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. Support for Sieve filters can be omitted at build time
19 5. JSON and LDAP lookup support, Sieve, PAM, RADIUS, perl, SPF, DKIM, DMARC and
20 ARC support, all the router and authenticator drivers, and all the transport
21 drivers except smtp, can now be built as loadable modules
25 1. The dkim_status ACL condition may now be used in data ACLs
27 2. The dkim_verbose logging control also enables logging of signing
29 3. The dkim_timestamps signing option now accepts zero to include a current
30 timestamp but no expiry timestamp. Code by Simon Arlott; testsuite
33 4. The recipients_max main option is now expanded
35 5. Setting variables for "exim -be" can set a tainted value
39 7. The dsearch lookup supports search for a sub-path
41 8. Include mailtest utility for simple connection checking
43 9. Add SMTP WELLKNOWN extension
45 10. Sqlite3 can be used for the hints databases (vs. DBD, NDB, GBDM, TDB).
46 Add "USE_SQLITE = y" and "DBMLIB = -lsqlite3" in Local/Makefile, to
47 override the settings done in the OS/Makefile-<platform> file
52 1. The expansion-test facility (exim -be) can set variables.
54 2. An event on a failing SMTP AUTH, for both client and server operations.
56 3. Variable $sender_helo_verified with the result of an ACL "verify = helo".
58 4. Predefined macros for expansion items, operators, conditions and variables.
60 5. The smtp transport option "max_rcpt" is now expanded before use.
62 6. The tls_eccurve option for OpenSSL now takes a list of group names.
64 7. Queue runners for several queues can now be started from one daemon.
66 8. New utility exim_msgdate converts message-ids to human readable format.
68 9. An expansion operator for wrapping long header lines.
70 10. A commandline option to print just the message IDs of the queue
72 11. An option for the ${readsocket } expansion to set an SNI for TLS.
74 12. The ACL remove_header modifier can take a pattern.
76 13. Variable $recipients_list, a properly-quoted exim list.
78 14. A log_selector for an incoming connection ID.
83 1. A new ACL condition: seen. Records/tests a timestamp against a key.
85 2. A variant of the "mask" expansion operator to give normalised IPv6.
87 3. UTC output option for exim_dumpdb, exim_fixdb.
89 4. An event for failing TLS connects to the daemon.
91 5. The ACL "debug" control gains options "stop", "pretrigger" and "trigger".
93 6. Query-style lookups are now checked for quoting, if the query string is
94 built using untrusted data ("tainted"). For now lack of quoting is merely
95 logged; a future release will upgrade this to an error.
97 7. The expansion conditions match_<list-type> and inlist now set $value for
98 the expansion of the "true" result of the ${if}. With a static list, this
99 can be used for de-tainting.
101 8. Recipient verify callouts now set $domain_data & $local_part_data, with
107 1. The fast-ramp two phase queue run support, previously experimental, is
108 now supported by default.
110 2. The native SRS support, previously experimental, is now supported. It is
111 not built unless specified in the Local/Makefile.
113 3. TLS resumption support, previously experimental, is now supported and
114 included in default builds.
116 4. Single-key LMDB lookups, previously experimental, are now supported.
117 The support is not built unless specified in the Local/Makefile.
119 5. Option "message_linelength_limit" on the smtp transport to enforce (by
120 default) the RFC 998 character limit.
122 6. An option to ignore the cache on a lookup.
124 7. Quota checking during reception (i.e. at SMTP time) for appendfile-
125 transport-managed quotas.
127 8. Sqlite lookups accept a "file=<path>" option to specify a per-operation
128 db file, replacing the previous prefix to the SQL string (which had
129 issues when the SQL used tainted values).
131 9. Lsearch lookups accept a "ret=full" option, to return both the portion
132 of the line matching the key, and the remainder.
134 10. A command-line option to have a daemon not create a notifier socket.
136 11. Faster TLS startup. When various configuration options contain no
137 expandable elements, the information can be preloaded and cached rather
138 than the previous behaviour of always loading at startup time for every
139 connection. This helps particularly for the CA bundle.
141 12. Proxy Protocol Timeout is configurable via "proxy_protocol_timeout"
144 13. Option "smtp_accept_max_per_connection" is now expanded.
146 14. Log selector "queue_time_exclusive", enabled by default, to exclude the
147 time taken for reception from QT log elements.
149 15. Main option "smtp_backlog_monitor", to set a level above which listen
150 socket backlogs are logged.
152 16. Main option "hosts_require_helo", requiring HELO or EHLO before MAIL.
154 17. A main config option "allow_insecure_tainted_data" allows to turn
156 18. TLS ALPN handling. By default, refuse TLS connections that try to specify
157 a non-smtp (eg. http) use. Options for customising.
159 19. Support for MacOS (darwin) has been dropped.
165 1. EXPERIMENTAL_SRS_NATIVE optional build feature. See the experimental.spec
168 2. Channel-binding for authenticators is now supported under OpenSSL.
169 Previously it was GnuTLS-only.
171 3. A msg:defer event.
173 4. Client-side support in the gsasl authenticator. Tested against the
174 plaintext driver for PLAIN; only against itself for SCRAM-SHA-1 and
175 SCRAM-SHA-1-PLUS methods.
177 5. Server-side support in the gsasl authenticator for encrypted passwords, as
178 an alternate for the existing plaintext.
180 6. Variable $local_part_data now also set by router check_local_user option,
181 with an de-tainted version of $local_part.
183 7. Named-list definitions can now be prefixed "hide" so that "-bP" commands do
184 not output the content. Previously this could only be done on options.
186 8. As an experimental feature, the dovecot authentication driver supports inet
187 sockets. Previously it was unix-domain sockets only.
189 9. The ACL control "queue_only" can also be spelled "queue", and now takes an
190 option "first_pass_route" to do the same as a "-odqs" on the command line.
192 10. Items specified for the router and transport headers_remove option can use
193 a trailing asterisk to specify globbing.
195 11. New $queue_size variable.
197 12. New variables $local_part_{pre,suf}fix_v.
199 13. New main option "sqlite_dbfile", for use in preference to prefixing the
200 lookup string. The older method fails when tainted variables are used
201 in the lookup, as the filename becomes tainted. The new method keeps the
204 14. Options on the dsearch lookup, to return the full path and to filter
205 filetypes for matching.
207 15. Options on pgsql and mysql lookups, to specify server separate from the
210 16. An option on all single-key lookups, to return (on a hit) a de-tainted
211 version of the lookup key rather than the looked-up data.
213 17. $domain_data and $local_part_data are now set by all list-match successes.
214 Previously only list items that performed lookups did so.
215 Also, matching list items that are tail-match or RE-match now set the
216 numeric variables $0 (etc) in the same way os other RE matches.
218 18. Expansion item ${listquote {<char} {<item>}}.
220 19. An option for the ${readsocket {}{}{}} expansion to make the result data
223 20. dkim_verify_min_keysizes, a list of minimum acceptable public-key sizes.
225 21. bounce_message_file and warn_message_file are now expanded before use.
227 22. New main config option spf_smtp_comment_template to customise the
228 $spf_smtp_comment variable
235 1. An "external" authenticator, per RFC 4422 Appendix A.
237 2. A JSON lookup type, and JSON variants of the forall/any expansion conditions.
