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
15 1. The dkim_status ACL condition may now be used in data ACLs
17 2. The dkim_verbose logging control also enables logging of signing
19 3. The dkim_timestamps signing option now accepts zero to include a current
20 timestamp but no expiry timestamp. Code by Simon Arlott; testsuite
23 4. The recipients_max main option is now expanded
25 5. Setting variables for "exim -be" can set a tainted value
29 7. The dsearch lookup supports search for a sub-path
31 8. Include mailtest utility for simple connection checking
33 9. Add SMTP WELLKNOWN extension
35 10. Sqlite3 can be used for the hints databases (vs. DBD, NDB, GBDM, TDB).
36 Add "USE_SQLITE = y" and "DBMLIB = -lsqlite3" in Local/Makefile, to
37 override the settings done in the OS/Makefile-<platform> file
42 1. The expansion-test facility (exim -be) can set variables.
44 2. An event on a failing SMTP AUTH, for both client and server operations.
46 3. Variable $sender_helo_verified with the result of an ACL "verify = helo".
48 4. Predefined macros for expansion items, operators, conditions and variables.
50 5. The smtp transport option "max_rcpt" is now expanded before use.
52 6. The tls_eccurve option for OpenSSL now takes a list of group names.
54 7. Queue runners for several queues can now be started from one daemon.
56 8. New utility exim_msgdate converts message-ids to human readable format.
58 9. An expansion operator for wrapping long header lines.
60 10. A commandline option to print just the message IDs of the queue
62 11. An option for the ${readsocket } expansion to set an SNI for TLS.
64 12. The ACL remove_header modifier can take a pattern.
66 13. Variable $recipients_list, a properly-quoted exim list.
68 14. A log_selector for an incoming connection ID.
73 1. A new ACL condition: seen. Records/tests a timestamp against a key.
75 2. A variant of the "mask" expansion operator to give normalised IPv6.
77 3. UTC output option for exim_dumpdb, exim_fixdb.
79 4. An event for failing TLS connects to the daemon.
81 5. The ACL "debug" control gains options "stop", "pretrigger" and "trigger".
83 6. Query-style lookups are now checked for quoting, if the query string is
84 built using untrusted data ("tainted"). For now lack of quoting is merely
85 logged; a future release will upgrade this to an error.
87 7. The expansion conditions match_<list-type> and inlist now set $value for
88 the expansion of the "true" result of the ${if}. With a static list, this
89 can be used for de-tainting.
91 8. Recipient verify callouts now set $domain_data & $local_part_data, with
97 1. The fast-ramp two phase queue run support, previously experimental, is
98 now supported by default.
100 2. The native SRS support, previously experimental, is now supported. It is
101 not built unless specified in the Local/Makefile.
103 3. TLS resumption support, previously experimental, is now supported and
104 included in default builds.
106 4. Single-key LMDB lookups, previously experimental, are now supported.
107 The support is not built unless specified in the Local/Makefile.
109 5. Option "message_linelength_limit" on the smtp transport to enforce (by
110 default) the RFC 998 character limit.
112 6. An option to ignore the cache on a lookup.
114 7. Quota checking during reception (i.e. at SMTP time) for appendfile-
115 transport-managed quotas.
117 8. Sqlite lookups accept a "file=<path>" option to specify a per-operation
118 db file, replacing the previous prefix to the SQL string (which had
119 issues when the SQL used tainted values).
121 9. Lsearch lookups accept a "ret=full" option, to return both the portion
122 of the line matching the key, and the remainder.
124 10. A command-line option to have a daemon not create a notifier socket.
126 11. Faster TLS startup. When various configuration options contain no
127 expandable elements, the information can be preloaded and cached rather
128 than the previous behaviour of always loading at startup time for every
129 connection. This helps particularly for the CA bundle.
131 12. Proxy Protocol Timeout is configurable via "proxy_protocol_timeout"
134 13. Option "smtp_accept_max_per_connection" is now expanded.
136 14. Log selector "queue_time_exclusive", enabled by default, to exclude the
137 time taken for reception from QT log elements.
139 15. Main option "smtp_backlog_monitor", to set a level above which listen
140 socket backlogs are logged.
142 16. Main option "hosts_require_helo", requiring HELO or EHLO before MAIL.
144 17. A main config option "allow_insecure_tainted_data" allows to turn
146 18. TLS ALPN handling. By default, refuse TLS connections that try to specify
147 a non-smtp (eg. http) use. Options for customising.
149 19. Support for MacOS (darwin) has been dropped.
155 1. EXPERIMENTAL_SRS_NATIVE optional build feature. See the experimental.spec
158 2. Channel-binding for authenticators is now supported under OpenSSL.
159 Previously it was GnuTLS-only.
161 3. A msg:defer event.
163 4. Client-side support in the gsasl authenticator. Tested against the
164 plaintext driver for PLAIN; only against itself for SCRAM-SHA-1 and
165 SCRAM-SHA-1-PLUS methods.
167 5. Server-side support in the gsasl authenticator for encrypted passwords, as
168 an alternate for the existing plaintext.
170 6. Variable $local_part_data now also set by router check_local_user option,
171 with an de-tainted version of $local_part.
173 7. Named-list definitions can now be prefixed "hide" so that "-bP" commands do
174 not output the content. Previously this could only be done on options.
176 8. As an experimental feature, the dovecot authentication driver supports inet
177 sockets. Previously it was unix-domain sockets only.
179 9. The ACL control "queue_only" can also be spelled "queue", and now takes an
180 option "first_pass_route" to do the same as a "-odqs" on the command line.
182 10. Items specified for the router and transport headers_remove option can use
183 a trailing asterisk to specify globbing.
185 11. New $queue_size variable.
187 12. New variables $local_part_{pre,suf}fix_v.
189 13. New main option "sqlite_dbfile", for use in preference to prefixing the
190 lookup string. The older method fails when tainted variables are used
191 in the lookup, as the filename becomes tainted. The new method keeps the
194 14. Options on the dsearch lookup, to return the full path and to filter
195 filetypes for matching.
197 15. Options on pgsql and mysql lookups, to specify server separate from the
200 16. An option on all single-key lookups, to return (on a hit) a de-tainted
201 version of the lookup key rather than the looked-up data.
203 17. $domain_data and $local_part_data are now set by all list-match successes.
204 Previously only list items that performed lookups did so.
205 Also, matching list items that are tail-match or RE-match now set the
206 numeric variables $0 (etc) in the same way os other RE matches.
208 18. Expansion item ${listquote {<char} {<item>}}.
210 19. An option for the ${readsocket {}{}{}} expansion to make the result data
213 20. dkim_verify_min_keysizes, a list of minimum acceptable public-key sizes.
215 21. bounce_message_file and warn_message_file are now expanded before use.
217 22. New main config option spf_smtp_comment_template to customise the
218 $spf_smtp_comment variable
225 1. An "external" authenticator, per RFC 4422 Appendix A.
227 2. A JSON lookup type, and JSON variants of the forall/any expansion conditions.
229 3. Variables $tls_in_cipher_std, $tls_out_cipher_std giving the RFC names
232 4. Log_selectors "msg_id" (on by default) and "msg_id_created".
234 5. A case_insensitive option for verify=not_blind.
236 6. EXPERIMENTAL_TLS_RESUME optional build feature. See the experimental.spec
239 7. A main option exim_version to override the version Exim
240 reports in verious places ($exim_version, $version_number).
