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 Git before the documentation is updated. Once
7 the documentation is updated, this file is reduced to a short list.
11 1. A sieve_inbox option for redirect routers
13 2. A "connection_id" variable
15 3. Events smtp:fail:protocol and smtp:fail:syntax
17 4. JSON and LDAP lookup support, SPF support, all the router and authenticator
18 drivers, and all the transport drivers except smtp, can now be built as
23 1. The dkim_status ACL condition may now be used in data ACLs
25 2. The dkim_verbose logging control also enables logging of signing
27 3. The dkim_timestamps signing option now accepts zero to include a current
28 timestamp but no expiry timestamp. Code by Simon Arlott; testsuite
31 4. The recipients_max main option is now expanded
33 5. Setting variables for "exim -be" can set a tainted value
37 7. The dsearch lookup supports search for a sub-path
39 8. Include mailtest utility for simple connection checking
41 9. Add SMTP WELLKNOWN extension
43 10. Sqlite3 can be used for the hints databases (vs. DBD, NDB, GBDM, TDB).
44 Add "USE_SQLITE = y" and "DBMLIB = -lsqlite3" in Local/Makefile, to
45 override the settings done in the OS/Makefile-<platform> file
50 1. The expansion-test facility (exim -be) can set variables.
52 2. An event on a failing SMTP AUTH, for both client and server operations.
54 3. Variable $sender_helo_verified with the result of an ACL "verify = helo".
56 4. Predefined macros for expansion items, operators, conditions and variables.
58 5. The smtp transport option "max_rcpt" is now expanded before use.
60 6. The tls_eccurve option for OpenSSL now takes a list of group names.
62 7. Queue runners for several queues can now be started from one daemon.
64 8. New utility exim_msgdate converts message-ids to human readable format.
66 9. An expansion operator for wrapping long header lines.
68 10. A commandline option to print just the message IDs of the queue
70 11. An option for the ${readsocket } expansion to set an SNI for TLS.
72 12. The ACL remove_header modifier can take a pattern.
74 13. Variable $recipients_list, a properly-quoted exim list.
76 14. A log_selector for an incoming connection ID.
81 1. A new ACL condition: seen. Records/tests a timestamp against a key.
83 2. A variant of the "mask" expansion operator to give normalised IPv6.
85 3. UTC output option for exim_dumpdb, exim_fixdb.
87 4. An event for failing TLS connects to the daemon.
89 5. The ACL "debug" control gains options "stop", "pretrigger" and "trigger".
91 6. Query-style lookups are now checked for quoting, if the query string is
92 built using untrusted data ("tainted"). For now lack of quoting is merely
93 logged; a future release will upgrade this to an error.
95 7. The expansion conditions match_<list-type> and inlist now set $value for
96 the expansion of the "true" result of the ${if}. With a static list, this
97 can be used for de-tainting.
99 8. Recipient verify callouts now set $domain_data & $local_part_data, with
105 1. The fast-ramp two phase queue run support, previously experimental, is
106 now supported by default.
108 2. The native SRS support, previously experimental, is now supported. It is
109 not built unless specified in the Local/Makefile.
111 3. TLS resumption support, previously experimental, is now supported and
112 included in default builds.
114 4. Single-key LMDB lookups, previously experimental, are now supported.
115 The support is not built unless specified in the Local/Makefile.
117 5. Option "message_linelength_limit" on the smtp transport to enforce (by
118 default) the RFC 998 character limit.
120 6. An option to ignore the cache on a lookup.
122 7. Quota checking during reception (i.e. at SMTP time) for appendfile-
123 transport-managed quotas.
125 8. Sqlite lookups accept a "file=<path>" option to specify a per-operation
126 db file, replacing the previous prefix to the SQL string (which had
127 issues when the SQL used tainted values).
129 9. Lsearch lookups accept a "ret=full" option, to return both the portion
130 of the line matching the key, and the remainder.
132 10. A command-line option to have a daemon not create a notifier socket.
134 11. Faster TLS startup. When various configuration options contain no
135 expandable elements, the information can be preloaded and cached rather
136 than the previous behaviour of always loading at startup time for every
137 connection. This helps particularly for the CA bundle.
139 12. Proxy Protocol Timeout is configurable via "proxy_protocol_timeout"
142 13. Option "smtp_accept_max_per_connection" is now expanded.
144 14. Log selector "queue_time_exclusive", enabled by default, to exclude the
145 time taken for reception from QT log elements.
147 15. Main option "smtp_backlog_monitor", to set a level above which listen
148 socket backlogs are logged.
150 16. Main option "hosts_require_helo", requiring HELO or EHLO before MAIL.
152 17. A main config option "allow_insecure_tainted_data" allows to turn
154 18. TLS ALPN handling. By default, refuse TLS connections that try to specify
155 a non-smtp (eg. http) use. Options for customising.
157 19. Support for MacOS (darwin) has been dropped.
163 1. EXPERIMENTAL_SRS_NATIVE optional build feature. See the experimental.spec
166 2. Channel-binding for authenticators is now supported under OpenSSL.
167 Previously it was GnuTLS-only.
169 3. A msg:defer event.
171 4. Client-side support in the gsasl authenticator. Tested against the
172 plaintext driver for PLAIN; only against itself for SCRAM-SHA-1 and
173 SCRAM-SHA-1-PLUS methods.
175 5. Server-side support in the gsasl authenticator for encrypted passwords, as
176 an alternate for the existing plaintext.
178 6. Variable $local_part_data now also set by router check_local_user option,
179 with an de-tainted version of $local_part.
181 7. Named-list definitions can now be prefixed "hide" so that "-bP" commands do
182 not output the content. Previously this could only be done on options.
184 8. As an experimental feature, the dovecot authentication driver supports inet
185 sockets. Previously it was unix-domain sockets only.
187 9. The ACL control "queue_only" can also be spelled "queue", and now takes an
188 option "first_pass_route" to do the same as a "-odqs" on the command line.
190 10. Items specified for the router and transport headers_remove option can use
191 a trailing asterisk to specify globbing.
193 11. New $queue_size variable.
195 12. New variables $local_part_{pre,suf}fix_v.
197 13. New main option "sqlite_dbfile", for use in preference to prefixing the
198 lookup string. The older method fails when tainted variables are used
199 in the lookup, as the filename becomes tainted. The new method keeps the
202 14. Options on the dsearch lookup, to return the full path and to filter
203 filetypes for matching.
205 15. Options on pgsql and mysql lookups, to specify server separate from the
208 16. An option on all single-key lookups, to return (on a hit) a de-tainted
209 version of the lookup key rather than the looked-up data.
211 17. $domain_data and $local_part_data are now set by all list-match successes.
212 Previously only list items that performed lookups did so.
213 Also, matching list items that are tail-match or RE-match now set the
214 numeric variables $0 (etc) in the same way os other RE matches.
216 18. Expansion item ${listquote {<char} {<item>}}.
218 19. An option for the ${readsocket {}{}{}} expansion to make the result data
221 20. dkim_verify_min_keysizes, a list of minimum acceptable public-key sizes.
223 21. bounce_message_file and warn_message_file are now expanded before use.
225 22. New main config option spf_smtp_comment_template to customise the
226 $spf_smtp_comment variable
233 1. An "external" authenticator, per RFC 4422 Appendix A.
235 2. A JSON lookup type, and JSON variants of the forall/any expansion conditions.