239 3. Variables $tls_in_cipher_std, $tls_out_cipher_std giving the RFC names
242 4. Log_selectors "msg_id" (on by default) and "msg_id_created".
244 5. A case_insensitive option for verify=not_blind.
246 6. EXPERIMENTAL_TLS_RESUME optional build feature. See the experimental.spec
249 7. A main option exim_version to override the version Exim
250 reports in verious places ($exim_version, $version_number).
252 8. Expansion operator ${sha2_N:} for N=256, 384, 512.
254 9. Router variables, $r_... settable from router options and usable in routers
257 10. The spf lookup now supports IPv6.
259 11. Main options for DKIM verify to filter hash and key types.
261 12. With TLS1.3, support for full-chain OCSP stapling.
263 13. Dual-certificate stacks on servers now support OCSP stapling, under OpenSSL.
265 14: An smtp:ehlo transport event, for observability of the remote offered features.
267 15: Support under OpenSSL for writing NSS-style key files for packet-capture
268 decode. The environment variable SSLKEYLOGFILE is used; if an absolute path
269 it must indicate a file under the spool directory; if relative the the spool
270 directory is prepended. Works on the server side only. Support under
271 GnuTLS was already there, being done purely by the library (server side
272 only, and exim must be run as root).
274 16: Command-line option to move messages from one named queue to another.
276 17. Variables $tls_in_ver, $tls_out_ver.
282 1. ${l_header:<name>} and ${l_h:<name>} expansion items, giving a colon-sep
283 list when there are multiple headers having a given name. This matters
284 when individual headers are wrapped onto multiple lines; with previous
285 facilities hard to parse.
287 2. The ${readsocket } expansion item now takes a "tls" option, doing the
290 3. EXPERIMENTAL_REQUIRETLS and EXPERIMENTAL_PIPE_CONNECT optional build
291 features. See the experimental.spec file.
293 4. If built with SUPPORT_I18N a "utf8_downconvert" option on the smtp transport.
295 5. A "pipelining" log_selector.
297 6. Builtin macros for supported log_selector and openssl_options values.
299 7. JSON variants of the ${extract } expansion item.
301 8. A "noutf8" debug option, for disabling the UTF-8 characters in debug output.
303 9. TCP Fast Open support on MacOS.
308 1. Dual-certificate stacks on servers now support OCSP stapling, under GnuTLS
309 version 3.5.6 or later.
311 2. DANE is now supported under GnuTLS version 3.0.0 or later. Both GnuTLS and
312 OpenSSL versions are moved to mainline support from Experimental.
313 New SMTP transport option "dane_require_tls_ciphers".
315 3. Feature macros for the compiled-in set of malware scanner interfaces.
317 4. SPF support is promoted from Experimental to mainline status. The template
318 src/EDITME makefile does not enable its inclusion.
320 5. Logging control for DKIM verification. The existing DKIM log line is
321 controlled by a "dkim_verbose" selector which is _not_ enabled by default.
322 A new tag "DKIM=<domain>" is added to <= lines by default, controlled by
323 a "dkim" log_selector.
325 6. Receive duration on <= lines, under a new log_selector "receive_time".
327 7. Options "ipv4_only" and "ipv4_prefer" on the dnslookup router and on
328 routing rules in the manualroute router.
330 8. Expansion item ${sha3:<string>} / ${sha3_<N>:<string>} now also supported
331 under OpenSSL version 1.1.1 or later.
333 9. DKIM operations can now use the Ed25519 algorithm in addition to RSA, under
334 GnuTLS 3.6.0 or OpenSSL 1.1.1 or later.
336 10. Builtin feature-macros _CRYPTO_HASH_SHA3 and _CRYPTO_SIGN_ED25519, library
339 11. "exim -bP macro <name>" returns caller-usable status.
341 12. Expansion item ${authresults {<machine>}} for creating an
342 Authentication-Results: header.
344 13. EXPERIMENTAL_ARC. See the experimental.spec file.
345 See also new util/renew-opendmarc-tlds.sh script for use with DMARC/ARC.
347 14: A dane:fail event, intended to facilitate reporting.
349 15. "Lightweight" support for Redis Cluster. Requires redis_servers list to
350 contain all the servers in the cluster, all of which must be reachable from
351 the running exim instance. If the cluster has master/slave replication, the
352 list must contain all the master and slave servers.
354 16. Add an option to the Avast scanner interface: "pass_unscanned". This
355 allows to treat unscanned files as clean. Files may be unscanned for
356 several reasons: decompression bombs, broken archives.
362 1. PKG_CONFIG_PATH can now be set in Local/Makefile;
363 wildcards will be expanded, values are collapsed.
365 2. The ${readsocket } expansion now takes an option to not shutdown the
366 connection after sending the query string. The default remains to do so.
368 3. An smtp transport option "hosts_noproxy_tls" to control whether multiple
369 deliveries on a single TCP connection can maintain a TLS connection
370 open. By default disabled for all hosts, doing so saves the cost of
371 making new TLS sessions, at the cost of having to proxy the data via
372 another process. Logging is also affected.
374 4. A malware connection type for the FPSCAND protocol.
376 5. An option for recipient verify callouts to hold the connection open for
377 further recipients and for delivery.
379 6. The reproducible build $SOURCE_DATE_EPOCH environment variable is now
382 7. Optionally, an alternate format for spool data-files which matches the
383 wire format - meaning more efficient reception and transmission (at the
384 cost of difficulty with standard Unix tools). Only used for messages
385 received using the ESMTP CHUNKING option, and when a new main-section
386 option "spool_wireformat" (false by default) is set.
388 8. New main configuration option "commandline_checks_require_admin" to
389 restrict who can use various introspection options.
391 9. New option modifier "no_check" for quota and quota_filecount
392 appendfile transport.
394 10. Variable $smtp_command_history returning a comma-sep list of recent
397 11. Millisecond timetamps in logs, on log_selector "millisec". Also affects
398 log elements QT, DT and D, and timstamps in debug output.
400 12. TCP Fast Open logging. As a server, logs when the SMTP banner was sent
401 while still in SYN_RECV state; as a client logs when the connection
402 is opened with a TFO cookie.
404 13. DKIM support for multiple signing, by domain and/or key-selector.
405 DKIM support for multiple hashes, and for alternate-identity tags.
406 Builtin macro with default list of signed headers.
407 Better syntax for specifying oversigning.
408 The DKIM ACL can override verification status, and status is visible in
411 14. Exipick understands -C|--config for an alternative Exim
414 15. TCP Fast Open used, with data-on-SYN, for client SMTP via SOCKS5 proxy,
415 for ${readsocket } expansions, and for ClamAV.
417 16. The "-be" expansion test mode now supports macros. Macros are expanded
418 in test lines, and new macros can be defined.
420 17. Support for server-side dual-certificate-stacks (eg. RSA + ECDSA).
426 1. Allow relative config file names for ".include"
428 2. A main-section config option "debug_store" to control the checks on
429 variable locations during store-reset. Normally false but can be enabled
430 when a memory corruption issue is suspected on a production system.
436 1. The new perl_taintmode option allows to run the embedded perl
437 interpreter in taint mode.
439 2. New log_selector: dnssec, adds a "DS" tag to acceptance and delivery lines.
441 3. Speculative debugging, via a "kill" option to the "control=debug" ACL
444 4. New expansion item ${sha3:<string>} / ${sha3_<N>:<string>}.