242 8. Expansion operator ${sha2_N:} for N=256, 384, 512.
244 9. Router variables, $r_... settable from router options and usable in routers
247 10. The spf lookup now supports IPv6.
249 11. Main options for DKIM verify to filter hash and key types.
251 12. With TLS1.3, support for full-chain OCSP stapling.
253 13. Dual-certificate stacks on servers now support OCSP stapling, under OpenSSL.
255 14: An smtp:ehlo transport event, for observability of the remote offered features.
257 15: Support under OpenSSL for writing NSS-style key files for packet-capture
258 decode. The environment variable SSLKEYLOGFILE is used; if an absolute path
259 it must indicate a file under the spool directory; if relative the the spool
260 directory is prepended. Works on the server side only. Support under
261 GnuTLS was already there, being done purely by the library (server side
262 only, and exim must be run as root).
264 16: Command-line option to move messages from one named queue to another.
266 17. Variables $tls_in_ver, $tls_out_ver.
272 1. ${l_header:<name>} and ${l_h:<name>} expansion items, giving a colon-sep
273 list when there are multiple headers having a given name. This matters
274 when individual headers are wrapped onto multiple lines; with previous
275 facilities hard to parse.
277 2. The ${readsocket } expansion item now takes a "tls" option, doing the
280 3. EXPERIMENTAL_REQUIRETLS and EXPERIMENTAL_PIPE_CONNECT optional build
281 features. See the experimental.spec file.
283 4. If built with SUPPORT_I18N a "utf8_downconvert" option on the smtp transport.
285 5. A "pipelining" log_selector.
287 6. Builtin macros for supported log_selector and openssl_options values.
289 7. JSON variants of the ${extract } expansion item.
291 8. A "noutf8" debug option, for disabling the UTF-8 characters in debug output.
293 9. TCP Fast Open support on MacOS.
298 1. Dual-certificate stacks on servers now support OCSP stapling, under GnuTLS
299 version 3.5.6 or later.
301 2. DANE is now supported under GnuTLS version 3.0.0 or later. Both GnuTLS and
302 OpenSSL versions are moved to mainline support from Experimental.
303 New SMTP transport option "dane_require_tls_ciphers".
305 3. Feature macros for the compiled-in set of malware scanner interfaces.
307 4. SPF support is promoted from Experimental to mainline status. The template
308 src/EDITME makefile does not enable its inclusion.
310 5. Logging control for DKIM verification. The existing DKIM log line is
311 controlled by a "dkim_verbose" selector which is _not_ enabled by default.
312 A new tag "DKIM=<domain>" is added to <= lines by default, controlled by
313 a "dkim" log_selector.
315 6. Receive duration on <= lines, under a new log_selector "receive_time".
317 7. Options "ipv4_only" and "ipv4_prefer" on the dnslookup router and on
318 routing rules in the manualroute router.
320 8. Expansion item ${sha3:<string>} / ${sha3_<N>:<string>} now also supported
321 under OpenSSL version 1.1.1 or later.
323 9. DKIM operations can now use the Ed25519 algorithm in addition to RSA, under
324 GnuTLS 3.6.0 or OpenSSL 1.1.1 or later.
326 10. Builtin feature-macros _CRYPTO_HASH_SHA3 and _CRYPTO_SIGN_ED25519, library
329 11. "exim -bP macro <name>" returns caller-usable status.
331 12. Expansion item ${authresults {<machine>}} for creating an
332 Authentication-Results: header.
334 13. EXPERIMENTAL_ARC. See the experimental.spec file.
335 See also new util/renew-opendmarc-tlds.sh script for use with DMARC/ARC.
337 14: A dane:fail event, intended to facilitate reporting.
339 15. "Lightweight" support for Redis Cluster. Requires redis_servers list to
340 contain all the servers in the cluster, all of which must be reachable from
341 the running exim instance. If the cluster has master/slave replication, the
342 list must contain all the master and slave servers.
344 16. Add an option to the Avast scanner interface: "pass_unscanned". This
345 allows to treat unscanned files as clean. Files may be unscanned for
346 several reasons: decompression bombs, broken archives.
352 1. PKG_CONFIG_PATH can now be set in Local/Makefile;
353 wildcards will be expanded, values are collapsed.
355 2. The ${readsocket } expansion now takes an option to not shutdown the
356 connection after sending the query string. The default remains to do so.
358 3. An smtp transport option "hosts_noproxy_tls" to control whether multiple
359 deliveries on a single TCP connection can maintain a TLS connection
360 open. By default disabled for all hosts, doing so saves the cost of
361 making new TLS sessions, at the cost of having to proxy the data via
362 another process. Logging is also affected.
364 4. A malware connection type for the FPSCAND protocol.
366 5. An option for recipient verify callouts to hold the connection open for
367 further recipients and for delivery.
369 6. The reproducible build $SOURCE_DATE_EPOCH environment variable is now
372 7. Optionally, an alternate format for spool data-files which matches the
373 wire format - meaning more efficient reception and transmission (at the
374 cost of difficulty with standard Unix tools). Only used for messages
375 received using the ESMTP CHUNKING option, and when a new main-section
376 option "spool_wireformat" (false by default) is set.
378 8. New main configuration option "commandline_checks_require_admin" to
379 restrict who can use various introspection options.
381 9. New option modifier "no_check" for quota and quota_filecount
382 appendfile transport.
384 10. Variable $smtp_command_history returning a comma-sep list of recent
387 11. Millisecond timetamps in logs, on log_selector "millisec". Also affects
388 log elements QT, DT and D, and timstamps in debug output.
390 12. TCP Fast Open logging. As a server, logs when the SMTP banner was sent
391 while still in SYN_RECV state; as a client logs when the connection
392 is opened with a TFO cookie.
394 13. DKIM support for multiple signing, by domain and/or key-selector.
395 DKIM support for multiple hashes, and for alternate-identity tags.
396 Builtin macro with default list of signed headers.
397 Better syntax for specifying oversigning.
398 The DKIM ACL can override verification status, and status is visible in
401 14. Exipick understands -C|--config for an alternative Exim
404 15. TCP Fast Open used, with data-on-SYN, for client SMTP via SOCKS5 proxy,
405 for ${readsocket } expansions, and for ClamAV.
407 16. The "-be" expansion test mode now supports macros. Macros are expanded
408 in test lines, and new macros can be defined.
410 17. Support for server-side dual-certificate-stacks (eg. RSA + ECDSA).
416 1. Allow relative config file names for ".include"
418 2. A main-section config option "debug_store" to control the checks on
419 variable locations during store-reset. Normally false but can be enabled
420 when a memory corruption issue is suspected on a production system.
426 1. The new perl_taintmode option allows to run the embedded perl
427 interpreter in taint mode.
429 2. New log_selector: dnssec, adds a "DS" tag to acceptance and delivery lines.
431 3. Speculative debugging, via a "kill" option to the "control=debug" ACL
434 4. New expansion item ${sha3:<string>} / ${sha3_<N>:<string>}.
435 N can be 224, 256 (default), 384, 512.
436 With GnuTLS 3.5.0 or later, only.
438 5. Facility for named queues: A command-line argument can specify
439 the queue name for a queue operation, and an ACL modifier can set
440 the queue to be used for a message. A $queue_name variable gives
443 6. New expansion operators base32/base32d.
