would have to be overridden for this option to
349 be able to take effect.
351 3. ClamAV 0.95 is now required for ClamAV support in Exim, unless
352 Local/Makefile sets: WITH_OLD_CLAMAV_STREAM=yes
353 Note that this switches Exim to use a new API ("INSTREAM") and a future
354 release of ClamAV will remove support for the old API ("STREAM").
356 The av_scanner option, when set to "clamd", now takes an optional third
357 part, "local", which causes Exim to pass a filename to ClamAV instead of
358 the file content. This is the same behaviour as when clamd is pointed at
359 a Unix-domain socket. For example:
361 av_scanner = clamd:192.0.2.3 1234:local
363 ClamAV's ExtendedDetectionInfo response format is now handled.
365 4. There is now a -bmalware option, restricted to admin users. This option
366 takes one parameter, a filename, and scans that file with Exim's
367 malware-scanning framework. This is intended purely as a debugging aid
368 to ensure that Exim's scanning is working, not to replace other tools.
369 Note that the ACL framework is not invoked, so if av_scanner references
370 ACL variables without a fallback then this will fail.
372 5. There is a new expansion operator, "reverse_ip", which will reverse IP
373 addresses; IPv4 into dotted quad, IPv6 into dotted nibble. Examples:
375 ${reverse_ip:192.0.2.4}
377 ${reverse_ip:2001:0db8:c42:9:1:abcd:192.0.2.3}
378 -> 3.0.2.0.0.0.0.c.d.c.b.a.1.0.0.0.9.0.0.0.2.4.c.0.8.b.d.0.1.0.0.2
380 6. There is a new ACL control called "debug", to enable debug logging.
381 This allows selective logging of certain incoming transactions within
382 production environments, with some care. It takes two options, "tag"
383 and "opts"; "tag" is included in the filename of the log and "opts"
384 is used as per the -d<options> command-line option. Examples, which
385 don't all make sense in all contexts:
388 control = debug/tag=.$sender_host_address
389 control = debug/opts=+expand+acl
390 control = debug/tag=.$message_exim_id/opts=+expand
392 7. It has always been implicit in the design and the documentation that
393 "the Exim user" is not root. src/EDITME said that using root was
394 "very strongly discouraged". This is not enough to keep people from
395 shooting themselves in the foot in days when many don't configure Exim
396 themselves but via package build managers. The security consequences of
397 running various bits of network code are severe if there should be bugs in
398 them. As such, the Exim user may no longer be root. If configured
399 statically, Exim will refuse to build. If configured as ref:user then Exim
400 will exit shortly after start-up. If you must shoot yourself in the foot,
401 then henceforth you will have to maintain your own local patches to strip
404 8. There is a new expansion condition, bool_lax{}. Where bool{} uses the ACL
405 condition logic to determine truth/failure and will fail to expand many
406 strings, bool_lax{} uses the router condition logic, where most strings
408 Note: bool{00} is false, bool_lax{00} is true.
410 9. Routers now support multiple "condition" tests.
412 10. There is now a runtime configuration option "tcp_wrappers_daemon_name".
413 Setting this allows an admin to define which entry in the tcpwrappers
414 config file will be used to control access to the daemon. This option
415 is only available when Exim is built with USE_TCP_WRAPPERS. The
416 default value is set at build time using the TCP_WRAPPERS_DAEMON_NAME
419 11. [POSSIBLE CONFIG BREAKAGE] The default value for system_filter_user is now
420 the Exim run-time user, instead of root.
422 12. [POSSIBLE CONFIG BREAKAGE] ALT_CONFIG_ROOT_ONLY is no longer optional and
423 is forced on. This is mitigated by the new build option
424 TRUSTED_CONFIG_LIST which defines a list of configuration files which
425 are trusted; one per line. If a config file is owned by root and matches
426 a pathname in the list, then it may be invoked by the Exim build-time
427 user without Exim relinquishing root privileges.