445 N can be 224, 256 (default), 384, 512.
446 With GnuTLS 3.5.0 or later, only.
448 5. Facility for named queues: A command-line argument can specify
449 the queue name for a queue operation, and an ACL modifier can set
450 the queue to be used for a message. A $queue_name variable gives
453 6. New expansion operators base32/base32d.
455 7. The CHUNKING ESMTP extension from RFC 3030. May give some slight
456 performance increase and network load decrease. Main config option
457 chunking_advertise_hosts, and smtp transport option hosts_try_chunking
460 8. LMDB lookup support, as Experimental. Patch supplied by Andrew Colin Kissa.
462 9. Expansion operator escape8bit, like escape but not touching newline etc..
464 10. Feature macros, generated from compile options. All start with "_HAVE_"
465 and go on with some roughly recognisable name. Driver macros, for
466 router, transport and authentication drivers; names starting with "_DRIVER_".
467 Option macros, for each configuration-file option; all start with "_OPT_".
468 Use the "-bP macros" command-line option to see what is present.
470 11. Integer values for options can take a "G" multiplier.
472 12. defer=pass option for the ACL control cutthrough_delivery, to reflect 4xx
473 returns from the target back to the initiator, rather than spooling the
476 13. New built-in constants available for tls_dhparam and default changed.
478 14. If built with EXPERIMENTAL_QUEUEFILE, a queuefile transport, for writing
479 out copies of the message spool files for use by 3rd-party scanners.
481 15. A new option on the smtp transport, hosts_try_fastopen. If the system
482 supports it (on Linux it must be enabled in the kernel by the sysadmin)
483 try to use RFC 7413 "TCP Fast Open". No data is sent on the SYN segment
484 but it permits a peer that also supports the facility to send its SMTP
485 banner immediately after the SYN,ACK segment rather then waiting for
486 another ACK - so saving up to one roundtrip time. Because it requires
487 previous communication with the peer (we save a cookie from it) this
488 will only become active on frequently-contacted destinations.
490 16. A new syslog_pid option to suppress PID duplication in syslog lines.
496 1. The ACL conditions regex and mime_regex now capture substrings
497 into numeric variables $regex1 to 9, like the "match" expansion condition.
499 2. New $callout_address variable records the address used for a spam=,
500 malware= or verify= callout.
502 3. Transports now take a "max_parallel" option, to limit concurrency.
504 4. Expansion operators ${ipv6norm:<string>} and ${ipv6denorm:<string>}.
505 The latter expands to a 8-element colon-sep set of hex digits including
506 leading zeroes. A trailing ipv4-style dotted-decimal set is converted
507 to hex. Pure ipv4 addresses are converted to IPv4-mapped IPv6.
508 The former operator strips leading zeroes and collapses the longest
509 set of 0-groups to a double-colon.
511 5. New "-bP config" support, to dump the effective configuration.
513 6. New $dkim_key_length variable.
515 7. New base64d and base64 expansion items (the existing str2b64 being a
516 synonym of the latter). Add support in base64 for certificates.
518 8. New main configuration option "bounce_return_linesize_limit" to
519 avoid oversize bodies in bounces. The default value matches RFC
522 9. New $initial_cwd expansion variable.
528 1. Support for using the system standard CA bundle.
530 2. New expansion items $config_file, $config_dir, containing the file
531 and directory name of the main configuration file. Also $exim_version.
533 3. New "malware=" support for Avast.
535 4. New "spam=" variant option for Rspamd.
537 5. Assorted options on malware= and spam= scanners.
539 6. A command-line option to write a comment into the logfile.
541 7. If built with EXPERIMENTAL_SOCKS feature enabled, the smtp transport can
542 be configured to make connections via socks5 proxies.
544 8. If built with EXPERIMENTAL_INTERNATIONAL, support is included for
545 the transmission of UTF-8 envelope addresses.
547 9. If built with EXPERIMENTAL_INTERNATIONAL, an expansion item for a commonly
548 used encoding of Maildir folder names.
550 10. A logging option for slow DNS lookups.
552 11. New ${env {<variable>}} expansion.
554 12. A non-SMTP authenticator using information from TLS client certificates.
556 13. Main option "tls_eccurve" for selecting an Elliptic Curve for TLS.
557 Patch originally by Wolfgang Breyha.
559 14. Main option "dns_trust_aa" for trusting your local nameserver at the
560 same level as DNSSEC.
565 1. If built with EXPERIMENTAL_DANE feature enabled, Exim will follow the
566 DANE SMTP draft to assess a secure chain of trust of the certificate
567 used to establish the TLS connection based on a TLSA record in the
568 domain of the sender.
570 2. The EXPERIMENTAL_TPDA feature has been renamed to EXPERIMENTAL_EVENT
571 and several new events have been created. The reason is because it has
572 been expanded beyond just firing events during the transport phase. Any
573 existing TPDA transport options will have to be rewritten to use a new
574 $event_name expansion variable in a condition. Refer to the
575 experimental-spec.txt for details and examples.
577 3. The EXPERIMENTAL_CERTNAMES features is an enhancement to verify that
578 server certs used for TLS match the result of the MX lookup. It does
579 not use the same mechanism as DANE.
589 1. If built with the EXPERIMENTAL_PROXY feature enabled, Exim can be
590 configured to expect an initial header from a proxy that will make the
591 actual external source IP:host be used in exim instead of the IP of the
592 proxy that is connecting to it.
594 2. New verify option header_names_ascii, which will check to make sure
595 there are no non-ASCII characters in header names. Exim itself handles
596 those non-ASCII characters, but downstream apps may not, so Exim can
597 detect and reject if those characters are present.
599 3. New expansion operator ${utf8clean:string} to replace malformed UTF8
600 codepoints with valid ones.
602 4. New malware type "sock". Talks over a Unix or TCP socket, sending one
603 command line and matching a regex against the return data for trigger
604 and a second regex to extract malware_name. The mail spoolfile name can
605 be included in the command line.
607 5. The smtp transport now supports options "tls_verify_hosts" and
608 "tls_try_verify_hosts". If either is set the certificate verification
609 is split from the encryption operation. The default remains that a failed
610 verification cancels the encryption.
612 6. New SERVERS override of default ldap server list. In the ACLs, an ldap
613 lookup can now set a list of servers to use that is different from the
616 7. New command-line option -C for exiqgrep to specify alternate exim.conf
617 file when searching the queue.
619 8. OCSP now supports GnuTLS also, if you have version 3.1.3 or later of that.
621 9. Support for DNSSEC on outbound connections.
623 10. New variables "tls_(in,out)_(our,peer)cert" and expansion item
624 "certextract" to extract fields from them. Hash operators md5 and sha1
625 work over them for generating fingerprints, and a new sha256 operator
628 11. PRDR is now supported dy default.
630 12. OCSP stapling is now supported by default.
632 13. If built with the EXPERIMENTAL_DSN feature enabled, Exim will output
633 Delivery Status Notification messages in MIME format, and negotiate
634 DSN features per RFC 3461.
640 1. New command-line option -bI:sieve will list all supported sieve extensions
641 of this Exim build on standard output, one per line.
642 ManageSieve (RFC 5804) providers managing scripts for use by Exim should
643 query this to establish the correct list to include in the protocol's
644 SIEVE capability line.
646 2. If the -n option is combined with the -bP option, then the name of an
647 emitted option is not output, only the value (if visible to you).