445 7. The CHUNKING ESMTP extension from RFC 3030. May give some slight
446 performance increase and network load decrease. Main config option
447 chunking_advertise_hosts, and smtp transport option hosts_try_chunking
450 8. LMDB lookup support, as Experimental. Patch supplied by Andrew Colin Kissa.
452 9. Expansion operator escape8bit, like escape but not touching newline etc..
454 10. Feature macros, generated from compile options. All start with "_HAVE_"
455 and go on with some roughly recognisable name. Driver macros, for
456 router, transport and authentication drivers; names starting with "_DRIVER_".
457 Option macros, for each configuration-file option; all start with "_OPT_".
458 Use the "-bP macros" command-line option to see what is present.
460 11. Integer values for options can take a "G" multiplier.
462 12. defer=pass option for the ACL control cutthrough_delivery, to reflect 4xx
463 returns from the target back to the initiator, rather than spooling the
466 13. New built-in constants available for tls_dhparam and default changed.
468 14. If built with EXPERIMENTAL_QUEUEFILE, a queuefile transport, for writing
469 out copies of the message spool files for use by 3rd-party scanners.
471 15. A new option on the smtp transport, hosts_try_fastopen. If the system
472 supports it (on Linux it must be enabled in the kernel by the sysadmin)
473 try to use RFC 7413 "TCP Fast Open". No data is sent on the SYN segment
474 but it permits a peer that also supports the facility to send its SMTP
475 banner immediately after the SYN,ACK segment rather then waiting for
476 another ACK - so saving up to one roundtrip time. Because it requires
477 previous communication with the peer (we save a cookie from it) this
478 will only become active on frequently-contacted destinations.
480 16. A new syslog_pid option to suppress PID duplication in syslog lines.
486 1. The ACL conditions regex and mime_regex now capture substrings
487 into numeric variables $regex1 to 9, like the "match" expansion condition.
489 2. New $callout_address variable records the address used for a spam=,
490 malware= or verify= callout.
492 3. Transports now take a "max_parallel" option, to limit concurrency.
494 4. Expansion operators ${ipv6norm:<string>} and ${ipv6denorm:<string>}.
495 The latter expands to a 8-element colon-sep set of hex digits including
496 leading zeroes. A trailing ipv4-style dotted-decimal set is converted
497 to hex. Pure ipv4 addresses are converted to IPv4-mapped IPv6.
498 The former operator strips leading zeroes and collapses the longest
499 set of 0-groups to a double-colon.
501 5. New "-bP config" support, to dump the effective configuration.
503 6. New $dkim_key_length variable.
505 7. New base64d and base64 expansion items (the existing str2b64 being a
506 synonym of the latter). Add support in base64 for certificates.
508 8. New main configuration option "bounce_return_linesize_limit" to
509 avoid oversize bodies in bounces. The default value matches RFC
512 9. New $initial_cwd expansion variable.
518 1. Support for using the system standard CA bundle.
520 2. New expansion items $config_file, $config_dir, containing the file
521 and directory name of the main configuration file. Also $exim_version.
523 3. New "malware=" support for Avast.
525 4. New "spam=" variant option for Rspamd.
527 5. Assorted options on malware= and spam= scanners.
529 6. A command-line option to write a comment into the logfile.
531 7. If built with EXPERIMENTAL_SOCKS feature enabled, the smtp transport can
532 be configured to make connections via socks5 proxies.
534 8. If built with EXPERIMENTAL_INTERNATIONAL, support is included for
535 the transmission of UTF-8 envelope addresses.
537 9. If built with EXPERIMENTAL_INTERNATIONAL, an expansion item for a commonly
538 used encoding of Maildir folder names.
540 10. A logging option for slow DNS lookups.
542 11. New ${env {<variable>}} expansion.
544 12. A non-SMTP authenticator using information from TLS client certificates.
546 13. Main option "tls_eccurve" for selecting an Elliptic Curve for TLS.
547 Patch originally by Wolfgang Breyha.
549 14. Main option "dns_trust_aa" for trusting your local nameserver at the
550 same level as DNSSEC.
555 1. If built with EXPERIMENTAL_DANE feature enabled, Exim will follow the
556 DANE SMTP draft to assess a secure chain of trust of the certificate
557 used to establish the TLS connection based on a TLSA record in the
558 domain of the sender.
560 2. The EXPERIMENTAL_TPDA feature has been renamed to EXPERIMENTAL_EVENT
561 and several new events have been created. The reason is because it has
562 been expanded beyond just firing events during the transport phase. Any
563 existing TPDA transport options will have to be rewritten to use a new
564 $event_name expansion variable in a condition. Refer to the
565 experimental-spec.txt for details and examples.
567 3. The EXPERIMENTAL_CERTNAMES features is an enhancement to verify that
568 server certs used for TLS match the result of the MX lookup. It does
569 not use the same mechanism as DANE.
579 1. If built with the EXPERIMENTAL_PROXY feature enabled, Exim can be
580 configured to expect an initial header from a proxy that will make the
581 actual external source IP:host be used in exim instead of the IP of the
582 proxy that is connecting to it.
584 2. New verify option header_names_ascii, which will check to make sure
585 there are no non-ASCII characters in header names. Exim itself handles
586 those non-ASCII characters, but downstream apps may not, so Exim can
587 detect and reject if those characters are present.
589 3. New expansion operator ${utf8clean:string} to replace malformed UTF8
590 codepoints with valid ones.
592 4. New malware type "sock". Talks over a Unix or TCP socket, sending one
593 command line and matching a regex against the return data for trigger
594 and a second regex to extract malware_name. The mail spoolfile name can
595 be included in the command line.
597 5. The smtp transport now supports options "tls_verify_hosts" and
598 "tls_try_verify_hosts". If either is set the certificate verification
599 is split from the encryption operation. The default remains that a failed
600 verification cancels the encryption.
602 6. New SERVERS override of default ldap server list. In the ACLs, an ldap
603 lookup can now set a list of servers to use that is different from the
606 7. New command-line option -C for exiqgrep to specify alternate exim.conf
607 file when searching the queue.
609 8. OCSP now supports GnuTLS also, if you have version 3.1.3 or later of that.
611 9. Support for DNSSEC on outbound connections.
613 10. New variables "tls_(in,out)_(our,peer)cert" and expansion item
614 "certextract" to extract fields from them. Hash operators md5 and sha1
615 work over them for generating fingerprints, and a new sha256 operator
618 11. PRDR is now supported dy default.
620 12. OCSP stapling is now supported by default.
622 13. If built with the EXPERIMENTAL_DSN feature enabled, Exim will output
623 Delivery Status Notification messages in MIME format, and negotiate
624 DSN features per RFC 3461.
630 1. New command-line option -bI:sieve will list all supported sieve extensions
631 of this Exim build on standard output, one per line.
632 ManageSieve (RFC 5804) providers managing scripts for use by Exim should
633 query this to establish the correct list to include in the protocol's
634 SIEVE capability line.
636 2. If the -n option is combined with the -bP option, then the name of an
637 emitted option is not output, only the value (if visible to you).
638 For instance, "exim -n -bP pid_file_path" should just emit a pathname
639 followed by a newline, and no other text.