237 3. Variables $tls_in_cipher_std, $tls_out_cipher_std giving the RFC names
240 4. Log_selectors "msg_id" (on by default) and "msg_id_created".
242 5. A case_insensitive option for verify=not_blind.
244 6. EXPERIMENTAL_TLS_RESUME optional build feature. See the experimental.spec
247 7. A main option exim_version to override the version Exim
248 reports in verious places ($exim_version, $version_number).
250 8. Expansion operator ${sha2_N:} for N=256, 384, 512.
252 9. Router variables, $r_... settable from router options and usable in routers
255 10. The spf lookup now supports IPv6.
257 11. Main options for DKIM verify to filter hash and key types.
259 12. With TLS1.3, support for full-chain OCSP stapling.
261 13. Dual-certificate stacks on servers now support OCSP stapling, under OpenSSL.
263 14: An smtp:ehlo transport event, for observability of the remote offered features.
265 15: Support under OpenSSL for writing NSS-style key files for packet-capture
266 decode. The environment variable SSLKEYLOGFILE is used; if an absolute path
267 it must indicate a file under the spool directory; if relative the the spool
268 directory is prepended. Works on the server side only. Support under
269 GnuTLS was already there, being done purely by the library (server side
270 only, and exim must be run as root).
272 16: Command-line option to move messages from one named queue to another.
274 17. Variables $tls_in_ver, $tls_out_ver.
280 1. ${l_header:<name>} and ${l_h:<name>} expansion items, giving a colon-sep
281 list when there are multiple headers having a given name. This matters
282 when individual headers are wrapped onto multiple lines; with previous
283 facilities hard to parse.
285 2. The ${readsocket } expansion item now takes a "tls" option, doing the
288 3. EXPERIMENTAL_REQUIRETLS and EXPERIMENTAL_PIPE_CONNECT optional build
289 features. See the experimental.spec file.
291 4. If built with SUPPORT_I18N a "utf8_downconvert" option on the smtp transport.
293 5. A "pipelining" log_selector.
295 6. Builtin macros for supported log_selector and openssl_options values.
297 7. JSON variants of the ${extract } expansion item.
299 8. A "noutf8" debug option, for disabling the UTF-8 characters in debug output.
301 9. TCP Fast Open support on MacOS.
306 1. Dual-certificate stacks on servers now support OCSP stapling, under GnuTLS
307 version 3.5.6 or later.
309 2. DANE is now supported under GnuTLS version 3.0.0 or later. Both GnuTLS and
310 OpenSSL versions are moved to mainline support from Experimental.
311 New SMTP transport option "dane_require_tls_ciphers".
313 3. Feature macros for the compiled-in set of malware scanner interfaces.
315 4. SPF support is promoted from Experimental to mainline status. The template
316 src/EDITME makefile does not enable its inclusion.
318 5. Logging control for DKIM verification. The existing DKIM log line is
319 controlled by a "dkim_verbose" selector which is _not_ enabled by default.
320 A new tag "DKIM=<domain>" is added to <= lines by default, controlled by
321 a "dkim" log_selector.
323 6. Receive duration on <= lines, under a new log_selector "receive_time".
325 7. Options "ipv4_only" and "ipv4_prefer" on the dnslookup router and on
326 routing rules in the manualroute router.
328 8. Expansion item ${sha3:<string>} / ${sha3_<N>:<string>} now also supported
329 under OpenSSL version 1.1.1 or later.
331 9. DKIM operations can now use the Ed25519 algorithm in addition to RSA, under
332 GnuTLS 3.6.0 or OpenSSL 1.1.1 or later.
334 10. Builtin feature-macros _CRYPTO_HASH_SHA3 and _CRYPTO_SIGN_ED25519, library
337 11. "exim -bP macro <name>" returns caller-usable status.
339 12. Expansion item ${authresults {<machine>}} for creating an
340 Authentication-Results: header.
342 13. EXPERIMENTAL_ARC. See the experimental.spec file.
343 See also new util/renew-opendmarc-tlds.sh script for use with DMARC/ARC.
345 14: A dane:fail event, intended to facilitate reporting.
347 15. "Lightweight" support for Redis Cluster. Requires redis_servers list to
348 contain all the servers in the cluster, all of which must be reachable from
349 the running exim instance. If the cluster has master/slave replication, the
350 list must contain all the master and slave servers.
352 16. Add an option to the Avast scanner interface: "pass_unscanned". This
353 allows to treat unscanned files as clean. Files may be unscanned for
354 several reasons: decompression bombs, broken archives.
360 1. PKG_CONFIG_PATH can now be set in Local/Makefile;
361 wildcards will be expanded, values are collapsed.
363 2. The ${readsocket } expansion now takes an option to not shutdown the
364 connection after sending the query string. The default remains to do so.
366 3. An smtp transport option "hosts_noproxy_tls" to control whether multiple
367 deliveries on a single TCP connection can maintain a TLS connection
368 open. By default disabled for all hosts, doing so saves the cost of
369 making new TLS sessions, at the cost of having to proxy the data via
370 another process. Logging is also affected.
372 4. A malware connection type for the FPSCAND protocol.
374 5. An option for recipient verify callouts to hold the connection open for
375 further recipients and for delivery.
377 6. The reproducible build $SOURCE_DATE_EPOCH environment variable is now
380 7. Optionally, an alternate format for spool data-files which matches the
381 wire format - meaning more efficient reception and transmission (at the
382 cost of difficulty with standard Unix tools). Only used for messages
383 received using the ESMTP CHUNKING option, and when a new main-section
384 option "spool_wireformat" (false by default) is set.
386 8. New main configuration option "commandline_checks_require_admin" to
387 restrict who can use various introspection options.
389 9. New option modifier "no_check" for quota and quota_filecount
390 appendfile transport.
392 10. Variable $smtp_command_history returning a comma-sep list of recent
395 11. Millisecond timetamps in logs, on log_selector "millisec". Also affects
396 log elements QT, DT and D, and timstamps in debug output.
398 12. TCP Fast Open logging. As a server, logs when the SMTP banner was sent
399 while still in SYN_RECV state; as a client logs when the connection
400 is opened with a TFO cookie.
402 13. DKIM support for multiple signing, by domain and/or key-selector.
403 DKIM support for multiple hashes, and for alternate-identity tags.
404 Builtin macro with default list of signed headers.
405 Better syntax for specifying oversigning.
406 The DKIM ACL can override verification status, and status is visible in
409 14. Exipick understands -C|--config for an alternative Exim
412 15. TCP Fast Open used, with data-on-SYN, for client SMTP via SOCKS5 proxy,
413 for ${readsocket } expansions, and for ClamAV.
415 16. The "-be" expansion test mode now supports macros. Macros are expanded
416 in test lines, and new macros can be defined.
418 17. Support for server-side dual-certificate-stacks (eg. RSA + ECDSA).
424 1. Allow relative config file names for ".include"
426 2. A main-section config option "debug_store" to control the checks on
427 variable locations during store-reset. Normally false but can be enabled
428 when a memory corruption issue is suspected on a production system.
434 1. The new perl_taintmode option allows to run the embedded perl
435 interpreter in taint mode.
437 2. New log_selector: dnssec, adds a "DS" tag to acceptance and delivery lines.
439 3. Speculative debugging, via a "kill" option to the "control=debug" ACL
442 4. New expansion item ${sha3:<string>} / ${sha3_<N>:<string>}.