648 For instance, "exim -n -bP pid_file_path" should just emit a pathname
649 followed by a newline, and no other text.
651 3. When built with SUPPORT_TLS and USE_GNUTLS, the SMTP transport driver now
652 has a "tls_dh_min_bits" option, to set the minimum acceptable number of
653 bits in the Diffie-Hellman prime offered by a server (in DH ciphersuites)
654 acceptable for security. (Option accepted but ignored if using OpenSSL).
655 Defaults to 1024, the old value. May be lowered only to 512, or raised as
656 far as you like. Raising this may hinder TLS interoperability with other
657 sites and is not currently recommended. Lowering this will permit you to
658 establish a TLS session which is not as secure as you might like.
660 Unless you really know what you are doing, leave it alone.
662 4. If not built with DISABLE_DNSSEC, Exim now has the main option
663 dns_dnssec_ok; if set to 1 then Exim will initialise the resolver library
664 to send the DO flag to your recursive resolver. If you have a recursive
665 resolver, which can set the Authenticated Data (AD) flag in results, Exim
666 can now detect this. Exim does not perform validation itself, instead
667 relying upon a trusted path to the resolver.
669 Current status: work-in-progress; $sender_host_dnssec variable added.
671 5. DSCP support for outbound connections: on a transport using the smtp driver,
672 set "dscp = ef", for instance, to cause the connections to have the relevant
673 DSCP (IPv4 TOS or IPv6 TCLASS) value in the header.
675 Similarly for inbound connections, there is a new control modifier, dscp,
676 so "warn control = dscp/ef" in the connect ACL, or after authentication.
678 Supported values depend upon system libraries. "exim -bI:dscp" to list the
679 ones Exim knows of. You can also set a raw number 0..0x3F.
681 6. The -G command-line flag is no longer ignored; it is now equivalent to an
682 ACL setting "control = suppress_local_fixups". The -L command-line flag
683 is now accepted and forces use of syslog, with the provided tag as the
684 process name. A few other flags used by Sendmail are now accepted and
687 7. New cutthrough routing feature. Requested by a "control = cutthrough_delivery"
688 ACL modifier; works for single-recipient mails which are received on and
689 deliverable via SMTP. Using the connection made for a recipient verify,
690 if requested before the verify, or a new one made for the purpose while
691 the inbound connection is still active. The bulk of the mail item is copied
692 direct from the inbound socket to the outbound (as well as the spool file).
693 When the source notifies the end of data, the data acceptance by the destination
694 is negotiated before the acceptance is sent to the source. If the destination
695 does not accept the mail item, for example due to content-scanning, the item
696 is not accepted from the source and therefore there is no need to generate
697 a bounce mail. This is of benefit when providing a secondary-MX service.
698 The downside is that delays are under the control of the ultimate destination
701 The Received-by: header on items delivered by cutthrough is generated
702 early in reception rather than at the end; this will affect any timestamp
703 included. The log line showing delivery is recorded before that showing
704 reception; it uses a new ">>" tag instead of "=>".
706 To support the feature, verify-callout connections can now use ESMTP and TLS.
707 The usual smtp transport options are honoured, plus a (new, default everything)
708 hosts_verify_avoid_tls.
710 New variable families named tls_in_cipher, tls_out_cipher etc. are introduced
711 for specific access to the information for each connection. The old names
712 are present for now but deprecated.
714 Not yet supported: IGNOREQUOTA, SIZE, PIPELINING.
716 8. New expansion operators ${listnamed:name} to get the content of a named list
717 and ${listcount:string} to count the items in a list.
719 9. New global option "gnutls_allow_auto_pkcs11", defaults false. The GnuTLS
720 rewrite in 4.80 combines with GnuTLS 2.12.0 or later, to autoload PKCS11
721 modules. For some situations this is desirable, but we expect admin in
722 those situations to know they want the feature. More commonly, it means
723 that GUI user modules get loaded and are broken by the setuid Exim being
724 unable to access files specified in environment variables and passed
725 through, thus breakage. So we explicitly inhibit the PKCS11 initialisation
726 unless this new option is set.
728 Some older OS's with earlier versions of GnuTLS might not have pkcs11 ability,
729 so have also added a build option which can be used to build Exim with GnuTLS
730 but without trying to use any kind of PKCS11 support. Uncomment this in the
733 AVOID_GNUTLS_PKCS11=yes
735 10. The "acl = name" condition on an ACL now supports optional arguments.
736 New expansion item "${acl {name}{arg}...}" and expansion condition
737 "acl {{name}{arg}...}" are added. In all cases up to nine arguments
738 can be used, appearing in $acl_arg1 to $acl_arg9 for the called ACL.
739 Variable $acl_narg contains the number of arguments. If the ACL sets
740 a "message =" value this becomes the result of the expansion item,
741 or the value of $value for the expansion condition. If the ACL returns
742 accept the expansion condition is true; if reject, false. A defer
743 return results in a forced fail.
745 11. Routers and transports can now have multiple headers_add and headers_remove
746 option lines. The concatenated list is used.
748 12. New ACL modifier "remove_header" can remove headers before message gets
749 handled by routers/transports.
751 13. New dnsdb lookup pseudo-type "a+". A sequence of "a6" (if configured),
752 "aaaa" and "a" lookups is done and the full set of results returned.
754 14. New expansion variable $headers_added with content from ACL add_header
755 modifier (but not yet added to message).
757 15. New 8bitmime status logging option for received messages. Log field "M8S".
759 16. New authenticated_sender logging option, adding to log field "A".
761 17. New expansion variables $router_name and $transport_name. Useful
762 particularly for debug_print as -bt command-line option does not
763 require privilege whereas -d does.
765 18. If built with EXPERIMENTAL_PRDR, per-recipient data responses per a
766 proposed extension to SMTP from Eric Hall.
768 19. The pipe transport has gained the force_command option, to allow
769 decorating commands from user .forward pipe aliases with prefix
770 wrappers, for instance.
772 20. Callout connections can now AUTH; the same controls as normal delivery
775 21. Support for DMARC, using opendmarc libs, can be enabled. It adds new
776 options: dmarc_forensic_sender, dmarc_history_file, and dmarc_tld_file.
777 It adds new expansion variables $dmarc_ar_header, $dmarc_status,
778 $dmarc_status_text, and $dmarc_used_domain. It adds a new acl modifier
779 dmarc_status. It adds new control flags dmarc_disable_verify and
780 dmarc_enable_forensic. The default for the dmarc_tld_file option is
781 "/etc/exim/opendmarc.tlds" and can be changed via EDITME.
783 22. Add expansion variable $authenticated_fail_id, which is the username
784 provided to the authentication method which failed. It is available
785 for use in subsequent ACL processing (typically quit or notquit ACLs).
787 23. New ACL modifier "udpsend" can construct a UDP packet to send to a given
790 24. New ${hexquote:..string..} expansion operator converts non-printable
791 characters in the string to \xNN form.
793 25. Experimental TPDA (Transport Post Delivery Action) function added.
794 Patch provided by Axel Rau.
796 26. Experimental Redis lookup added. Patch provided by Warren Baker.
802 1. New authenticator driver, "gsasl". Server-only (at present).
803 This is a SASL interface, licensed under GPL, which can be found at
804 http://www.gnu.org/software/gsasl/.
805 This system does not provide sources of data for authentication, so
806 careful use needs to be made of the conditions in Exim.