641 3. When built with SUPPORT_TLS and USE_GNUTLS, the SMTP transport driver now
642 has a "tls_dh_min_bits" option, to set the minimum acceptable number of
643 bits in the Diffie-Hellman prime offered by a server (in DH ciphersuites)
644 acceptable for security. (Option accepted but ignored if using OpenSSL).
645 Defaults to 1024, the old value. May be lowered only to 512, or raised as
646 far as you like. Raising this may hinder TLS interoperability with other
647 sites and is not currently recommended. Lowering this will permit you to
648 establish a TLS session which is not as secure as you might like.
650 Unless you really know what you are doing, leave it alone.
652 4. If not built with DISABLE_DNSSEC, Exim now has the main option
653 dns_dnssec_ok; if set to 1 then Exim will initialise the resolver library
654 to send the DO flag to your recursive resolver. If you have a recursive
655 resolver, which can set the Authenticated Data (AD) flag in results, Exim
656 can now detect this. Exim does not perform validation itself, instead
657 relying upon a trusted path to the resolver.
659 Current status: work-in-progress; $sender_host_dnssec variable added.
661 5. DSCP support for outbound connections: on a transport using the smtp driver,
662 set "dscp = ef", for instance, to cause the connections to have the relevant
663 DSCP (IPv4 TOS or IPv6 TCLASS) value in the header.
665 Similarly for inbound connections, there is a new control modifier, dscp,
666 so "warn control = dscp/ef" in the connect ACL, or after authentication.
668 Supported values depend upon system libraries. "exim -bI:dscp" to list the
669 ones Exim knows of. You can also set a raw number 0..0x3F.
671 6. The -G command-line flag is no longer ignored; it is now equivalent to an
672 ACL setting "control = suppress_local_fixups". The -L command-line flag
673 is now accepted and forces use of syslog, with the provided tag as the
674 process name. A few other flags used by Sendmail are now accepted and
677 7. New cutthrough routing feature. Requested by a "control = cutthrough_delivery"
678 ACL modifier; works for single-recipient mails which are received on and
679 deliverable via SMTP. Using the connection made for a recipient verify,
680 if requested before the verify, or a new one made for the purpose while
681 the inbound connection is still active. The bulk of the mail item is copied
682 direct from the inbound socket to the outbound (as well as the spool file).
683 When the source notifies the end of data, the data acceptance by the destination
684 is negotiated before the acceptance is sent to the source. If the destination
685 does not accept the mail item, for example due to content-scanning, the item
686 is not accepted from the source and therefore there is no need to generate
687 a bounce mail. This is of benefit when providing a secondary-MX service.
688 The downside is that delays are under the control of the ultimate destination
691 The Received-by: header on items delivered by cutthrough is generated
692 early in reception rather than at the end; this will affect any timestamp
693 included. The log line showing delivery is recorded before that showing
694 reception; it uses a new ">>" tag instead of "=>".
696 To support the feature, verify-callout connections can now use ESMTP and TLS.
697 The usual smtp transport options are honoured, plus a (new, default everything)
698 hosts_verify_avoid_tls.
700 New variable families named tls_in_cipher, tls_out_cipher etc. are introduced
701 for specific access to the information for each connection. The old names
702 are present for now but deprecated.
704 Not yet supported: IGNOREQUOTA, SIZE, PIPELINING.
706 8. New expansion operators ${listnamed:name} to get the content of a named list
707 and ${listcount:string} to count the items in a list.
709 9. New global option "gnutls_allow_auto_pkcs11", defaults false. The GnuTLS
710 rewrite in 4.80 combines with GnuTLS 2.12.0 or later, to autoload PKCS11
711 modules. For some situations this is desirable, but we expect admin in
712 those situations to know they want the feature. More commonly, it means
713 that GUI user modules get loaded and are broken by the setuid Exim being
714 unable to access files specified in environment variables and passed
715 through, thus breakage. So we explicitly inhibit the PKCS11 initialisation
716 unless this new option is set.
718 Some older OS's with earlier versions of GnuTLS might not have pkcs11 ability,
719 so have also added a build option which can be used to build Exim with GnuTLS
720 but without trying to use any kind of PKCS11 support. Uncomment this in the
723 AVOID_GNUTLS_PKCS11=yes
725 10. The "acl = name" condition on an ACL now supports optional arguments.
726 New expansion item "${acl {name}{arg}...}" and expansion condition
727 "acl {{name}{arg}...}" are added. In all cases up to nine arguments
728 can be used, appearing in $acl_arg1 to $acl_arg9 for the called ACL.
729 Variable $acl_narg contains the number of arguments. If the ACL sets
730 a "message =" value this becomes the result of the expansion item,
731 or the value of $value for the expansion condition. If the ACL returns
732 accept the expansion condition is true; if reject, false. A defer
733 return results in a forced fail.
735 11. Routers and transports can now have multiple headers_add and headers_remove
736 option lines. The concatenated list is used.
738 12. New ACL modifier "remove_header" can remove headers before message gets
739 handled by routers/transports.
741 13. New dnsdb lookup pseudo-type "a+". A sequence of "a6" (if configured),
742 "aaaa" and "a" lookups is done and the full set of results returned.
744 14. New expansion variable $headers_added with content from ACL add_header
745 modifier (but not yet added to message).
747 15. New 8bitmime status logging option for received messages. Log field "M8S".
749 16. New authenticated_sender logging option, adding to log field "A".
751 17. New expansion variables $router_name and $transport_name. Useful
752 particularly for debug_print as -bt command-line option does not
753 require privilege whereas -d does.
755 18. If built with EXPERIMENTAL_PRDR, per-recipient data responses per a
756 proposed extension to SMTP from Eric Hall.
758 19. The pipe transport has gained the force_command option, to allow
759 decorating commands from user .forward pipe aliases with prefix
760 wrappers, for instance.
762 20. Callout connections can now AUTH; the same controls as normal delivery
765 21. Support for DMARC, using opendmarc libs, can be enabled. It adds new
766 options: dmarc_forensic_sender, dmarc_history_file, and dmarc_tld_file.
767 It adds new expansion variables $dmarc_ar_header, $dmarc_status,
768 $dmarc_status_text, and $dmarc_used_domain. It adds a new acl modifier
769 dmarc_status. It adds new control flags dmarc_disable_verify and
770 dmarc_enable_forensic. The default for the dmarc_tld_file option is
771 "/etc/exim/opendmarc.tlds" and can be changed via EDITME.
773 22. Add expansion variable $authenticated_fail_id, which is the username
774 provided to the authentication method which failed. It is available
775 for use in subsequent ACL processing (typically quit or notquit ACLs).
777 23. New ACL modifier "udpsend" can construct a UDP packet to send to a given
780 24. New ${hexquote:..string..} expansion operator converts non-printable
781 characters in the string to \xNN form.
783 25. Experimental TPDA (Transport Post Delivery Action) function added.
784 Patch provided by Axel Rau.
786 26. Experimental Redis lookup added. Patch provided by Warren Baker.
792 1. New authenticator driver, "gsasl". Server-only (at present).
793 This is a SASL interface, licensed under GPL, which can be found at
794 http://www.gnu.org/software/gsasl/.
795 This system does not provide sources of data for authentication, so
796 careful use needs to be made of the conditions in Exim.
798 2. New authenticator driver, "heimdal_gssapi". Server-only.