443 N can be 224, 256 (default), 384, 512.
444 With GnuTLS 3.5.0 or later, only.
446 5. Facility for named queues: A command-line argument can specify
447 the queue name for a queue operation, and an ACL modifier can set
448 the queue to be used for a message. A $queue_name variable gives
451 6. New expansion operators base32/base32d.
453 7. The CHUNKING ESMTP extension from RFC 3030. May give some slight
454 performance increase and network load decrease. Main config option
455 chunking_advertise_hosts, and smtp transport option hosts_try_chunking
458 8. LMDB lookup support, as Experimental. Patch supplied by Andrew Colin Kissa.
460 9. Expansion operator escape8bit, like escape but not touching newline etc..
462 10. Feature macros, generated from compile options. All start with "_HAVE_"
463 and go on with some roughly recognisable name. Driver macros, for
464 router, transport and authentication drivers; names starting with "_DRIVER_".
465 Option macros, for each configuration-file option; all start with "_OPT_".
466 Use the "-bP macros" command-line option to see what is present.
468 11. Integer values for options can take a "G" multiplier.
470 12. defer=pass option for the ACL control cutthrough_delivery, to reflect 4xx
471 returns from the target back to the initiator, rather than spooling the
474 13. New built-in constants available for tls_dhparam and default changed.
476 14. If built with EXPERIMENTAL_QUEUEFILE, a queuefile transport, for writing
477 out copies of the message spool files for use by 3rd-party scanners.
479 15. A new option on the smtp transport, hosts_try_fastopen. If the system
480 supports it (on Linux it must be enabled in the kernel by the sysadmin)
481 try to use RFC 7413 "TCP Fast Open". No data is sent on the SYN segment
482 but it permits a peer that also supports the facility to send its SMTP
483 banner immediately after the SYN,ACK segment rather then waiting for
484 another ACK - so saving up to one roundtrip time. Because it requires
485 previous communication with the peer (we save a cookie from it) this
486 will only become active on frequently-contacted destinations.
488 16. A new syslog_pid option to suppress PID duplication in syslog lines.
494 1. The ACL conditions regex and mime_regex now capture substrings
495 into numeric variables $regex1 to 9, like the "match" expansion condition.
497 2. New $callout_address variable records the address used for a spam=,
498 malware= or verify= callout.
500 3. Transports now take a "max_parallel" option, to limit concurrency.
502 4. Expansion operators ${ipv6norm:<string>} and ${ipv6denorm:<string>}.
503 The latter expands to a 8-element colon-sep set of hex digits including
504 leading zeroes. A trailing ipv4-style dotted-decimal set is converted
505 to hex. Pure ipv4 addresses are converted to IPv4-mapped IPv6.
506 The former operator strips leading zeroes and collapses the longest
507 set of 0-groups to a double-colon.
509 5. New "-bP config" support, to dump the effective configuration.
511 6. New $dkim_key_length variable.
513 7. New base64d and base64 expansion items (the existing str2b64 being a
514 synonym of the latter). Add support in base64 for certificates.
516 8. New main configuration option "bounce_return_linesize_limit" to
517 avoid oversize bodies in bounces. The default value matches RFC
520 9. New $initial_cwd expansion variable.
526 1. Support for using the system standard CA bundle.
528 2. New expansion items $config_file, $config_dir, containing the file
529 and directory name of the main configuration file. Also $exim_version.
531 3. New "malware=" support for Avast.
533 4. New "spam=" variant option for Rspamd.
535 5. Assorted options on malware= and spam= scanners.
537 6. A command-line option to write a comment into the logfile.
539 7. If built with EXPERIMENTAL_SOCKS feature enabled, the smtp transport can
540 be configured to make connections via socks5 proxies.
542 8. If built with EXPERIMENTAL_INTERNATIONAL, support is included for
543 the transmission of UTF-8 envelope addresses.
545 9. If built with EXPERIMENTAL_INTERNATIONAL, an expansion item for a commonly
546 used encoding of Maildir folder names.
548 10. A logging option for slow DNS lookups.
550 11. New ${env {<variable>}} expansion.
552 12. A non-SMTP authenticator using information from TLS client certificates.
554 13. Main option "tls_eccurve" for selecting an Elliptic Curve for TLS.
555 Patch originally by Wolfgang Breyha.
557 14. Main option "dns_trust_aa" for trusting your local nameserver at the
558 same level as DNSSEC.
563 1. If built with EXPERIMENTAL_DANE feature enabled, Exim will follow the
564 DANE SMTP draft to assess a secure chain of trust of the certificate
565 used to establish the TLS connection based on a TLSA record in the
566 domain of the sender.
568 2. The EXPERIMENTAL_TPDA feature has been renamed to EXPERIMENTAL_EVENT
569 and several new events have been created. The reason is because it has
570 been expanded beyond just firing events during the transport phase. Any
571 existing TPDA transport options will have to be rewritten to use a new
572 $event_name expansion variable in a condition. Refer to the
573 experimental-spec.txt for details and examples.
575 3. The EXPERIMENTAL_CERTNAMES features is an enhancement to verify that
576 server certs used for TLS match the result of the MX lookup. It does
577 not use the same mechanism as DANE.
587 1. If built with the EXPERIMENTAL_PROXY feature enabled, Exim can be
588 configured to expect an initial header from a proxy that will make the
589 actual external source IP:host be used in exim instead of the IP of the
590 proxy that is connecting to it.
592 2. New verify option header_names_ascii, which will check to make sure
593 there are no non-ASCII characters in header names. Exim itself handles
594 those non-ASCII characters, but downstream apps may not, so Exim can
595 detect and reject if those characters are present.
597 3. New expansion operator ${utf8clean:string} to replace malformed UTF8
598 codepoints with valid ones.
600 4. New malware type "sock". Talks over a Unix or TCP socket, sending one
601 command line and matching a regex against the return data for trigger
602 and a second regex to extract malware_name. The mail spoolfile name can
603 be included in the command line.
605 5. The smtp transport now supports options "tls_verify_hosts" and
606 "tls_try_verify_hosts". If either is set the certificate verification
607 is split from the encryption operation. The default remains that a failed
608 verification cancels the encryption.
610 6. New SERVERS override of default ldap server list. In the ACLs, an ldap
611 lookup can now set a list of servers to use that is different from the
614 7. New command-line option -C for exiqgrep to specify alternate exim.conf
615 file when searching the queue.
617 8. OCSP now supports GnuTLS also, if you have version 3.1.3 or later of that.
619 9. Support for DNSSEC on outbound connections.
621 10. New variables "tls_(in,out)_(our,peer)cert" and expansion item
622 "certextract" to extract fields from them. Hash operators md5 and sha1
623 work over them for generating fingerprints, and a new sha256 operator
626 11. PRDR is now supported dy default.
628 12. OCSP stapling is now supported by default.
630 13. If built with the EXPERIMENTAL_DSN feature enabled, Exim will output
631 Delivery Status Notification messages in MIME format, and negotiate
632 DSN features per RFC 3461.
638 1. New command-line option -bI:sieve will list all supported sieve extensions
639 of this Exim build on standard output, one per line.
640 ManageSieve (RFC 5804) providers managing scripts for use by Exim should
641 query this to establish the correct list to include in the protocol's
642 SIEVE capability line.
644 2. If the -n option is combined with the -bP option, then the name of an
645 emitted option is not output, only the value (if visible to you).