808 2. New authenticator driver, "heimdal_gssapi". Server-only.
809 A replacement for using cyrus_sasl with Heimdal, now that $KRB5_KTNAME
810 is no longer honoured for setuid programs by Heimdal. Use the
811 "server_keytab" option to point to the keytab.
813 3. The "pkg-config" system can now be used when building Exim to reference
814 cflags and library information for lookups and authenticators, rather
815 than having to update "CFLAGS", "AUTH_LIBS", "LOOKUP_INCLUDE" and
816 "LOOKUP_LIBS" directly. Similarly for handling the TLS library support
817 without adjusting "TLS_INCLUDE" and "TLS_LIBS".
819 In addition, setting PCRE_CONFIG=yes will query the pcre-config tool to
820 find the headers and libraries for PCRE.
822 4. New expansion variable $tls_bits.
824 5. New lookup type, "dbmjz". Key is an Exim list, the elements of which will
825 be joined together with ASCII NUL characters to construct the key to pass
826 into the DBM library. Can be used with gsasl to access sasldb2 files as
829 6. OpenSSL now supports TLS1.1 and TLS1.2 with OpenSSL 1.0.1.
831 Avoid release 1.0.1a if you can. Note that the default value of
832 "openssl_options" is no longer "+dont_insert_empty_fragments", as that
833 increased susceptibility to attack. This may still have interoperability
834 implications for very old clients (see version 4.31 change 37) but
835 administrators can choose to make the trade-off themselves and restore
836 compatibility at the cost of session security.
838 7. Use of the new expansion variable $tls_sni in the main configuration option
839 tls_certificate will cause Exim to re-expand the option, if the client
840 sends the TLS Server Name Indication extension, to permit choosing a
841 different certificate; tls_privatekey will also be re-expanded. You must
842 still set these options to expand to valid files when $tls_sni is not set.
844 The SMTP Transport has gained the option tls_sni, which will set a hostname
845 for outbound TLS sessions, and set $tls_sni too.
847 A new log_selector, +tls_sni, has been added, to log received SNI values
848 for Exim as a server.
850 8. The existing "accept_8bitmime" option now defaults to true. This means
851 that Exim is deliberately not strictly RFC compliant. We're following
852 Dan Bernstein's advice in http://cr.yp.to/smtp/8bitmime.html by default.
853 Those who disagree, or know that they are talking to mail servers that,
854 even today, are not 8-bit clean, need to turn off this option.
856 9. Exim can now be started with -bw (with an optional timeout, given as
857 -bw<timespec>). With this, stdin at startup is a socket that is
858 already listening for connections. This has a more modern name of
859 "socket activation", but forcing the activated socket to fd 0. We're
860 interested in adding more support for modern variants.
862 10. ${eval } now uses 64-bit values on supporting platforms. A new "G" suffix
863 for numbers indicates multiplication by 1024^3.
865 11. The GnuTLS support has been revamped; the three options gnutls_require_kx,
866 gnutls_require_mac & gnutls_require_protocols are no longer supported.
867 tls_require_ciphers is now parsed by gnutls_priority_init(3) as a priority
868 string, documentation for which is at:
869 http://www.gnutls.org/manual/html_node/Priority-Strings.html
871 SNI support has been added to Exim's GnuTLS integration too.
873 For sufficiently recent GnuTLS libraries, ${randint:..} will now use
874 gnutls_rnd(), asking for GNUTLS_RND_NONCE level randomness.
876 12. With OpenSSL, if built with EXPERIMENTAL_OCSP, a new option tls_ocsp_file
877 is now available. If the contents of the file are valid, then Exim will
878 send that back in response to a TLS status request; this is OCSP Stapling.
879 Exim will not maintain the contents of the file in any way: administrators
880 are responsible for ensuring that it is up-to-date.
882 See "experimental-spec.txt" for more details.
884 13. ${lookup dnsdb{ }} supports now SPF record types. They are handled
885 identically to TXT record lookups.
887 14. New expansion variable $tod_epoch_l for higher-precision time.
889 15. New global option tls_dh_max_bits, defaulting to current value of NSS
890 hard-coded limit of DH ephemeral bits, to fix interop problems caused by
891 GnuTLS 2.12 library recommending a bit count higher than NSS supports.
893 16. tls_dhparam now used by both OpenSSL and GnuTLS, can be path or identifier.
894 Option can now be a path or an identifier for a standard prime.
895 If unset, we use the DH prime from section 2.2 of RFC 5114, "ike23".
896 Set to "historic" to get the old GnuTLS behaviour of auto-generated DH
899 17. SSLv2 now disabled by default in OpenSSL. (Never supported by GnuTLS).
900 Use "openssl_options -no_sslv2" to re-enable support, if your OpenSSL
901 install was not built with OPENSSL_NO_SSL2 ("no-ssl2").
907 1. New options for the ratelimit ACL condition: /count= and /unique=.
908 The /noupdate option has been replaced by a /readonly option.
910 2. The SMTP transport's protocol option may now be set to "smtps", to
911 use SSL-on-connect outbound.
913 3. New variable $av_failed, set true if the AV scanner deferred; ie, when
914 there is a problem talking to the AV scanner, or the AV scanner running.
916 4. New expansion conditions, "inlist" and "inlisti", which take simple lists
917 and check if the search item is a member of the list. This does not
918 support named lists, but does subject the list part to string expansion.
920 5. Unless the new EXPAND_LISTMATCH_RHS build option is set when Exim was
921 built, Exim no longer performs string expansion on the second string of
922 the match_* expansion conditions: "match_address", "match_domain",
923 "match_ip" & "match_local_part". Named lists can still be used.
929 1. The global option "dns_use_edns0" may be set to coerce EDNS0 usage on
930 or off in the resolver library.
936 1. In addition to the existing LDAP and LDAP/SSL ("ldaps") support, there
937 is now LDAP/TLS support, given sufficiently modern OpenLDAP client
938 libraries. The following global options have been added in support of
939 this: ldap_ca_cert_dir, ldap_ca_cert_file, ldap_cert_file, ldap_cert_key,
940 ldap_cipher_suite, ldap_require_cert, ldap_start_tls.
942 2. The pipe transport now takes a boolean option, "freeze_signal", default
943 false. When true, if the external delivery command exits on a signal then
944 Exim will freeze the message in the queue, instead of generating a bounce.
946 3. Log filenames may now use %M as an escape, instead of %D (still available).
947 The %M pattern expands to yyyymm, providing month-level resolution.
949 4. The $message_linecount variable is now updated for the maildir_tag option,
950 in the same way as $message_size, to reflect the real number of lines,
951 including any header additions or removals from transport.
953 5. When contacting a pool of SpamAssassin servers configured in spamd_address,
954 Exim now selects entries randomly, to better scale in a cluster setup.
960 1. SECURITY FIX: privilege escalation flaw fixed. On Linux (and only Linux)
961 the flaw permitted the Exim run-time user to cause root to append to
962 arbitrary files of the attacker's choosing, with the content based
963 on content supplied by the attacker.
965 2. Exim now supports loading some lookup types at run-time, using your
966 platform's dlopen() functionality. This has limited platform support
967 and the intention is not to support every variant, it's limited to
968 dlopen(). This permits the main Exim binary to not be linked against
969 all the libraries needed for all the lookup types.