799 A replacement for using cyrus_sasl with Heimdal, now that $KRB5_KTNAME
800 is no longer honoured for setuid programs by Heimdal. Use the
801 "server_keytab" option to point to the keytab.
803 3. The "pkg-config" system can now be used when building Exim to reference
804 cflags and library information for lookups and authenticators, rather
805 than having to update "CFLAGS", "AUTH_LIBS", "LOOKUP_INCLUDE" and
806 "LOOKUP_LIBS" directly. Similarly for handling the TLS library support
807 without adjusting "TLS_INCLUDE" and "TLS_LIBS".
809 In addition, setting PCRE_CONFIG=yes will query the pcre-config tool to
810 find the headers and libraries for PCRE.
812 4. New expansion variable $tls_bits.
814 5. New lookup type, "dbmjz". Key is an Exim list, the elements of which will
815 be joined together with ASCII NUL characters to construct the key to pass
816 into the DBM library. Can be used with gsasl to access sasldb2 files as
819 6. OpenSSL now supports TLS1.1 and TLS1.2 with OpenSSL 1.0.1.
821 Avoid release 1.0.1a if you can. Note that the default value of
822 "openssl_options" is no longer "+dont_insert_empty_fragments", as that
823 increased susceptibility to attack. This may still have interoperability
824 implications for very old clients (see version 4.31 change 37) but
825 administrators can choose to make the trade-off themselves and restore
826 compatibility at the cost of session security.
828 7. Use of the new expansion variable $tls_sni in the main configuration option
829 tls_certificate will cause Exim to re-expand the option, if the client
830 sends the TLS Server Name Indication extension, to permit choosing a
831 different certificate; tls_privatekey will also be re-expanded. You must
832 still set these options to expand to valid files when $tls_sni is not set.
834 The SMTP Transport has gained the option tls_sni, which will set a hostname
835 for outbound TLS sessions, and set $tls_sni too.
837 A new log_selector, +tls_sni, has been added, to log received SNI values
838 for Exim as a server.
840 8. The existing "accept_8bitmime" option now defaults to true. This means
841 that Exim is deliberately not strictly RFC compliant. We're following
842 Dan Bernstein's advice in http://cr.yp.to/smtp/8bitmime.html by default.
843 Those who disagree, or know that they are talking to mail servers that,
844 even today, are not 8-bit clean, need to turn off this option.
846 9. Exim can now be started with -bw (with an optional timeout, given as
847 -bw<timespec>). With this, stdin at startup is a socket that is
848 already listening for connections. This has a more modern name of
849 "socket activation", but forcing the activated socket to fd 0. We're
850 interested in adding more support for modern variants.
852 10. ${eval } now uses 64-bit values on supporting platforms. A new "G" suffix
853 for numbers indicates multiplication by 1024^3.
855 11. The GnuTLS support has been revamped; the three options gnutls_require_kx,
856 gnutls_require_mac & gnutls_require_protocols are no longer supported.
857 tls_require_ciphers is now parsed by gnutls_priority_init(3) as a priority
858 string, documentation for which is at:
859 http://www.gnutls.org/manual/html_node/Priority-Strings.html
861 SNI support has been added to Exim's GnuTLS integration too.
863 For sufficiently recent GnuTLS libraries, ${randint:..} will now use
864 gnutls_rnd(), asking for GNUTLS_RND_NONCE level randomness.
866 12. With OpenSSL, if built with EXPERIMENTAL_OCSP, a new option tls_ocsp_file
867 is now available. If the contents of the file are valid, then Exim will
868 send that back in response to a TLS status request; this is OCSP Stapling.
869 Exim will not maintain the contents of the file in any way: administrators
870 are responsible for ensuring that it is up-to-date.
872 See "experimental-spec.txt" for more details.
874 13. ${lookup dnsdb{ }} supports now SPF record types. They are handled
875 identically to TXT record lookups.
877 14. New expansion variable $tod_epoch_l for higher-precision time.
879 15. New global option tls_dh_max_bits, defaulting to current value of NSS
880 hard-coded limit of DH ephemeral bits, to fix interop problems caused by
881 GnuTLS 2.12 library recommending a bit count higher than NSS supports.
883 16. tls_dhparam now used by both OpenSSL and GnuTLS, can be path or identifier.
884 Option can now be a path or an identifier for a standard prime.
885 If unset, we use the DH prime from section 2.2 of RFC 5114, "ike23".
886 Set to "historic" to get the old GnuTLS behaviour of auto-generated DH
889 17. SSLv2 now disabled by default in OpenSSL. (Never supported by GnuTLS).
890 Use "openssl_options -no_sslv2" to re-enable support, if your OpenSSL
891 install was not built with OPENSSL_NO_SSL2 ("no-ssl2").
897 1. New options for the ratelimit ACL condition: /count= and /unique=.
898 The /noupdate option has been replaced by a /readonly option.
900 2. The SMTP transport's protocol option may now be set to "smtps", to
901 use SSL-on-connect outbound.
903 3. New variable $av_failed, set true if the AV scanner deferred; ie, when
904 there is a problem talking to the AV scanner, or the AV scanner running.
906 4. New expansion conditions, "inlist" and "inlisti", which take simple lists
907 and check if the search item is a member of the list. This does not
908 support named lists, but does subject the list part to string expansion.
910 5. Unless the new EXPAND_LISTMATCH_RHS build option is set when Exim was
911 built, Exim no longer performs string expansion on the second string of
912 the match_* expansion conditions: "match_address", "match_domain",
913 "match_ip" & "match_local_part". Named lists can still be used.
919 1. The global option "dns_use_edns0" may be set to coerce EDNS0 usage on
920 or off in the resolver library.
926 1. In addition to the existing LDAP and LDAP/SSL ("ldaps") support, there
927 is now LDAP/TLS support, given sufficiently modern OpenLDAP client
928 libraries. The following global options have been added in support of
929 this: ldap_ca_cert_dir, ldap_ca_cert_file, ldap_cert_file, ldap_cert_key,
930 ldap_cipher_suite, ldap_require_cert, ldap_start_tls.
932 2. The pipe transport now takes a boolean option, "freeze_signal", default
933 false. When true, if the external delivery command exits on a signal then
934 Exim will freeze the message in the queue, instead of generating a bounce.
936 3. Log filenames may now use %M as an escape, instead of %D (still available).
937 The %M pattern expands to yyyymm, providing month-level resolution.
939 4. The $message_linecount variable is now updated for the maildir_tag option,
940 in the same way as $message_size, to reflect the real number of lines,
941 including any header additions or removals from transport.
943 5. When contacting a pool of SpamAssassin servers configured in spamd_address,
944 Exim now selects entries randomly, to better scale in a cluster setup.
950 1. SECURITY FIX: privilege escalation flaw fixed. On Linux (and only Linux)
951 the flaw permitted the Exim run-time user to cause root to append to
952 arbitrary files of the attacker's choosing, with the content based
953 on content supplied by the attacker.
955 2. Exim now supports loading some lookup types at run-time, using your
956 platform's dlopen() functionality. This has limited platform support
957 and the intention is not to support every variant, it's limited to
958 dlopen(). This permits the main Exim binary to not be linked against
959 all the libraries needed for all the lookup types.