646 For instance, "exim -n -bP pid_file_path" should just emit a pathname
647 followed by a newline, and no other text.
649 3. When built with SUPPORT_TLS and USE_GNUTLS, the SMTP transport driver now
650 has a "tls_dh_min_bits" option, to set the minimum acceptable number of
651 bits in the Diffie-Hellman prime offered by a server (in DH ciphersuites)
652 acceptable for security. (Option accepted but ignored if using OpenSSL).
653 Defaults to 1024, the old value. May be lowered only to 512, or raised as
654 far as you like. Raising this may hinder TLS interoperability with other
655 sites and is not currently recommended. Lowering this will permit you to
656 establish a TLS session which is not as secure as you might like.
658 Unless you really know what you are doing, leave it alone.
660 4. If not built with DISABLE_DNSSEC, Exim now has the main option
661 dns_dnssec_ok; if set to 1 then Exim will initialise the resolver library
662 to send the DO flag to your recursive resolver. If you have a recursive
663 resolver, which can set the Authenticated Data (AD) flag in results, Exim
664 can now detect this. Exim does not perform validation itself, instead
665 relying upon a trusted path to the resolver.
667 Current status: work-in-progress; $sender_host_dnssec variable added.
669 5. DSCP support for outbound connections: on a transport using the smtp driver,
670 set "dscp = ef", for instance, to cause the connections to have the relevant
671 DSCP (IPv4 TOS or IPv6 TCLASS) value in the header.
673 Similarly for inbound connections, there is a new control modifier, dscp,
674 so "warn control = dscp/ef" in the connect ACL, or after authentication.
676 Supported values depend upon system libraries. "exim -bI:dscp" to list the
677 ones Exim knows of. You can also set a raw number 0..0x3F.
679 6. The -G command-line flag is no longer ignored; it is now equivalent to an
680 ACL setting "control = suppress_local_fixups". The -L command-line flag
681 is now accepted and forces use of syslog, with the provided tag as the
682 process name. A few other flags used by Sendmail are now accepted and
685 7. New cutthrough routing feature. Requested by a "control = cutthrough_delivery"
686 ACL modifier; works for single-recipient mails which are received on and
687 deliverable via SMTP. Using the connection made for a recipient verify,
688 if requested before the verify, or a new one made for the purpose while
689 the inbound connection is still active. The bulk of the mail item is copied
690 direct from the inbound socket to the outbound (as well as the spool file).
691 When the source notifies the end of data, the data acceptance by the destination
692 is negotiated before the acceptance is sent to the source. If the destination
693 does not accept the mail item, for example due to content-scanning, the item
694 is not accepted from the source and therefore there is no need to generate
695 a bounce mail. This is of benefit when providing a secondary-MX service.
696 The downside is that delays are under the control of the ultimate destination
699 The Received-by: header on items delivered by cutthrough is generated
700 early in reception rather than at the end; this will affect any timestamp
701 included. The log line showing delivery is recorded before that showing
702 reception; it uses a new ">>" tag instead of "=>".
704 To support the feature, verify-callout connections can now use ESMTP and TLS.
705 The usual smtp transport options are honoured, plus a (new, default everything)
706 hosts_verify_avoid_tls.
708 New variable families named tls_in_cipher, tls_out_cipher etc. are introduced
709 for specific access to the information for each connection. The old names
710 are present for now but deprecated.
712 Not yet supported: IGNOREQUOTA, SIZE, PIPELINING.
714 8. New expansion operators ${listnamed:name} to get the content of a named list
715 and ${listcount:string} to count the items in a list.
717 9. New global option "gnutls_allow_auto_pkcs11", defaults false. The GnuTLS
718 rewrite in 4.80 combines with GnuTLS 2.12.0 or later, to autoload PKCS11
719 modules. For some situations this is desirable, but we expect admin in
720 those situations to know they want the feature. More commonly, it means
721 that GUI user modules get loaded and are broken by the setuid Exim being
722 unable to access files specified in environment variables and passed
723 through, thus breakage. So we explicitly inhibit the PKCS11 initialisation
724 unless this new option is set.
726 Some older OS's with earlier versions of GnuTLS might not have pkcs11 ability,
727 so have also added a build option which can be used to build Exim with GnuTLS
728 but without trying to use any kind of PKCS11 support. Uncomment this in the
731 AVOID_GNUTLS_PKCS11=yes
733 10. The "acl = name" condition on an ACL now supports optional arguments.
734 New expansion item "${acl {name}{arg}...}" and expansion condition
735 "acl {{name}{arg}...}" are added. In all cases up to nine arguments
736 can be used, appearing in $acl_arg1 to $acl_arg9 for the called ACL.
737 Variable $acl_narg contains the number of arguments. If the ACL sets
738 a "message =" value this becomes the result of the expansion item,
739 or the value of $value for the expansion condition. If the ACL returns
740 accept the expansion condition is true; if reject, false. A defer
741 return results in a forced fail.
743 11. Routers and transports can now have multiple headers_add and headers_remove
744 option lines. The concatenated list is used.
746 12. New ACL modifier "remove_header" can remove headers before message gets
747 handled by routers/transports.
749 13. New dnsdb lookup pseudo-type "a+". A sequence of "a6" (if configured),
750 "aaaa" and "a" lookups is done and the full set of results returned.
752 14. New expansion variable $headers_added with content from ACL add_header
753 modifier (but not yet added to message).
755 15. New 8bitmime status logging option for received messages. Log field "M8S".
757 16. New authenticated_sender logging option, adding to log field "A".
759 17. New expansion variables $router_name and $transport_name. Useful
760 particularly for debug_print as -bt command-line option does not
761 require privilege whereas -d does.
763 18. If built with EXPERIMENTAL_PRDR, per-recipient data responses per a
764 proposed extension to SMTP from Eric Hall.
766 19. The pipe transport has gained the force_command option, to allow
767 decorating commands from user .forward pipe aliases with prefix
768 wrappers, for instance.
770 20. Callout connections can now AUTH; the same controls as normal delivery
773 21. Support for DMARC, using opendmarc libs, can be enabled. It adds new
774 options: dmarc_forensic_sender, dmarc_history_file, and dmarc_tld_file.
775 It adds new expansion variables $dmarc_ar_header, $dmarc_status,
776 $dmarc_status_text, and $dmarc_used_domain. It adds a new acl modifier
777 dmarc_status. It adds new control flags dmarc_disable_verify and
778 dmarc_enable_forensic. The default for the dmarc_tld_file option is
779 "/etc/exim/opendmarc.tlds" and can be changed via EDITME.
781 22. Add expansion variable $authenticated_fail_id, which is the username
782 provided to the authentication method which failed. It is available
783 for use in subsequent ACL processing (typically quit or notquit ACLs).
785 23. New ACL modifier "udpsend" can construct a UDP packet to send to a given
788 24. New ${hexquote:..string..} expansion operator converts non-printable
789 characters in the string to \xNN form.
791 25. Experimental TPDA (Transport Post Delivery Action) function added.
792 Patch provided by Axel Rau.
794 26. Experimental Redis lookup added. Patch provided by Warren Baker.
800 1. New authenticator driver, "gsasl". Server-only (at present).
801 This is a SASL interface, licensed under GPL, which can be found at
802 http://www.gnu.org/software/gsasl/.