429 13. [POSSIBLE CONFIG BREAKAGE] The Exim user is no longer automatically
430 trusted to supply -D<Macro[=Value]> overrides on the command-line. Going
431 forward, we recommend using TRUSTED_CONFIG_LIST with shim configs that
432 include the main config. As a transition mechanism, we are temporarily
433 providing a work-around: the new build option WHITELIST_D_MACROS provides
434 a colon-separated list of macro names which may be overridden by the Exim
435 run-time user. The values of these macros are constrained to the regex
436 ^[A-Za-z0-9_/.-]*$ (which explicitly does allow for empty values).
442 1. TWO SECURITY FIXES: one relating to mail-spools which are globally
443 writable, the other to locking of MBX folders (not mbox).
445 2. MySQL stored procedures are now supported.
447 3. The dkim_domain transport option is now a list, not a single string, and
448 messages will be signed for each element in the list (discarding
451 4. The 4.70 release unexpectedly changed the behaviour of dnsdb TXT lookups
452 in the presence of multiple character strings within the RR. Prior to 4.70,
453 only the first string would be returned. The dnsdb lookup now, by default,
454 preserves the pre-4.70 semantics, but also now takes an extended output
455 separator specification. The separator can be followed by a semicolon, to
456 concatenate the individual text strings together with no join character,
457 or by a comma and a second separator character, in which case the text
458 strings within a TXT record are joined on that second character.
459 Administrators are reminded that DNS provides no ordering guarantees
460 between multiple records in an RRset. For example:
462 foo.example. IN TXT "a" "b" "c"
463 foo.example. IN TXT "d" "e" "f"
465 ${lookup dnsdb{>/ txt=foo.example}} -> "a/d"
466 ${lookup dnsdb{>/; txt=foo.example}} -> "def/abc"
467 ${lookup dnsdb{>/,+ txt=foo.example}} -> "a+b+c/d+e+f"
473 1. Native DKIM support without an external library.
474 (Note that if no action to prevent it is taken, a straight upgrade will
475 result in DKIM verification of all signed incoming emails. See spec
476 for details on conditionally disabling)
478 2. Experimental DCC support via dccifd (contributed by Wolfgang Breyha).
480 3. There is now a bool{} expansion condition which maps certain strings to
481 true/false condition values (most likely of use in conjunction with the
482 and{} expansion operator).
484 4. The $spam_score, $spam_bar and $spam_report variables are now available
487 5. exim -bP now supports "macros", "macro_list" or "macro MACRO_NAME" as
488 options, provided that Exim is invoked by an admin_user.
490 6. There is a new option gnutls_compat_mode, when linked against GnuTLS,
491 which increases compatibility with older clients at the cost of decreased
492 security. Don't set this unless you need to support such clients.
494 7. There is a new expansion operator, ${randint:...} which will produce a
495 "random" number less than the supplied integer. This randomness is
496 not guaranteed to be cryptographically strong, but depending upon how
497 Exim was built may be better than the most naive schemes.
499 8. Exim now explicitly ensures that SHA256 is available when linked against
502 9. The transport_filter_timeout option now applies to SMTP transports too.
508 1. Preliminary DKIM support in Experimental.
514 1. The body_linecount and body_zerocount C variables are now exported in the
517 2. When a dnslists lookup succeeds, the key that was looked up is now placed
518 in $dnslist_matched. When the key is an IP address, it is not reversed in
519 this variable (though it is, of course, in the actual lookup). In simple
522 deny dnslists = spamhaus.example
524 the key is also available in another variable (in this case,
525 $sender_host_address). In more complicated cases, however, this is not
526 true. For example, using a data lookup might generate a dnslists lookup
529 deny dnslists = spamhaus.example/<|192.168.1.2|192.168.6.7|...
531 If this condition succeeds, the value in $dnslist_matched might be
532 192.168.6.7 (for example).
534 3. Authenticators now have a client_condition option. When Exim is running as
535 a client, it skips an authenticator whose client_condition expansion yields
536 "0", "no", or "false". This can be used, for example, to skip plain text
537 authenticators when the connection is not encrypted by a setting such as:
539 client_condition = ${if !eq{$tls_cipher}{}}
541 Note that the 4.67 documentation states that $tls_cipher contains the
542 cipher used for incoming messages. In fact, during SMTP delivery, it
543 contains the cipher used for the delivery. The same is true for
546 4. There is now a -Mvc <message-id> option, which outputs a copy of the
547 message to the standard output, in RFC 2822 format. The option can be used
548 only by an admin user.