965 NOTE: this version is not guaranteed backwards-compatible, please read the
966 items below carefully
968 1. A new main configuration option, "openssl_options", is available if Exim
969 is built with SSL support provided by OpenSSL. The option allows
970 administrators to specify OpenSSL options to be used on connections;
971 typically this is to set bug compatibility features which the OpenSSL
972 developers have not enabled by default. There may be security
973 consequences for certain options, so these should not be changed
976 2. A new pipe transport option, "permit_coredumps", may help with problem
977 diagnosis in some scenarios. Note that Exim is typically installed as
978 a setuid binary, which on most OSes will inhibit coredumps by default,
979 so that safety mechanism would have to be overridden for this option to
980 be able to take effect.
982 3. ClamAV 0.95 is now required for ClamAV support in Exim, unless
983 Local/Makefile sets: WITH_OLD_CLAMAV_STREAM=yes
984 Note that this switches Exim to use a new API ("INSTREAM") and a future
985 release of ClamAV will remove support for the old API ("STREAM").
987 The av_scanner option, when set to "clamd", now takes an optional third
988 part, "local", which causes Exim to pass a filename to ClamAV instead of
989 the file content. This is the same behaviour as when clamd is pointed at
990 a Unix-domain socket. For example:
992 av_scanner = clamd:192.0.2.3 1234:local
994 ClamAV's ExtendedDetectionInfo response format is now handled.
996 4. There is now a -bmalware option, restricted to admin users. This option
997 takes one parameter, a filename, and scans that file with Exim's
998 malware-scanning framework. This is intended purely as a debugging aid
999 to ensure that Exim's scanning is working, not to replace other tools.
1000 Note that the ACL framework is not invoked, so if av_scanner references
1001 ACL variables without a fallback then this will fail.
1003 5. There is a new expansion operator, "reverse_ip", which will reverse IP
1004 addresses; IPv4 into dotted quad, IPv6 into dotted nibble. Examples:
1006 ${reverse_ip:192.0.2.4}
1008 ${reverse_ip:2001:0db8:c42:9:1:abcd:192.0.2.3}
1009 -> 3.0.2.0.0.0.0.c.d.c.b.a.1.0.0.0.9.0.0.0.2.4.c.0.8.b.d.0.1.0.0.2
1011 6. There is a new ACL control called "debug", to enable debug logging.
1012 This allows selective logging of certain incoming transactions within
1013 production environments, with some care. It takes two options, "tag"
1014 and "opts"; "tag" is included in the filename of the log and "opts"
1015 is used as per the -d<options> command-line option. Examples, which
1016 don't all make sense in all contexts:
1019 control = debug/tag=.$sender_host_address
1020 control = debug/opts=+expand+acl
1021 control = debug/tag=.$message_exim_id/opts=+expand
1023 7. It has always been implicit in the design and the documentation that
1024 "the Exim user" is not root. src/EDITME said that using root was
1025 "very strongly discouraged". This is not enough to keep people from
1026 shooting themselves in the foot in days when many don't configure Exim
1027 themselves but via package build managers. The security consequences of
1028 running various bits of network code are severe if there should be bugs in
1029 them. As such, the Exim user may no longer be root. If configured
1030 statically, Exim will refuse to build. If configured as ref:user then Exim
1031 will exit shortly after start-up. If you must shoot yourself in the foot,
1032 then henceforth you will have to maintain your own local patches to strip
1035 8. There is a new expansion condition, bool_lax{}. Where bool{} uses the ACL
1036 condition logic to determine truth/failure and will fail to expand many
1037 strings, bool_lax{} uses the router condition logic, where most strings
1039 Note: bool{00} is false, bool_lax{00} is true.
1041 9. Routers now support multiple "condition" tests.
1043 10. There is now a runtime configuration option "tcp_wrappers_daemon_name".
1044 Setting this allows an admin to define which entry in the tcpwrappers
1045 config file will be used to control access to the daemon. This option
1046 is only available when Exim is built with USE_TCP_WRAPPERS. The
1047 default value is set at build time using the TCP_WRAPPERS_DAEMON_NAME
1050 11. [POSSIBLE CONFIG BREAKAGE] The default value for system_filter_user is now
1051 the Exim run-time user, instead of root.
1053 12. [POSSIBLE CONFIG BREAKAGE] ALT_CONFIG_ROOT_ONLY is no longer optional and
1054 is forced on. This is mitigated by the new build option
1055 TRUSTED_CONFIG_LIST which defines a list of configuration files which
1056 are trusted; one per line. If a config file is owned by root and matches
1057 a pathname in the list, then it may be invoked by the Exim build-time
1058 user without Exim relinquishing root privileges.
1060 13. [POSSIBLE CONFIG BREAKAGE] The Exim user is no longer automatically
1061 trusted to supply -D<Macro[=Value]> overrides on the command-line. Going
1062 forward, we recommend using TRUSTED_CONFIG_LIST with shim configs that
1063 include the main config. As a transition mechanism, we are temporarily
1064 providing a work-around: the new build option WHITELIST_D_MACROS provides
1065 a colon-separated list of macro names which may be overridden by the Exim
1066 run-time user. The values of these macros are constrained to the regex
1067 ^[A-Za-z0-9_/.-]*$ (which explicitly does allow for empty values).
1073 1. TWO SECURITY FIXES: one relating to mail-spools which are globally
1074 writable, the other to locking of MBX folders (not mbox).
1076 2. MySQL stored procedures are now supported.
1078 3. The dkim_domain transport option is now a list, not a single string, and
1079 messages will be signed for each element in the list (discarding
1082 4. The 4.70 release unexpectedly changed the behaviour of dnsdb TXT lookups
1083 in the presence of multiple character strings within the RR. Prior to 4.70,
1084 only the first string would be returned. The dnsdb lookup now, by default,
1085 preserves the pre-4.70 semantics, but also now takes an extended output
1086 separator specification. The separator can be followed by a semicolon, to
1087 concatenate the individual text strings together with no join character,
1088 or by a comma and a second separator character, in which case the text
1089 strings within a TXT record are joined on that second character.
1090 Administrators are reminded that DNS provides no ordering guarantees
1091 between multiple records in an RRset. For example:
1093 foo.example. IN TXT "a" "b" "c"
1094 foo.example. IN TXT "d" "e" "f"
1096 ${lookup dnsdb{>/ txt=foo.example}} -> "a/d"
1097 ${lookup dnsdb{>/; txt=foo.example}} -> "def/abc"
1098 ${lookup dnsdb{>/,+ txt=foo.example}} -> "a+b+c/d+e+f"
1104 1. Native DKIM support without an external library.
1105 (Note that if no action to prevent it is taken, a straight upgrade will
1106 result in DKIM verification of all signed incoming emails. See spec
1107 for details on conditionally disabling)
1109 2. Experimental DCC support via dccifd (contributed by Wolfgang Breyha).
1111 3. There is now a bool{} expansion condition which maps certain strings to
1112 true/false condition values (most likely of use in conjunction with the
1113 and{} expansion operator).
1115 4. The $spam_score, $spam_bar and $spam_report variables are now available
1118 5. exim -bP now supports "macros", "macro_list" or "macro MACRO_NAME" as
1119 options, provided that Exim is invoked by an admin_user.
1121 6. There is a new option gnutls_compat_mode, when linked against GnuTLS,
1122 which increases compatibility with older clients at the cost of decreased
1123 security. Don't set this unless you need to support such clients.