803 This system does not provide sources of data for authentication, so
804 careful use needs to be made of the conditions in Exim.
806 2. New authenticator driver, "heimdal_gssapi". Server-only.
807 A replacement for using cyrus_sasl with Heimdal, now that $KRB5_KTNAME
808 is no longer honoured for setuid programs by Heimdal. Use the
809 "server_keytab" option to point to the keytab.
811 3. The "pkg-config" system can now be used when building Exim to reference
812 cflags and library information for lookups and authenticators, rather
813 than having to update "CFLAGS", "AUTH_LIBS", "LOOKUP_INCLUDE" and
814 "LOOKUP_LIBS" directly. Similarly for handling the TLS library support
815 without adjusting "TLS_INCLUDE" and "TLS_LIBS".
817 In addition, setting PCRE_CONFIG=yes will query the pcre-config tool to
818 find the headers and libraries for PCRE.
820 4. New expansion variable $tls_bits.
822 5. New lookup type, "dbmjz". Key is an Exim list, the elements of which will
823 be joined together with ASCII NUL characters to construct the key to pass
824 into the DBM library. Can be used with gsasl to access sasldb2 files as
827 6. OpenSSL now supports TLS1.1 and TLS1.2 with OpenSSL 1.0.1.
829 Avoid release 1.0.1a if you can. Note that the default value of
830 "openssl_options" is no longer "+dont_insert_empty_fragments", as that
831 increased susceptibility to attack. This may still have interoperability
832 implications for very old clients (see version 4.31 change 37) but
833 administrators can choose to make the trade-off themselves and restore
834 compatibility at the cost of session security.
836 7. Use of the new expansion variable $tls_sni in the main configuration option
837 tls_certificate will cause Exim to re-expand the option, if the client
838 sends the TLS Server Name Indication extension, to permit choosing a
839 different certificate; tls_privatekey will also be re-expanded. You must
840 still set these options to expand to valid files when $tls_sni is not set.
842 The SMTP Transport has gained the option tls_sni, which will set a hostname
843 for outbound TLS sessions, and set $tls_sni too.
845 A new log_selector, +tls_sni, has been added, to log received SNI values
846 for Exim as a server.
848 8. The existing "accept_8bitmime" option now defaults to true. This means
849 that Exim is deliberately not strictly RFC compliant. We're following
850 Dan Bernstein's advice in http://cr.yp.to/smtp/8bitmime.html by default.
851 Those who disagree, or know that they are talking to mail servers that,
852 even today, are not 8-bit clean, need to turn off this option.
854 9. Exim can now be started with -bw (with an optional timeout, given as
855 -bw<timespec>). With this, stdin at startup is a socket that is
856 already listening for connections. This has a more modern name of
857 "socket activation", but forcing the activated socket to fd 0. We're
858 interested in adding more support for modern variants.
860 10. ${eval } now uses 64-bit values on supporting platforms. A new "G" suffix
861 for numbers indicates multiplication by 1024^3.
863 11. The GnuTLS support has been revamped; the three options gnutls_require_kx,
864 gnutls_require_mac & gnutls_require_protocols are no longer supported.
865 tls_require_ciphers is now parsed by gnutls_priority_init(3) as a priority
866 string, documentation for which is at:
867 http://www.gnutls.org/manual/html_node/Priority-Strings.html
869 SNI support has been added to Exim's GnuTLS integration too.
871 For sufficiently recent GnuTLS libraries, ${randint:..} will now use
872 gnutls_rnd(), asking for GNUTLS_RND_NONCE level randomness.
874 12. With OpenSSL, if built with EXPERIMENTAL_OCSP, a new option tls_ocsp_file
875 is now available. If the contents of the file are valid, then Exim will
876 send that back in response to a TLS status request; this is OCSP Stapling.
877 Exim will not maintain the contents of the file in any way: administrators
878 are responsible for ensuring that it is up-to-date.
880 See "experimental-spec.txt" for more details.
882 13. ${lookup dnsdb{ }} supports now SPF record types. They are handled
883 identically to TXT record lookups.
885 14. New expansion variable $tod_epoch_l for higher-precision time.
887 15. New global option tls_dh_max_bits, defaulting to current value of NSS
888 hard-coded limit of DH ephemeral bits, to fix interop problems caused by
889 GnuTLS 2.12 library recommending a bit count higher than NSS supports.
891 16. tls_dhparam now used by both OpenSSL and GnuTLS, can be path or identifier.
892 Option can now be a path or an identifier for a standard prime.
893 If unset, we use the DH prime from section 2.2 of RFC 5114, "ike23".
894 Set to "historic" to get the old GnuTLS behaviour of auto-generated DH
897 17. SSLv2 now disabled by default in OpenSSL. (Never supported by GnuTLS).
898 Use "openssl_options -no_sslv2" to re-enable support, if your OpenSSL
899 install was not built with OPENSSL_NO_SSL2 ("no-ssl2").
905 1. New options for the ratelimit ACL condition: /count= and /unique=.
906 The /noupdate option has been replaced by a /readonly option.
908 2. The SMTP transport's protocol option may now be set to "smtps", to
909 use SSL-on-connect outbound.
911 3. New variable $av_failed, set true if the AV scanner deferred; ie, when
912 there is a problem talking to the AV scanner, or the AV scanner running.
914 4. New expansion conditions, "inlist" and "inlisti", which take simple lists
915 and check if the search item is a member of the list. This does not
916 support named lists, but does subject the list part to string expansion.
918 5. Unless the new EXPAND_LISTMATCH_RHS build option is set when Exim was
919 built, Exim no longer performs string expansion on the second string of
920 the match_* expansion conditions: "match_address", "match_domain",
921 "match_ip" & "match_local_part". Named lists can still be used.
927 1. The global option "dns_use_edns0" may be set to coerce EDNS0 usage on
928 or off in the resolver library.
934 1. In addition to the existing LDAP and LDAP/SSL ("ldaps") support, there
935 is now LDAP/TLS support, given sufficiently modern OpenLDAP client
936 libraries. The following global options have been added in support of
937 this: ldap_ca_cert_dir, ldap_ca_cert_file, ldap_cert_file, ldap_cert_key,
938 ldap_cipher_suite, ldap_require_cert, ldap_start_tls.
940 2. The pipe transport now takes a boolean option, "freeze_signal", default
941 false. When true, if the external delivery command exits on a signal then
942 Exim will freeze the message in the queue, instead of generating a bounce.
944 3. Log filenames may now use %M as an escape, instead of %D (still available).
945 The %M pattern expands to yyyymm, providing month-level resolution.
947 4. The $message_linecount variable is now updated for the maildir_tag option,
948 in the same way as $message_size, to reflect the real number of lines,
949 including any header additions or removals from transport.
951 5. When contacting a pool of SpamAssassin servers configured in spamd_address,
952 Exim now selects entries randomly, to better scale in a cluster setup.
958 1. SECURITY FIX: privilege escalation flaw fixed. On Linux (and only Linux)
959 the flaw permitted the Exim run-time user to cause root to append to
960 arbitrary files of the attacker's choosing, with the content based
961 on content supplied by the attacker.
963 2. Exim now supports loading some lookup types at run-time, using your
964 platform's dlopen() functionality. This has limited platform support
965 and the intention is not to support every variant, it's limited to
966 dlopen(). This permits the main Exim binary to not be linked against
967 all the libraries needed for all the lookup types.