550 5. There is now a /noupdate option for the ratelimit ACL condition. It
551 computes the rate and checks the limit as normal, but it does not update
552 the saved data. This means that, in relevant ACLs, it is possible to lookup
553 the existence of a specified (or auto-generated) ratelimit key without
554 incrementing the ratelimit counter for that key.
556 In order for this to be useful, another ACL entry must set the rate
557 for the same key somewhere (otherwise it will always be zero).
562 # Read the rate; if it doesn't exist or is below the maximum
564 deny ratelimit = 100 / 5m / strict / noupdate
565 log_message = RATE: $sender_rate / $sender_rate_period \
566 (max $sender_rate_limit)
568 [... some other logic and tests...]
570 warn ratelimit = 100 / 5m / strict / per_cmd
571 log_message = RATE UPDATE: $sender_rate / $sender_rate_period \
572 (max $sender_rate_limit)
573 condition = ${if le{$sender_rate}{$sender_rate_limit}}
577 6. The variable $max_received_linelength contains the number of bytes in the
578 longest line that was received as part of the message, not counting the
579 line termination character(s).
581 7. Host lists can now include +ignore_defer and +include_defer, analagous to
582 +ignore_unknown and +include_unknown. These options should be used with
583 care, probably only in non-critical host lists such as whitelists.
585 8. There's a new option called queue_only_load_latch, which defaults true.
586 If set false when queue_only_load is greater than zero, Exim re-evaluates
587 the load for each incoming message in an SMTP session. Otherwise, once one
588 message is queued, the remainder are also.
590 9. There is a new ACL, specified by acl_smtp_notquit, which is run in most
591 cases when an SMTP session ends without sending QUIT. However, when Exim
592 itself is is bad trouble, such as being unable to write to its log files,
593 this ACL is not run, because it might try to do things (such as write to
594 log files) that make the situation even worse.
596 Like the QUIT ACL, this new ACL is provided to make it possible to gather
597 statistics. Whatever it returns (accept or deny) is immaterial. The "delay"
598 modifier is forbidden in this ACL.
600 When the NOTQUIT ACL is running, the variable $smtp_notquit_reason is set
601 to a string that indicates the reason for the termination of the SMTP
602 connection. The possible values are:
604 acl-drop Another ACL issued a "drop" command
605 bad-commands Too many unknown or non-mail commands
606 command-timeout Timeout while reading SMTP commands
607 connection-lost The SMTP connection has been lost
608 data-timeout Timeout while reading message data
609 local-scan-error The local_scan() function crashed
610 local-scan-timeout The local_scan() function timed out
611 signal-exit SIGTERM or SIGINT
612 synchronization-error SMTP synchronization error
613 tls-failed TLS failed to start
615 In most cases when an SMTP connection is closed without having received
616 QUIT, Exim sends an SMTP response message before actually closing the
617 connection. With the exception of acl-drop, the default message can be
618 overridden by the "message" modifier in the NOTQUIT ACL. In the case of a
619 "drop" verb in another ACL, it is the message from the other ACL that is
622 10. For MySQL and PostgreSQL lookups, it is now possible to specify a list of
623 servers with individual queries. This is done by starting the query with
624 "servers=x:y:z;", where each item in the list may take one of two forms:
626 (1) If it is just a host name, the appropriate global option (mysql_servers
627 or pgsql_servers) is searched for a host of the same name, and the
628 remaining parameters (database, user, password) are taken from there.
630 (2) If it contains any slashes, it is taken as a complete parameter set.
632 The list of servers is used in exactly the same was as the global list.
633 Once a connection to a server has happened and a query has been
634 successfully executed, processing of the lookup ceases.