975 NOTE: this version is not guaranteed backwards-compatible, please read the
976 items below carefully
978 1. A new main configuration option, "openssl_options", is available if Exim
979 is built with SSL support provided by OpenSSL. The option allows
980 administrators to specify OpenSSL options to be used on connections;
981 typically this is to set bug compatibility features which the OpenSSL
982 developers have not enabled by default. There may be security
983 consequences for certain options, so these should not be changed
986 2. A new pipe transport option, "permit_coredumps", may help with problem
987 diagnosis in some scenarios. Note that Exim is typically installed as
988 a setuid binary, which on most OSes will inhibit coredumps by default,
989 so that safety mechanism would have to be overridden for this option to
990 be able to take effect.
992 3. ClamAV 0.95 is now required for ClamAV support in Exim, unless
993 Local/Makefile sets: WITH_OLD_CLAMAV_STREAM=yes
994 Note that this switches Exim to use a new API ("INSTREAM") and a future
995 release of ClamAV will remove support for the old API ("STREAM").
997 The av_scanner option, when set to "clamd", now takes an optional third
998 part, "local", which causes Exim to pass a filename to ClamAV instead of
999 the file content. This is the same behaviour as when clamd is pointed at
1000 a Unix-domain socket. For example:
1002 av_scanner = clamd:192.0.2.3 1234:local
1004 ClamAV's ExtendedDetectionInfo response format is now handled.
1006 4. There is now a -bmalware option, restricted to admin users. This option
1007 takes one parameter, a filename, and scans that file with Exim's
1008 malware-scanning framework. This is intended purely as a debugging aid
1009 to ensure that Exim's scanning is working, not to replace other tools.
1010 Note that the ACL framework is not invoked, so if av_scanner references
1011 ACL variables without a fallback then this will fail.
1013 5. There is a new expansion operator, "reverse_ip", which will reverse IP
1014 addresses; IPv4 into dotted quad, IPv6 into dotted nibble. Examples:
1016 ${reverse_ip:192.0.2.4}
1018 ${reverse_ip:2001:0db8:c42:9:1:abcd:192.0.2.3}
1019 -> 3.0.2.0.0.0.0.c.d.c.b.a.1.0.0.0.9.0.0.0.2.4.c.0.8.b.d.0.1.0.0.2
1021 6. There is a new ACL control called "debug", to enable debug logging.
1022 This allows selective logging of certain incoming transactions within
1023 production environments, with some care. It takes two options, "tag"
1024 and "opts"; "tag" is included in the filename of the log and "opts"
1025 is used as per the -d<options> command-line option. Examples, which
1026 don't all make sense in all contexts:
1029 control = debug/tag=.$sender_host_address
1030 control = debug/opts=+expand+acl
1031 control = debug/tag=.$message_exim_id/opts=+expand
1033 7. It has always been implicit in the design and the documentation that
1034 "the Exim user" is not root. src/EDITME said that using root was
1035 "very strongly discouraged". This is not enough to keep people from
1036 shooting themselves in the foot in days when many don't configure Exim
1037 themselves but via package build managers. The security consequences of
1038 running various bits of network code are severe if there should be bugs in
1039 them. As such, the Exim user may no longer be root. If configured
1040 statically, Exim will refuse to build. If configured as ref:user then Exim
1041 will exit shortly after start-up. If you must shoot yourself in the foot,
1042 then henceforth you will have to maintain your own local patches to strip
1045 8. There is a new expansion condition, bool_lax{}. Where bool{} uses the ACL
1046 condition logic to determine truth/failure and will fail to expand many
1047 strings, bool_lax{} uses the router condition logic, where most strings
1049 Note: bool{00} is false, bool_lax{00} is true.
1051 9. Routers now support multiple "condition" tests.
1053 10. There is now a runtime configuration option "tcp_wrappers_daemon_name".
1054 Setting this allows an admin to define which entry in the tcpwrappers
1055 config file will be used to control access to the daemon. This option
1056 is only available when Exim is built with USE_TCP_WRAPPERS. The
1057 default value is set at build time using the TCP_WRAPPERS_DAEMON_NAME
1060 11. [POSSIBLE CONFIG BREAKAGE] The default value for system_filter_user is now
1061 the Exim run-time user, instead of root.
1063 12. [POSSIBLE CONFIG BREAKAGE] ALT_CONFIG_ROOT_ONLY is no longer optional and
1064 is forced on. This is mitigated by the new build option
1065 TRUSTED_CONFIG_LIST which defines a list of configuration files which
1066 are trusted; one per line. If a config file is owned by root and matches
1067 a pathname in the list, then it may be invoked by the Exim build-time
1068 user without Exim relinquishing root privileges.
1070 13. [POSSIBLE CONFIG BREAKAGE] The Exim user is no longer automatically
1071 trusted to supply -D<Macro[=Value]> overrides on the command-line. Going
1072 forward, we recommend using TRUSTED_CONFIG_LIST with shim configs that
1073 include the main config. As a transition mechanism, we are temporarily
1074 providing a work-around: the new build option WHITELIST_D_MACROS provides
1075 a colon-separated list of macro names which may be overridden by the Exim
1076 run-time user. The values of these macros are constrained to the regex
1077 ^[A-Za-z0-9_/.-]*$ (which explicitly does allow for empty values).
1083 1. TWO SECURITY FIXES: one relating to mail-spools which are globally
1084 writable, the other to locking of MBX folders (not mbox).
1086 2. MySQL stored procedures are now supported.
1088 3. The dkim_domain transport option is now a list, not a single string, and
1089 messages will be signed for each element in the list (discarding
1092 4. The 4.70 release unexpectedly changed the behaviour of dnsdb TXT lookups
1093 in the presence of multiple character strings within the RR. Prior to 4.70,
1094 only the first string would be returned. The dnsdb lookup now, by default,
1095 preserves the pre-4.70 semantics, but also now takes an extended output
1096 separator specification. The separator can be followed by a semicolon, to
1097 concatenate the individual text strings together with no join character,
1098 or by a comma and a second separator character, in which case the text
1099 strings within a TXT record are joined on that second character.
1100 Administrators are reminded that DNS provides no ordering guarantees
1101 between multiple records in an RRset. For example:
1103 foo.example. IN TXT "a" "b" "c"
1104 foo.example. IN TXT "d" "e" "f"
1106 ${lookup dnsdb{>/ txt=foo.example}} -> "a/d"
1107 ${lookup dnsdb{>/; txt=foo.example}} -> "def/abc"
1108 ${lookup dnsdb{>/,+ txt=foo.example}} -> "a+b+c/d+e+f"
1114 1. Native DKIM support without an external library.
1115 (Note that if no action to prevent it is taken, a straight upgrade will
1116 result in DKIM verification of all signed incoming emails. See spec
1117 for details on conditionally disabling)
1119 2. Experimental DCC support via dccifd (contributed by Wolfgang Breyha).
1121 3. There is now a bool{} expansion condition which maps certain strings to
1122 true/false condition values (most likely of use in conjunction with the
1123 and{} expansion operator).
1125 4. The $spam_score, $spam_bar and $spam_report variables are now available
1128 5. exim -bP now supports "macros", "macro_list" or "macro MACRO_NAME" as
1129 options, provided that Exim is invoked by an admin_user.
1131 6. There is a new option gnutls_compat_mode, when linked against GnuTLS,
1132 which increases compatibility with older clients at the cost of decreased
1133 security. Don't set this unless you need to support such clients.