973 NOTE: this version is not guaranteed backwards-compatible, please read the
974 items below carefully
976 1. A new main configuration option, "openssl_options", is available if Exim
977 is built with SSL support provided by OpenSSL. The option allows
978 administrators to specify OpenSSL options to be used on connections;
979 typically this is to set bug compatibility features which the OpenSSL
980 developers have not enabled by default. There may be security
981 consequences for certain options, so these should not be changed
984 2. A new pipe transport option, "permit_coredumps", may help with problem
985 diagnosis in some scenarios. Note that Exim is typically installed as
986 a setuid binary, which on most OSes will inhibit coredumps by default,
987 so that safety mechanism would have to be overridden for this option to
988 be able to take effect.
990 3. ClamAV 0.95 is now required for ClamAV support in Exim, unless
991 Local/Makefile sets: WITH_OLD_CLAMAV_STREAM=yes
992 Note that this switches Exim to use a new API ("INSTREAM") and a future
993 release of ClamAV will remove support for the old API ("STREAM").
995 The av_scanner option, when set to "clamd", now takes an optional third
996 part, "local", which causes Exim to pass a filename to ClamAV instead of
997 the file content. This is the same behaviour as when clamd is pointed at
998 a Unix-domain socket. For example:
1000 av_scanner = clamd:192.0.2.3 1234:local
1002 ClamAV's ExtendedDetectionInfo response format is now handled.
1004 4. There is now a -bmalware option, restricted to admin users. This option
1005 takes one parameter, a filename, and scans that file with Exim's
1006 malware-scanning framework. This is intended purely as a debugging aid
1007 to ensure that Exim's scanning is working, not to replace other tools.
1008 Note that the ACL framework is not invoked, so if av_scanner references
1009 ACL variables without a fallback then this will fail.
1011 5. There is a new expansion operator, "reverse_ip", which will reverse IP
1012 addresses; IPv4 into dotted quad, IPv6 into dotted nibble. Examples:
1014 ${reverse_ip:192.0.2.4}
1016 ${reverse_ip:2001:0db8:c42:9:1:abcd:192.0.2.3}
1017 -> 3.0.2.0.0.0.0.c.d.c.b.a.1.0.0.0.9.0.0.0.2.4.c.0.8.b.d.0.1.0.0.2
1019 6. There is a new ACL control called "debug", to enable debug logging.
1020 This allows selective logging of certain incoming transactions within
1021 production environments, with some care. It takes two options, "tag"
1022 and "opts"; "tag" is included in the filename of the log and "opts"
1023 is used as per the -d<options> command-line option. Examples, which
1024 don't all make sense in all contexts:
1027 control = debug/tag=.$sender_host_address
1028 control = debug/opts=+expand+acl
1029 control = debug/tag=.$message_exim_id/opts=+expand
1031 7. It has always been implicit in the design and the documentation that
1032 "the Exim user" is not root. src/EDITME said that using root was
1033 "very strongly discouraged". This is not enough to keep people from
1034 shooting themselves in the foot in days when many don't configure Exim
1035 themselves but via package build managers. The security consequences of
1036 running various bits of network code are severe if there should be bugs in
1037 them. As such, the Exim user may no longer be root. If configured
1038 statically, Exim will refuse to build. If configured as ref:user then Exim
1039 will exit shortly after start-up. If you must shoot yourself in the foot,
1040 then henceforth you will have to maintain your own local patches to strip
1043 8. There is a new expansion condition, bool_lax{}. Where bool{} uses the ACL
1044 condition logic to determine truth/failure and will fail to expand many
1045 strings, bool_lax{} uses the router condition logic, where most strings
1047 Note: bool{00} is false, bool_lax{00} is true.
1049 9. Routers now support multiple "condition" tests.
1051 10. There is now a runtime configuration option "tcp_wrappers_daemon_name".
1052 Setting this allows an admin to define which entry in the tcpwrappers
1053 config file will be used to control access to the daemon. This option
1054 is only available when Exim is built with USE_TCP_WRAPPERS. The
1055 default value is set at build time using the TCP_WRAPPERS_DAEMON_NAME
1058 11. [POSSIBLE CONFIG BREAKAGE] The default value for system_filter_user is now
1059 the Exim run-time user, instead of root.
1061 12. [POSSIBLE CONFIG BREAKAGE] ALT_CONFIG_ROOT_ONLY is no longer optional and
1062 is forced on. This is mitigated by the new build option
1063 TRUSTED_CONFIG_LIST which defines a list of configuration files which
1064 are trusted; one per line. If a config file is owned by root and matches
1065 a pathname in the list, then it may be invoked by the Exim build-time
1066 user without Exim relinquishing root privileges.
1068 13. [POSSIBLE CONFIG BREAKAGE] The Exim user is no longer automatically
1069 trusted to supply -D<Macro[=Value]> overrides on the command-line. Going
1070 forward, we recommend using TRUSTED_CONFIG_LIST with shim configs that
1071 include the main config. As a transition mechanism, we are temporarily
1072 providing a work-around: the new build option WHITELIST_D_MACROS provides
1073 a colon-separated list of macro names which may be overridden by the Exim
1074 run-time user. The values of these macros are constrained to the regex
1075 ^[A-Za-z0-9_/.-]*$ (which explicitly does allow for empty values).
1081 1. TWO SECURITY FIXES: one relating to mail-spools which are globally
1082 writable, the other to locking of MBX folders (not mbox).
1084 2. MySQL stored procedures are now supported.
1086 3. The dkim_domain transport option is now a list, not a single string, and
1087 messages will be signed for each element in the list (discarding
1090 4. The 4.70 release unexpectedly changed the behaviour of dnsdb TXT lookups
1091 in the presence of multiple character strings within the RR. Prior to 4.70,
1092 only the first string would be returned. The dnsdb lookup now, by default,
1093 preserves the pre-4.70 semantics, but also now takes an extended output
1094 separator specification. The separator can be followed by a semicolon, to
1095 concatenate the individual text strings together with no join character,
1096 or by a comma and a second separator character, in which case the text
1097 strings within a TXT record are joined on that second character.
1098 Administrators are reminded that DNS provides no ordering guarantees
1099 between multiple records in an RRset. For example:
1101 foo.example. IN TXT "a" "b" "c"
1102 foo.example. IN TXT "d" "e" "f"
1104 ${lookup dnsdb{>/ txt=foo.example}} -> "a/d"
1105 ${lookup dnsdb{>/; txt=foo.example}} -> "def/abc"
1106 ${lookup dnsdb{>/,+ txt=foo.example}} -> "a+b+c/d+e+f"
1112 1. Native DKIM support without an external library.
1113 (Note that if no action to prevent it is taken, a straight upgrade will
1114 result in DKIM verification of all signed incoming emails. See spec
1115 for details on conditionally disabling)
1117 2. Experimental DCC support via dccifd (contributed by Wolfgang Breyha).
1119 3. There is now a bool{} expansion condition which maps certain strings to
1120 true/false condition values (most likely of use in conjunction with the
1121 and{} expansion operator).
1123 4. The $spam_score, $spam_bar and $spam_report variables are now available
1126 5. exim -bP now supports "macros", "macro_list" or "macro MACRO_NAME" as
1127 options, provided that Exim is invoked by an admin_user.
1129 6. There is a new option gnutls_compat_mode, when linked against GnuTLS,
1130 which increases compatibility with older clients at the cost of decreased
1131 security. Don't set this unless you need to support such clients.