1125 7. There is a new expansion operator, ${randint:...} which will produce a
1126 "random" number less than the supplied integer. This randomness is
1127 not guaranteed to be cryptographically strong, but depending upon how
1128 Exim was built may be better than the most naive schemes.
1130 8. Exim now explicitly ensures that SHA256 is available when linked against
1133 9. The transport_filter_timeout option now applies to SMTP transports too.
1139 1. Preliminary DKIM support in Experimental.
1145 1. The body_linecount and body_zerocount C variables are now exported in the
1148 2. When a dnslists lookup succeeds, the key that was looked up is now placed
1149 in $dnslist_matched. When the key is an IP address, it is not reversed in
1150 this variable (though it is, of course, in the actual lookup). In simple
1153 deny dnslists = spamhaus.example
1155 the key is also available in another variable (in this case,
1156 $sender_host_address). In more complicated cases, however, this is not
1157 true. For example, using a data lookup might generate a dnslists lookup
1160 deny dnslists = spamhaus.example/<|192.168.1.2|192.168.6.7|...
1162 If this condition succeeds, the value in $dnslist_matched might be
1163 192.168.6.7 (for example).
1165 3. Authenticators now have a client_condition option. When Exim is running as
1166 a client, it skips an authenticator whose client_condition expansion yields
1167 "0", "no", or "false". This can be used, for example, to skip plain text
1168 authenticators when the connection is not encrypted by a setting such as:
1170 client_condition = ${if !eq{$tls_cipher}{}}
1172 Note that the 4.67 documentation states that $tls_cipher contains the
1173 cipher used for incoming messages. In fact, during SMTP delivery, it
1174 contains the cipher used for the delivery. The same is true for
1177 4. There is now a -Mvc <message-id> option, which outputs a copy of the
1178 message to the standard output, in RFC 2822 format. The option can be used
1179 only by an admin user.
1181 5. There is now a /noupdate option for the ratelimit ACL condition. It
1182 computes the rate and checks the limit as normal, but it does not update
1183 the saved data. This means that, in relevant ACLs, it is possible to lookup
1184 the existence of a specified (or auto-generated) ratelimit key without
1185 incrementing the ratelimit counter for that key.
1187 In order for this to be useful, another ACL entry must set the rate
1188 for the same key somewhere (otherwise it will always be zero).
1193 # Read the rate; if it doesn't exist or is below the maximum
1194 # we update it below
1195 deny ratelimit = 100 / 5m / strict / noupdate
1196 log_message = RATE: $sender_rate / $sender_rate_period \
1197 (max $sender_rate_limit)
1199 [... some other logic and tests...]
1201 warn ratelimit = 100 / 5m / strict / per_cmd
1202 log_message = RATE UPDATE: $sender_rate / $sender_rate_period \
1203 (max $sender_rate_limit)
1204 condition = ${if le{$sender_rate}{$sender_rate_limit}}
1208 6. The variable $max_received_linelength contains the number of bytes in the
1209 longest line that was received as part of the message, not counting the
1210 line termination character(s).
1212 7. Host lists can now include +ignore_defer and +include_defer, analogous to
1213 +ignore_unknown and +include_unknown. These options should be used with
1214 care, probably only in non-critical host lists such as whitelists.
1216 8. There's a new option called queue_only_load_latch, which defaults true.
1217 If set false when queue_only_load is greater than zero, Exim re-evaluates
1218 the load for each incoming message in an SMTP session. Otherwise, once one
1219 message is queued, the remainder are also.
1221 9. There is a new ACL, specified by acl_smtp_notquit, which is run in most
1222 cases when an SMTP session ends without sending QUIT. However, when Exim
1223 itself is in bad trouble, such as being unable to write to its log files,
1224 this ACL is not run, because it might try to do things (such as write to
1225 log files) that make the situation even worse.
1227 Like the QUIT ACL, this new ACL is provided to make it possible to gather
1228 statistics. Whatever it returns (accept or deny) is immaterial. The "delay"
1229 modifier is forbidden in this ACL.
1231 When the NOTQUIT ACL is running, the variable $smtp_notquit_reason is set
1232 to a string that indicates the reason for the termination of the SMTP
1233 connection. The possible values are:
1235 acl-drop Another ACL issued a "drop" command
1236 bad-commands Too many unknown or non-mail commands
1237 command-timeout Timeout while reading SMTP commands
1238 connection-lost The SMTP connection has been lost
1239 data-timeout Timeout while reading message data
1240 local-scan-error The local_scan() function crashed
1241 local-scan-timeout The local_scan() function timed out
1242 signal-exit SIGTERM or SIGINT
1243 synchronization-error SMTP synchronization error
1244 tls-failed TLS failed to start
1246 In most cases when an SMTP connection is closed without having received
1247 QUIT, Exim sends an SMTP response message before actually closing the
1248 connection. With the exception of acl-drop, the default message can be
1249 overridden by the "message" modifier in the NOTQUIT ACL. In the case of a
1250 "drop" verb in another ACL, it is the message from the other ACL that is
1253 10. For MySQL and PostgreSQL lookups, it is now possible to specify a list of
1254 servers with individual queries. This is done by starting the query with
1255 "servers=x:y:z;", where each item in the list may take one of two forms:
1257 (1) If it is just a host name, the appropriate global option (mysql_servers
1258 or pgsql_servers) is searched for a host of the same name, and the
1259 remaining parameters (database, user, password) are taken from there.
1261 (2) If it contains any slashes, it is taken as a complete parameter set.
1263 The list of servers is used in exactly the same was as the global list.
1264 Once a connection to a server has happened and a query has been
1265 successfully executed, processing of the lookup ceases.
1267 This feature is intended for use in master/slave situations where updates
1268 are occurring, and one wants to update a master rather than a slave. If the
1269 masters are in the list for reading, you might have:
1271 mysql_servers = slave1/db/name/pw:slave2/db/name/pw:master/db/name/pw
1273 In an updating lookup, you could then write
1275 ${lookup mysql{servers=master; UPDATE ...}
1277 If, on the other hand, the master is not to be used for reading lookups:
1279 pgsql_servers = slave1/db/name/pw:slave2/db/name/pw
1281 you can still update the master by
1283 ${lookup pgsql{servers=master/db/name/pw; UPDATE ...}
1285 11. The message_body_newlines option (default FALSE, for backwards
1286 compatibility) can be used to control whether newlines are present in
1287 $message_body and $message_body_end. If it is FALSE, they are replaced by
1294 1. There is a new log selector called smtp_no_mail, which is not included in
1295 the default setting. When it is set, a line is written to the main log
1296 whenever an accepted SMTP connection terminates without having issued a
1299 2. When an item in a dnslists list is followed by = and & and a list of IP
1300 addresses, the behaviour was not clear when the lookup returned more than
1301 one IP address. This has been solved by the addition of == and =& for "all"
1302 rather than the default "any" matching.
1304 3. Up till now, the only control over which cipher suites GnuTLS uses has been
1305 for the cipher algorithms. New options have been added to allow some of the
1306 other parameters to be varied.
1308 4. There is a new compile-time option called ENABLE_DISABLE_FSYNC. When it is
1309 set, Exim compiles a runtime option called disable_fsync.
1311 5. There is a new variable called $smtp_count_at_connection_start.
1313 6. There's a new control called no_pipelining.