636 This feature is intended for use in master/slave situations where updates
637 are occurring, and one wants to update a master rather than a slave. If the
638 masters are in the list for reading, you might have:
640 mysql_servers = slave1/db/name/pw:slave2/db/name/pw:master/db/name/pw
642 In an updating lookup, you could then write
644 ${lookup mysql{servers=master; UPDATE ...}
646 If, on the other hand, the master is not to be used for reading lookups:
648 pgsql_servers = slave1/db/name/pw:slave2/db/name/pw
650 you can still update the master by
652 ${lookup pgsql{servers=master/db/name/pw; UPDATE ...}
654 11. The message_body_newlines option (default FALSE, for backwards
655 compatibility) can be used to control whether newlines are present in
656 $message_body and $message_body_end. If it is FALSE, they are replaced by
663 1. There is a new log selector called smtp_no_mail, which is not included in
664 the default setting. When it is set, a line is written to the main log
665 whenever an accepted SMTP connection terminates without having issued a
668 2. When an item in a dnslists list is followed by = and & and a list of IP
669 addresses, the behaviour was not clear when the lookup returned more than
670 one IP address. This has been solved by the addition of == and =& for "all"
671 rather than the default "any" matching.
673 3. Up till now, the only control over which cipher suites GnuTLS uses has been
674 for the cipher algorithms. New options have been added to allow some of the
675 other parameters to be varied.
677 4. There is a new compile-time option called ENABLE_DISABLE_FSYNC. When it is
678 set, Exim compiles a runtime option called disable_fsync.
680 5. There is a new variable called $smtp_count_at_connection_start.
682 6. There's a new control called no_pipelining.
684 7. There are two new variables called $sending_ip_address and $sending_port.
685 These are set whenever an SMTP connection to another host has been set up.
687 8. The expansion of the helo_data option in the smtp transport now happens
688 after the connection to the server has been made.
690 9. There is a new expansion operator ${rfc2047d: that decodes strings that
691 are encoded as per RFC 2047.
693 10. There is a new log selector called "pid", which causes the current process
694 id to be added to every log line, in square brackets, immediately after the
697 11. Exim has been modified so that it flushes SMTP output before implementing
698 a delay in an ACL. It also flushes the output before performing a callout,
699 as this can take a substantial time. These behaviours can be disabled by
700 obeying control = no_delay_flush or control = no_callout_flush,
701 respectively, at some earlier stage of the connection.
703 12. There are two new expansion conditions that iterate over a list. They are
704 called forany and forall.
706 13. There's a new global option called dsn_from that can be used to vary the
707 contents of From: lines in bounces and other automatically generated
708 messages ("delivery status notifications" - hence the name of the option).
710 14. The smtp transport has a new option called hosts_avoid_pipelining.
712 15. By default, exigrep does case-insensitive matches. There is now a -I option
713 that makes it case-sensitive.
715 16. A number of new features ("addresses", "map", "filter", and "reduce") have
716 been added to string expansions to make it easier to process lists of
717 items, typically addresses.
719 17. There's a new ACL modifier called "continue". It does nothing of itself,
720 and processing of the ACL always continues with the next condition or
721 modifier. It is provided so that the side effects of expanding its argument
724 18. It is now possible to use newline and other control characters (those with
725 values less than 32, plus DEL) as separators in lists.
727 19. The exigrep utility now has a -v option, which inverts the matching
730 20. The host_find_failed option in the manualroute router can now be set to
737 No new features were added to 4.66.
743 No new features were added to 4.65.
749 1. ACL variables can now be given arbitrary names, as long as they start with
750 "acl_c" or "acl_m" (for connection variables and message variables), are at
751 least six characters long, with the sixth character being either a digit or
754 2. There is a new ACL modifier called log_reject_target. It makes it possible
755 to specify which logs are used for messages about ACL rejections.
757 3. There is a new authenticator called "dovecot". This is an interface to the
758 authentication facility of the Dovecot POP/IMAP server, which can support a
759 number of authentication methods.
761 4. The variable $message_headers_raw provides a concatenation of all the
762 messages's headers without any decoding. This is in contrast to
763 $message_headers, which does RFC2047 decoding on the header contents.
765 5. In a DNS black list, if two domain names, comma-separated, are given, the
766 second is used first to do an initial check, making use of any IP value
767 restrictions that are set. If there is a match, the first domain is used,
768 without any IP value restrictions, to get the TXT record.
770 6. All authenticators now have a server_condition option.
772 7. There is a new command-line option called -Mset. It is useful only in
773 conjunction with -be (that is, when testing string expansions). It must be
774 followed by a message id; Exim loads the given message from its spool
775 before doing the expansions.