1133 7. There is a new expansion operator, ${randint:...} which will produce a
1134 "random" number less than the supplied integer. This randomness is
1135 not guaranteed to be cryptographically strong, but depending upon how
1136 Exim was built may be better than the most naive schemes.
1138 8. Exim now explicitly ensures that SHA256 is available when linked against
1141 9. The transport_filter_timeout option now applies to SMTP transports too.
1147 1. Preliminary DKIM support in Experimental.
1153 1. The body_linecount and body_zerocount C variables are now exported in the
1156 2. When a dnslists lookup succeeds, the key that was looked up is now placed
1157 in $dnslist_matched. When the key is an IP address, it is not reversed in
1158 this variable (though it is, of course, in the actual lookup). In simple
1161 deny dnslists = spamhaus.example
1163 the key is also available in another variable (in this case,
1164 $sender_host_address). In more complicated cases, however, this is not
1165 true. For example, using a data lookup might generate a dnslists lookup
1168 deny dnslists = spamhaus.example/<|192.168.1.2|192.168.6.7|...
1170 If this condition succeeds, the value in $dnslist_matched might be
1171 192.168.6.7 (for example).
1173 3. Authenticators now have a client_condition option. When Exim is running as
1174 a client, it skips an authenticator whose client_condition expansion yields
1175 "0", "no", or "false". This can be used, for example, to skip plain text
1176 authenticators when the connection is not encrypted by a setting such as:
1178 client_condition = ${if !eq{$tls_cipher}{}}
1180 Note that the 4.67 documentation states that $tls_cipher contains the
1181 cipher used for incoming messages. In fact, during SMTP delivery, it
1182 contains the cipher used for the delivery. The same is true for
1185 4. There is now a -Mvc <message-id> option, which outputs a copy of the
1186 message to the standard output, in RFC 2822 format. The option can be used
1187 only by an admin user.
1189 5. There is now a /noupdate option for the ratelimit ACL condition. It
1190 computes the rate and checks the limit as normal, but it does not update
1191 the saved data. This means that, in relevant ACLs, it is possible to lookup
1192 the existence of a specified (or auto-generated) ratelimit key without
1193 incrementing the ratelimit counter for that key.
1195 In order for this to be useful, another ACL entry must set the rate
1196 for the same key somewhere (otherwise it will always be zero).
1201 # Read the rate; if it doesn't exist or is below the maximum
1202 # we update it below
1203 deny ratelimit = 100 / 5m / strict / noupdate
1204 log_message = RATE: $sender_rate / $sender_rate_period \
1205 (max $sender_rate_limit)
1207 [... some other logic and tests...]
1209 warn ratelimit = 100 / 5m / strict / per_cmd
1210 log_message = RATE UPDATE: $sender_rate / $sender_rate_period \
1211 (max $sender_rate_limit)
1212 condition = ${if le{$sender_rate}{$sender_rate_limit}}
1216 6. The variable $max_received_linelength contains the number of bytes in the
1217 longest line that was received as part of the message, not counting the
1218 line termination character(s).
1220 7. Host lists can now include +ignore_defer and +include_defer, analogous to
1221 +ignore_unknown and +include_unknown. These options should be used with
1222 care, probably only in non-critical host lists such as whitelists.
1224 8. There's a new option called queue_only_load_latch, which defaults true.
1225 If set false when queue_only_load is greater than zero, Exim re-evaluates
1226 the load for each incoming message in an SMTP session. Otherwise, once one
1227 message is queued, the remainder are also.
1229 9. There is a new ACL, specified by acl_smtp_notquit, which is run in most
1230 cases when an SMTP session ends without sending QUIT. However, when Exim
1231 itself is in bad trouble, such as being unable to write to its log files,
1232 this ACL is not run, because it might try to do things (such as write to
1233 log files) that make the situation even worse.
1235 Like the QUIT ACL, this new ACL is provided to make it possible to gather
1236 statistics. Whatever it returns (accept or deny) is immaterial. The "delay"
1237 modifier is forbidden in this ACL.
1239 When the NOTQUIT ACL is running, the variable $smtp_notquit_reason is set
1240 to a string that indicates the reason for the termination of the SMTP
1241 connection. The possible values are:
1243 acl-drop Another ACL issued a "drop" command
1244 bad-commands Too many unknown or non-mail commands
1245 command-timeout Timeout while reading SMTP commands
1246 connection-lost The SMTP connection has been lost
1247 data-timeout Timeout while reading message data
1248 local-scan-error The local_scan() function crashed
1249 local-scan-timeout The local_scan() function timed out
1250 signal-exit SIGTERM or SIGINT
1251 synchronization-error SMTP synchronization error
1252 tls-failed TLS failed to start
1254 In most cases when an SMTP connection is closed without having received
1255 QUIT, Exim sends an SMTP response message before actually closing the
1256 connection. With the exception of acl-drop, the default message can be
1257 overridden by the "message" modifier in the NOTQUIT ACL. In the case of a
1258 "drop" verb in another ACL, it is the message from the other ACL that is
1261 10. For MySQL and PostgreSQL lookups, it is now possible to specify a list of
1262 servers with individual queries. This is done by starting the query with
1263 "servers=x:y:z;", where each item in the list may take one of two forms:
1265 (1) If it is just a host name, the appropriate global option (mysql_servers
1266 or pgsql_servers) is searched for a host of the same name, and the
1267 remaining parameters (database, user, password) are taken from there.
1269 (2) If it contains any slashes, it is taken as a complete parameter set.
1271 The list of servers is used in exactly the same was as the global list.
1272 Once a connection to a server has happened and a query has been
1273 successfully executed, processing of the lookup ceases.
1275 This feature is intended for use in master/slave situations where updates
1276 are occurring, and one wants to update a master rather than a slave. If the
1277 masters are in the list for reading, you might have:
1279 mysql_servers = slave1/db/name/pw:slave2/db/name/pw:master/db/name/pw
1281 In an updating lookup, you could then write
1283 ${lookup mysql{servers=master; UPDATE ...}
1285 If, on the other hand, the master is not to be used for reading lookups:
1287 pgsql_servers = slave1/db/name/pw:slave2/db/name/pw
1289 you can still update the master by
1291 ${lookup pgsql{servers=master/db/name/pw; UPDATE ...}
1293 11. The message_body_newlines option (default FALSE, for backwards
1294 compatibility) can be used to control whether newlines are present in
1295 $message_body and $message_body_end. If it is FALSE, they are replaced by
1302 1. There is a new log selector called smtp_no_mail, which is not included in
1303 the default setting. When it is set, a line is written to the main log
1304 whenever an accepted SMTP connection terminates without having issued a
1307 2. When an item in a dnslists list is followed by = and & and a list of IP
1308 addresses, the behaviour was not clear when the lookup returned more than
1309 one IP address. This has been solved by the addition of == and =& for "all"
1310 rather than the default "any" matching.
1312 3. Up till now, the only control over which cipher suites GnuTLS uses has been
1313 for the cipher algorithms. New options have been added to allow some of the
1314 other parameters to be varied.
1316 4. There is a new compile-time option called ENABLE_DISABLE_FSYNC. When it is
1317 set, Exim compiles a runtime option called disable_fsync.
1319 5. There is a new variable called $smtp_count_at_connection_start.
1321 6. There's a new control called no_pipelining.