1135 7. There is a new expansion operator, ${randint:...} which will produce a
1136 "random" number less than the supplied integer. This randomness is
1137 not guaranteed to be cryptographically strong, but depending upon how
1138 Exim was built may be better than the most naive schemes.
1140 8. Exim now explicitly ensures that SHA256 is available when linked against
1143 9. The transport_filter_timeout option now applies to SMTP transports too.
1149 1. Preliminary DKIM support in Experimental.
1155 1. The body_linecount and body_zerocount C variables are now exported in the
1158 2. When a dnslists lookup succeeds, the key that was looked up is now placed
1159 in $dnslist_matched. When the key is an IP address, it is not reversed in
1160 this variable (though it is, of course, in the actual lookup). In simple
1163 deny dnslists = spamhaus.example
1165 the key is also available in another variable (in this case,
1166 $sender_host_address). In more complicated cases, however, this is not
1167 true. For example, using a data lookup might generate a dnslists lookup
1170 deny dnslists = spamhaus.example/<|192.168.1.2|192.168.6.7|...
1172 If this condition succeeds, the value in $dnslist_matched might be
1173 192.168.6.7 (for example).
1175 3. Authenticators now have a client_condition option. When Exim is running as
1176 a client, it skips an authenticator whose client_condition expansion yields
1177 "0", "no", or "false". This can be used, for example, to skip plain text
1178 authenticators when the connection is not encrypted by a setting such as:
1180 client_condition = ${if !eq{$tls_cipher}{}}
1182 Note that the 4.67 documentation states that $tls_cipher contains the
1183 cipher used for incoming messages. In fact, during SMTP delivery, it
1184 contains the cipher used for the delivery. The same is true for
1187 4. There is now a -Mvc <message-id> option, which outputs a copy of the
1188 message to the standard output, in RFC 2822 format. The option can be used
1189 only by an admin user.
1191 5. There is now a /noupdate option for the ratelimit ACL condition. It
1192 computes the rate and checks the limit as normal, but it does not update
1193 the saved data. This means that, in relevant ACLs, it is possible to lookup
1194 the existence of a specified (or auto-generated) ratelimit key without
1195 incrementing the ratelimit counter for that key.
1197 In order for this to be useful, another ACL entry must set the rate
1198 for the same key somewhere (otherwise it will always be zero).
1203 # Read the rate; if it doesn't exist or is below the maximum
1204 # we update it below
1205 deny ratelimit = 100 / 5m / strict / noupdate
1206 log_message = RATE: $sender_rate / $sender_rate_period \
1207 (max $sender_rate_limit)
1209 [... some other logic and tests...]
1211 warn ratelimit = 100 / 5m / strict / per_cmd
1212 log_message = RATE UPDATE: $sender_rate / $sender_rate_period \
1213 (max $sender_rate_limit)
1214 condition = ${if le{$sender_rate}{$sender_rate_limit}}
1218 6. The variable $max_received_linelength contains the number of bytes in the
1219 longest line that was received as part of the message, not counting the
1220 line termination character(s).
1222 7. Host lists can now include +ignore_defer and +include_defer, analogous to
1223 +ignore_unknown and +include_unknown. These options should be used with
1224 care, probably only in non-critical host lists such as whitelists.
1226 8. There's a new option called queue_only_load_latch, which defaults true.
1227 If set false when queue_only_load is greater than zero, Exim re-evaluates
1228 the load for each incoming message in an SMTP session. Otherwise, once one
1229 message is queued, the remainder are also.
1231 9. There is a new ACL, specified by acl_smtp_notquit, which is run in most
1232 cases when an SMTP session ends without sending QUIT. However, when Exim
1233 itself is in bad trouble, such as being unable to write to its log files,
1234 this ACL is not run, because it might try to do things (such as write to
1235 log files) that make the situation even worse.
1237 Like the QUIT ACL, this new ACL is provided to make it possible to gather
1238 statistics. Whatever it returns (accept or deny) is immaterial. The "delay"
1239 modifier is forbidden in this ACL.
1241 When the NOTQUIT ACL is running, the variable $smtp_notquit_reason is set
1242 to a string that indicates the reason for the termination of the SMTP
1243 connection. The possible values are:
1245 acl-drop Another ACL issued a "drop" command
1246 bad-commands Too many unknown or non-mail commands
1247 command-timeout Timeout while reading SMTP commands
1248 connection-lost The SMTP connection has been lost
1249 data-timeout Timeout while reading message data
1250 local-scan-error The local_scan() function crashed
1251 local-scan-timeout The local_scan() function timed out
1252 signal-exit SIGTERM or SIGINT
1253 synchronization-error SMTP synchronization error
1254 tls-failed TLS failed to start
1256 In most cases when an SMTP connection is closed without having received
1257 QUIT, Exim sends an SMTP response message before actually closing the
1258 connection. With the exception of acl-drop, the default message can be
1259 overridden by the "message" modifier in the NOTQUIT ACL. In the case of a
1260 "drop" verb in another ACL, it is the message from the other ACL that is
1263 10. For MySQL and PostgreSQL lookups, it is now possible to specify a list of
1264 servers with individual queries. This is done by starting the query with
1265 "servers=x:y:z;", where each item in the list may take one of two forms:
1267 (1) If it is just a host name, the appropriate global option (mysql_servers
1268 or pgsql_servers) is searched for a host of the same name, and the
1269 remaining parameters (database, user, password) are taken from there.
1271 (2) If it contains any slashes, it is taken as a complete parameter set.
1273 The list of servers is used in exactly the same was as the global list.
1274 Once a connection to a server has happened and a query has been
1275 successfully executed, processing of the lookup ceases.
1277 This feature is intended for use in master/slave situations where updates
1278 are occurring, and one wants to update a master rather than a slave. If the
1279 masters are in the list for reading, you might have:
1281 mysql_servers = slave1/db/name/pw:slave2/db/name/pw:master/db/name/pw
1283 In an updating lookup, you could then write
1285 ${lookup mysql{servers=master; UPDATE ...}
1287 If, on the other hand, the master is not to be used for reading lookups:
1289 pgsql_servers = slave1/db/name/pw:slave2/db/name/pw
1291 you can still update the master by
1293 ${lookup pgsql{servers=master/db/name/pw; UPDATE ...}
1295 11. The message_body_newlines option (default FALSE, for backwards
1296 compatibility) can be used to control whether newlines are present in
1297 $message_body and $message_body_end. If it is FALSE, they are replaced by
1304 1. There is a new log selector called smtp_no_mail, which is not included in
1305 the default setting. When it is set, a line is written to the main log
1306 whenever an accepted SMTP connection terminates without having issued a
1309 2. When an item in a dnslists list is followed by = and & and a list of IP
1310 addresses, the behaviour was not clear when the lookup returned more than
1311 one IP address. This has been solved by the addition of == and =& for "all"
1312 rather than the default "any" matching.
1314 3. Up till now, the only control over which cipher suites GnuTLS uses has been
1315 for the cipher algorithms. New options have been added to allow some of the
1316 other parameters to be varied.
1318 4. There is a new compile-time option called ENABLE_DISABLE_FSYNC. When it is
1319 set, Exim compiles a runtime option called disable_fsync.
1321 5. There is a new variable called $smtp_count_at_connection_start.
1323 6. There's a new control called no_pipelining.