777 8. Another similar new command-line option is called -bem. It operates like
778 -be except that it must be followed by the name of a file that contains a
781 9. When an address is delayed because of a 4xx response to a RCPT command, it
782 is now the combination of sender and recipient that is delayed in
783 subsequent queue runs until its retry time is reached.
785 10. Unary negation and the bitwise logical operators and, or, xor, not, and
786 shift, have been added to the eval: and eval10: expansion items.
788 11. The variables $interface_address and $interface_port have been renamed
789 as $received_ip_address and $received_port, to make it clear that they
790 relate to message reception rather than delivery. (The old names remain
791 available for compatibility.)
793 12. The "message" modifier can now be used on "accept" and "discard" acl verbs
794 to vary the message that is sent when an SMTP command is accepted.
800 1. There is a new Boolean option called filter_prepend_home for the redirect
803 2. There is a new acl, set by acl_not_smtp_start, which is run right at the
804 start of receiving a non-SMTP message, before any of the message has been
807 3. When an SMTP error message is specified in a "message" modifier in an ACL,
808 or in a :fail: or :defer: message in a redirect router, Exim now checks the
809 start of the message for an SMTP error code.
811 4. There is a new parameter for LDAP lookups called "referrals", which takes
812 one of the settings "follow" (the default) or "nofollow".
814 5. Version 20070721.2 of exipick now included, offering these new options:
816 After all other sorting options have bee processed, reverse order
817 before displaying messages (-R is synonym).
819 Randomize order of matching messages before displaying.
821 Instead of displaying the matching messages, display the sum
823 --sort <variable>[,<variable>...]
824 Before displaying matching messages, sort the messages according to
825 each messages value for each variable.
827 Negate the value for every test (returns inverse output from the
828 same criteria without --not).
834 1. The ${readsocket expansion item now supports Internet domain sockets as well
835 as Unix domain sockets. If the first argument begins "inet:", it must be of
836 the form "inet:host:port". The port is mandatory; it may be a number or the
837 name of a TCP port in /etc/services. The host may be a name, or it may be an
838 IP address. An ip address may optionally be enclosed in square brackets.
839 This is best for IPv6 addresses. For example:
841 ${readsocket{inet:[::1]:1234}{<request data>}...
843 Only a single host name may be given, but if looking it up yield more than
844 one IP address, they are each tried in turn until a connection is made. Once
845 a connection has been made, the behaviour is as for ${readsocket with a Unix
848 2. If a redirect router sets up file or pipe deliveries for more than one
849 incoming address, and the relevant transport has batch_max set greater than
850 one, a batch delivery now occurs.
852 3. The appendfile transport has a new option called maildirfolder_create_regex.
853 Its value is a regular expression. For a maildir delivery, this is matched
854 against the maildir directory; if it matches, Exim ensures that a
855 maildirfolder file is created alongside the new, cur, and tmp directories.
861 The documentation is up-to-date for the 4.61 release. Major new features since
862 the 4.60 release are:
864 . An option called disable_ipv6, to disable the use of IPv6 completely.
866 . An increase in the number of ACL variables to 20 of each type.
868 . A change to use $auth1, $auth2, and $auth3 in authenticators instead of $1,
869 $2, $3, (though those are still set) because the numeric variables get used
870 for other things in complicated expansions.
872 . The default for rfc1413_query_timeout has been changed from 30s to 5s.
874 . It is possible to use setclassresources() on some BSD OS to control the
875 resources used in pipe deliveries.
877 . A new ACL modifier called add_header, which can be used with any verb.
879 . More errors are detectable in retry rules.
881 There are a number of other additions too.
887 The documentation is up-to-date for the 4.60 release. Major new features since
888 the 4.50 release are:
890 . Support for SQLite.
892 . Support for IGNOREQUOTA in LMTP.
894 . Extensions to the "submission mode" features.
896 . Support for Client SMTP Authorization (CSA).
898 . Support for ratelimiting hosts and users.
900 . New expansion items to help with the BATV "prvs" scheme.
902 . A "match_ip" condition, that matches an IP address against a list.
904 There are many more minor changes.
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