1315 7. There are two new variables called $sending_ip_address and $sending_port.
1316 These are set whenever an SMTP connection to another host has been set up.
1318 8. The expansion of the helo_data option in the smtp transport now happens
1319 after the connection to the server has been made.
1321 9. There is a new expansion operator ${rfc2047d: that decodes strings that
1322 are encoded as per RFC 2047.
1324 10. There is a new log selector called "pid", which causes the current process
1325 id to be added to every log line, in square brackets, immediately after the
1328 11. Exim has been modified so that it flushes SMTP output before implementing
1329 a delay in an ACL. It also flushes the output before performing a callout,
1330 as this can take a substantial time. These behaviours can be disabled by
1331 obeying control = no_delay_flush or control = no_callout_flush,
1332 respectively, at some earlier stage of the connection.
1334 12. There are two new expansion conditions that iterate over a list. They are
1335 called forany and forall.
1337 13. There's a new global option called dsn_from that can be used to vary the
1338 contents of From: lines in bounces and other automatically generated
1339 messages ("delivery status notifications" - hence the name of the option).
1341 14. The smtp transport has a new option called hosts_avoid_pipelining.
1343 15. By default, exigrep does case-insensitive matches. There is now a -I option
1344 that makes it case-sensitive.
1346 16. A number of new features ("addresses", "map", "filter", and "reduce") have
1347 been added to string expansions to make it easier to process lists of
1348 items, typically addresses.
1350 17. There's a new ACL modifier called "continue". It does nothing of itself,
1351 and processing of the ACL always continues with the next condition or
1352 modifier. It is provided so that the side effects of expanding its argument
1355 18. It is now possible to use newline and other control characters (those with
1356 values less than 32, plus DEL) as separators in lists.
1358 19. The exigrep utility now has a -v option, which inverts the matching
1361 20. The host_find_failed option in the manualroute router can now be set to
1368 No new features were added to 4.66.
1374 No new features were added to 4.65.
1380 1. ACL variables can now be given arbitrary names, as long as they start with
1381 "acl_c" or "acl_m" (for connection variables and message variables), are at
1382 least six characters long, with the sixth character being either a digit or
1385 2. There is a new ACL modifier called log_reject_target. It makes it possible
1386 to specify which logs are used for messages about ACL rejections.
1388 3. There is a new authenticator called "dovecot". This is an interface to the
1389 authentication facility of the Dovecot POP/IMAP server, which can support a
1390 number of authentication methods.
1392 4. The variable $message_headers_raw provides a concatenation of all the
1393 messages's headers without any decoding. This is in contrast to
1394 $message_headers, which does RFC2047 decoding on the header contents.
1396 5. In a DNS black list, if two domain names, comma-separated, are given, the
1397 second is used first to do an initial check, making use of any IP value
1398 restrictions that are set. If there is a match, the first domain is used,
1399 without any IP value restrictions, to get the TXT record.
1401 6. All authenticators now have a server_condition option.
1403 7. There is a new command-line option called -Mset. It is useful only in
1404 conjunction with -be (that is, when testing string expansions). It must be
1405 followed by a message id; Exim loads the given message from its spool
1406 before doing the expansions.
1408 8. Another similar new command-line option is called -bem. It operates like
1409 -be except that it must be followed by the name of a file that contains a
1412 9. When an address is delayed because of a 4xx response to a RCPT command, it
1413 is now the combination of sender and recipient that is delayed in
1414 subsequent queue runs until its retry time is reached.
1416 10. Unary negation and the bitwise logical operators and, or, xor, not, and
1417 shift, have been added to the eval: and eval10: expansion items.
1419 11. The variables $interface_address and $interface_port have been renamed
1420 as $received_ip_address and $received_port, to make it clear that they
1421 relate to message reception rather than delivery. (The old names remain
1422 available for compatibility.)
1424 12. The "message" modifier can now be used on "accept" and "discard" acl verbs
1425 to vary the message that is sent when an SMTP command is accepted.
1431 1. There is a new Boolean option called filter_prepend_home for the redirect
1434 2. There is a new acl, set by acl_not_smtp_start, which is run right at the
1435 start of receiving a non-SMTP message, before any of the message has been
1438 3. When an SMTP error message is specified in a "message" modifier in an ACL,
1439 or in a :fail: or :defer: message in a redirect router, Exim now checks the
1440 start of the message for an SMTP error code.
1442 4. There is a new parameter for LDAP lookups called "referrals", which takes
1443 one of the settings "follow" (the default) or "nofollow".
1445 5. Version 20070721.2 of exipick now included, offering these new options:
1447 After all other sorting options have bee processed, reverse order
1448 before displaying messages (-R is synonym).
1450 Randomize order of matching messages before displaying.
1452 Instead of displaying the matching messages, display the sum
1454 --sort <variable>[,<variable>...]
1455 Before displaying matching messages, sort the messages according to
1456 each messages value for each variable.
1458 Negate the value for every test (returns inverse output from the
1459 same criteria without --not).
1465 1. The ${readsocket expansion item now supports Internet domain sockets as well
1466 as Unix domain sockets. If the first argument begins "inet:", it must be of
1467 the form "inet:host:port". The port is mandatory; it may be a number or the
1468 name of a TCP port in /etc/services. The host may be a name, or it may be an
1469 IP address. An ip address may optionally be enclosed in square brackets.
1470 This is best for IPv6 addresses. For example:
1472 ${readsocket{inet:[::1]:1234}{<request data>}...
1474 Only a single host name may be given, but if looking it up yield more than
1475 one IP address, they are each tried in turn until a connection is made. Once
1476 a connection has been made, the behaviour is as for ${readsocket with a Unix
1479 2. If a redirect router sets up file or pipe deliveries for more than one
1480 incoming address, and the relevant transport has batch_max set greater than
1481 one, a batch delivery now occurs.
1483 3. The appendfile transport has a new option called maildirfolder_create_regex.
1484 Its value is a regular expression. For a maildir delivery, this is matched
1485 against the maildir directory; if it matches, Exim ensures that a
1486 maildirfolder file is created alongside the new, cur, and tmp directories.
1492 The documentation is up-to-date for the 4.61 release. Major new features since
1493 the 4.60 release are:
1495 . An option called disable_ipv6, to disable the use of IPv6 completely.
1497 . An increase in the number of ACL variables to 20 of each type.
1499 . A change to use $auth1, $auth2, and $auth3 in authenticators instead of $1,
1500 $2, $3, (though those are still set) because the numeric variables get used
1501 for other things in complicated expansions.
1503 . The default for rfc1413_query_timeout has been changed from 30s to 5s.
1505 . It is possible to use setclassresources() on some BSD OS to control the
1506 resources used in pipe deliveries.
1508 . A new ACL modifier called add_header, which can be used with any verb.
1510 . More errors are detectable in retry rules.
1512 There are a number of other additions too.
1518 The documentation is up-to-date for the 4.60 release. Major new features since
1519 the 4.50 release are:
1521 . Support for SQLite.
1523 . Support for IGNOREQUOTA in LMTP.
1525 . Extensions to the "submission mode" features.
1527 . Support for Client SMTP Authorization (CSA).
1529 . Support for ratelimiting hosts and users.
1531 . New expansion items to help with the BATV "prvs" scheme.
1533 . A "match_ip" condition, that matches an IP address against a list.
1535 There are many more minor changes.