1323 7. There are two new variables called $sending_ip_address and $sending_port.
1324 These are set whenever an SMTP connection to another host has been set up.
1326 8. The expansion of the helo_data option in the smtp transport now happens
1327 after the connection to the server has been made.
1329 9. There is a new expansion operator ${rfc2047d: that decodes strings that
1330 are encoded as per RFC 2047.
1332 10. There is a new log selector called "pid", which causes the current process
1333 id to be added to every log line, in square brackets, immediately after the
1336 11. Exim has been modified so that it flushes SMTP output before implementing
1337 a delay in an ACL. It also flushes the output before performing a callout,
1338 as this can take a substantial time. These behaviours can be disabled by
1339 obeying control = no_delay_flush or control = no_callout_flush,
1340 respectively, at some earlier stage of the connection.
1342 12. There are two new expansion conditions that iterate over a list. They are
1343 called forany and forall.
1345 13. There's a new global option called dsn_from that can be used to vary the
1346 contents of From: lines in bounces and other automatically generated
1347 messages ("delivery status notifications" - hence the name of the option).
1349 14. The smtp transport has a new option called hosts_avoid_pipelining.
1351 15. By default, exigrep does case-insensitive matches. There is now a -I option
1352 that makes it case-sensitive.
1354 16. A number of new features ("addresses", "map", "filter", and "reduce") have
1355 been added to string expansions to make it easier to process lists of
1356 items, typically addresses.
1358 17. There's a new ACL modifier called "continue". It does nothing of itself,
1359 and processing of the ACL always continues with the next condition or
1360 modifier. It is provided so that the side effects of expanding its argument
1363 18. It is now possible to use newline and other control characters (those with
1364 values less than 32, plus DEL) as separators in lists.
1366 19. The exigrep utility now has a -v option, which inverts the matching
1369 20. The host_find_failed option in the manualroute router can now be set to
1376 No new features were added to 4.66.
1382 No new features were added to 4.65.
1388 1. ACL variables can now be given arbitrary names, as long as they start with
1389 "acl_c" or "acl_m" (for connection variables and message variables), are at
1390 least six characters long, with the sixth character being either a digit or
1393 2. There is a new ACL modifier called log_reject_target. It makes it possible
1394 to specify which logs are used for messages about ACL rejections.
1396 3. There is a new authenticator called "dovecot". This is an interface to the
1397 authentication facility of the Dovecot POP/IMAP server, which can support a
1398 number of authentication methods.
1400 4. The variable $message_headers_raw provides a concatenation of all the
1401 messages's headers without any decoding. This is in contrast to
1402 $message_headers, which does RFC2047 decoding on the header contents.
1404 5. In a DNS black list, if two domain names, comma-separated, are given, the
1405 second is used first to do an initial check, making use of any IP value
1406 restrictions that are set. If there is a match, the first domain is used,
1407 without any IP value restrictions, to get the TXT record.
1409 6. All authenticators now have a server_condition option.
1411 7. There is a new command-line option called -Mset. It is useful only in
1412 conjunction with -be (that is, when testing string expansions). It must be
1413 followed by a message id; Exim loads the given message from its spool
1414 before doing the expansions.
1416 8. Another similar new command-line option is called -bem. It operates like
1417 -be except that it must be followed by the name of a file that contains a
1420 9. When an address is delayed because of a 4xx response to a RCPT command, it
1421 is now the combination of sender and recipient that is delayed in
1422 subsequent queue runs until its retry time is reached.
1424 10. Unary negation and the bitwise logical operators and, or, xor, not, and
1425 shift, have been added to the eval: and eval10: expansion items.
1427 11. The variables $interface_address and $interface_port have been renamed
1428 as $received_ip_address and $received_port, to make it clear that they
1429 relate to message reception rather than delivery. (The old names remain
1430 available for compatibility.)
1432 12. The "message" modifier can now be used on "accept" and "discard" acl verbs
1433 to vary the message that is sent when an SMTP command is accepted.
1439 1. There is a new Boolean option called filter_prepend_home for the redirect
1442 2. There is a new acl, set by acl_not_smtp_start, which is run right at the
1443 start of receiving a non-SMTP message, before any of the message has been
1446 3. When an SMTP error message is specified in a "message" modifier in an ACL,
1447 or in a :fail: or :defer: message in a redirect router, Exim now checks the
1448 start of the message for an SMTP error code.
1450 4. There is a new parameter for LDAP lookups called "referrals", which takes
1451 one of the settings "follow" (the default) or "nofollow".
1453 5. Version 20070721.2 of exipick now included, offering these new options:
1455 After all other sorting options have bee processed, reverse order
1456 before displaying messages (-R is synonym).
1458 Randomize order of matching messages before displaying.
1460 Instead of displaying the matching messages, display the sum
1462 --sort <variable>[,<variable>...]
1463 Before displaying matching messages, sort the messages according to
1464 each messages value for each variable.
1466 Negate the value for every test (returns inverse output from the
1467 same criteria without --not).
1473 1. The ${readsocket expansion item now supports Internet domain sockets as well
1474 as Unix domain sockets. If the first argument begins "inet:", it must be of
1475 the form "inet:host:port". The port is mandatory; it may be a number or the
1476 name of a TCP port in /etc/services. The host may be a name, or it may be an
1477 IP address. An ip address may optionally be enclosed in square brackets.
1478 This is best for IPv6 addresses. For example:
1480 ${readsocket{inet:[::1]:1234}{<request data>}...
1482 Only a single host name may be given, but if looking it up yield more than
1483 one IP address, they are each tried in turn until a connection is made. Once
1484 a connection has been made, the behaviour is as for ${readsocket with a Unix
1487 2. If a redirect router sets up file or pipe deliveries for more than one
1488 incoming address, and the relevant transport has batch_max set greater than
1489 one, a batch delivery now occurs.
1491 3. The appendfile transport has a new option called maildirfolder_create_regex.
1492 Its value is a regular expression. For a maildir delivery, this is matched
1493 against the maildir directory; if it matches, Exim ensures that a
1494 maildirfolder file is created alongside the new, cur, and tmp directories.
1500 The documentation is up-to-date for the 4.61 release. Major new features since
1501 the 4.60 release are:
1503 . An option called disable_ipv6, to disable the use of IPv6 completely.
1505 . An increase in the number of ACL variables to 20 of each type.
1507 . A change to use $auth1, $auth2, and $auth3 in authenticators instead of $1,
1508 $2, $3, (though those are still set) because the numeric variables get used
1509 for other things in complicated expansions.
1511 . The default for rfc1413_query_timeout has been changed from 30s to 5s.
1513 . It is possible to use setclassresources() on some BSD OS to control the
1514 resources used in pipe deliveries.
1516 . A new ACL modifier called add_header, which can be used with any verb.
1518 . More errors are detectable in retry rules.
1520 There are a number of other additions too.
1526 The documentation is up-to-date for the 4.60 release. Major new features since
1527 the 4.50 release are:
1529 . Support for SQLite.
1531 . Support for IGNOREQUOTA in LMTP.
1533 . Extensions to the "submission mode" features.
1535 . Support for Client SMTP Authorization (CSA).
1537 . Support for ratelimiting hosts and users.
1539 . New expansion items to help with the BATV "prvs" scheme.
1541 . A "match_ip" condition, that matches an IP address against a list.
1543 There are many more minor changes.