1325 7. There are two new variables called $sending_ip_address and $sending_port.
1326 These are set whenever an SMTP connection to another host has been set up.
1328 8. The expansion of the helo_data option in the smtp transport now happens
1329 after the connection to the server has been made.
1331 9. There is a new expansion operator ${rfc2047d: that decodes strings that
1332 are encoded as per RFC 2047.
1334 10. There is a new log selector called "pid", which causes the current process
1335 id to be added to every log line, in square brackets, immediately after the
1338 11. Exim has been modified so that it flushes SMTP output before implementing
1339 a delay in an ACL. It also flushes the output before performing a callout,
1340 as this can take a substantial time. These behaviours can be disabled by
1341 obeying control = no_delay_flush or control = no_callout_flush,
1342 respectively, at some earlier stage of the connection.
1344 12. There are two new expansion conditions that iterate over a list. They are
1345 called forany and forall.
1347 13. There's a new global option called dsn_from that can be used to vary the
1348 contents of From: lines in bounces and other automatically generated
1349 messages ("delivery status notifications" - hence the name of the option).
1351 14. The smtp transport has a new option called hosts_avoid_pipelining.
1353 15. By default, exigrep does case-insensitive matches. There is now a -I option
1354 that makes it case-sensitive.
1356 16. A number of new features ("addresses", "map", "filter", and "reduce") have
1357 been added to string expansions to make it easier to process lists of
1358 items, typically addresses.
1360 17. There's a new ACL modifier called "continue". It does nothing of itself,
1361 and processing of the ACL always continues with the next condition or
1362 modifier. It is provided so that the side effects of expanding its argument
1365 18. It is now possible to use newline and other control characters (those with
1366 values less than 32, plus DEL) as separators in lists.
1368 19. The exigrep utility now has a -v option, which inverts the matching
1371 20. The host_find_failed option in the manualroute router can now be set to
1378 No new features were added to 4.66.
1384 No new features were added to 4.65.
1390 1. ACL variables can now be given arbitrary names, as long as they start with
1391 "acl_c" or "acl_m" (for connection variables and message variables), are at
1392 least six characters long, with the sixth character being either a digit or
1395 2. There is a new ACL modifier called log_reject_target. It makes it possible
1396 to specify which logs are used for messages about ACL rejections.
1398 3. There is a new authenticator called "dovecot". This is an interface to the
1399 authentication facility of the Dovecot POP/IMAP server, which can support a
1400 number of authentication methods.
1402 4. The variable $message_headers_raw provides a concatenation of all the
1403 messages's headers without any decoding. This is in contrast to
1404 $message_headers, which does RFC2047 decoding on the header contents.
1406 5. In a DNS black list, if two domain names, comma-separated, are given, the
1407 second is used first to do an initial check, making use of any IP value
1408 restrictions that are set. If there is a match, the first domain is used,
1409 without any IP value restrictions, to get the TXT record.
1411 6. All authenticators now have a server_condition option.
1413 7. There is a new command-line option called -Mset. It is useful only in
1414 conjunction with -be (that is, when testing string expansions). It must be
1415 followed by a message id; Exim loads the given message from its spool
1416 before doing the expansions.
1418 8. Another similar new command-line option is called -bem. It operates like
1419 -be except that it must be followed by the name of a file that contains a
1422 9. When an address is delayed because of a 4xx response to a RCPT command, it
1423 is now the combination of sender and recipient that is delayed in
1424 subsequent queue runs until its retry time is reached.
1426 10. Unary negation and the bitwise logical operators and, or, xor, not, and
1427 shift, have been added to the eval: and eval10: expansion items.
1429 11. The variables $interface_address and $interface_port have been renamed
1430 as $received_ip_address and $received_port, to make it clear that they
1431 relate to message reception rather than delivery. (The old names remain
1432 available for compatibility.)
1434 12. The "message" modifier can now be used on "accept" and "discard" acl verbs
1435 to vary the message that is sent when an SMTP command is accepted.
1441 1. There is a new Boolean option called filter_prepend_home for the redirect
1444 2. There is a new acl, set by acl_not_smtp_start, which is run right at the
1445 start of receiving a non-SMTP message, before any of the message has been
1448 3. When an SMTP error message is specified in a "message" modifier in an ACL,
1449 or in a :fail: or :defer: message in a redirect router, Exim now checks the
1450 start of the message for an SMTP error code.
1452 4. There is a new parameter for LDAP lookups called "referrals", which takes
1453 one of the settings "follow" (the default) or "nofollow".
1455 5. Version 20070721.2 of exipick now included, offering these new options:
1457 After all other sorting options have bee processed, reverse order
1458 before displaying messages (-R is synonym).
1460 Randomize order of matching messages before displaying.
1462 Instead of displaying the matching messages, display the sum
1464 --sort <variable>[,<variable>...]
1465 Before displaying matching messages, sort the messages according to
1466 each messages value for each variable.
1468 Negate the value for every test (returns inverse output from the
1469 same criteria without --not).
1475 1. The ${readsocket expansion item now supports Internet domain sockets as well
1476 as Unix domain sockets. If the first argument begins "inet:", it must be of
1477 the form "inet:host:port". The port is mandatory; it may be a number or the
1478 name of a TCP port in /etc/services. The host may be a name, or it may be an
1479 IP address. An ip address may optionally be enclosed in square brackets.
1480 This is best for IPv6 addresses. For example:
1482 ${readsocket{inet:[::1]:1234}{<request data>}...
1484 Only a single host name may be given, but if looking it up yield more than
1485 one IP address, they are each tried in turn until a connection is made. Once
1486 a connection has been made, the behaviour is as for ${readsocket with a Unix
1489 2. If a redirect router sets up file or pipe deliveries for more than one
1490 incoming address, and the relevant transport has batch_max set greater than
1491 one, a batch delivery now occurs.
1493 3. The appendfile transport has a new option called maildirfolder_create_regex.
1494 Its value is a regular expression. For a maildir delivery, this is matched
1495 against the maildir directory; if it matches, Exim ensures that a
1496 maildirfolder file is created alongside the new, cur, and tmp directories.
1502 The documentation is up-to-date for the 4.61 release. Major new features since
1503 the 4.60 release are:
1505 . An option called disable_ipv6, to disable the use of IPv6 completely.
1507 . An increase in the number of ACL variables to 20 of each type.
1509 . A change to use $auth1, $auth2, and $auth3 in authenticators instead of $1,
1510 $2, $3, (though those are still set) because the numeric variables get used
1511 for other things in complicated expansions.
1513 . The default for rfc1413_query_timeout has been changed from 30s to 5s.
1515 . It is possible to use setclassresources() on some BSD OS to control the
1516 resources used in pipe deliveries.
1518 . A new ACL modifier called add_header, which can be used with any verb.
1520 . More errors are detectable in retry rules.
1522 There are a number of other additions too.
1528 The documentation is up-to-date for the 4.60 release. Major new features since
1529 the 4.50 release are:
1531 . Support for SQLite.
1533 . Support for IGNOREQUOTA in LMTP.
1535 . Extensions to the "submission mode" features.
1537 . Support for Client SMTP Authorization (CSA).
1539 . Support for ratelimiting hosts and users.
1541 . New expansion items to help with the BATV "prvs" scheme.
1543 . A "match_ip" condition, that matches an IP address against a list.
1545 There are many more minor changes.