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. The dkim_status ACL condition may now be used in data ACLs
16 1. The expansion-test facility (exim -be) can set variables.
18 2. An event on a failing SMTP AUTH, for both client and server operations.
20 3. Variable $sender_helo_verified with the result of an ACL "verify = helo".
22 4. Predefined macros for expansion items, operators, conditions and variables.
24 5. The smtp transport option "max_rcpt" is now expanded before use.
26 6. The tls_eccurve option for OpenSSL now takes a list of group names.
28 7. Queue runners for several queues can now be started from one daemon.
30 8. New utility exim_msgdate converts message-ids to human readable format.
32 9. An expansion operator for wrapping long header lines.
34 10. A commandline option to print just the message IDs of the queue
36 11. An option for the ${readsocket } expansion to set an SNI for TLS.
38 12. The ACL remove_header modifier can take a pattern.
40 13. Variable $recipients_list, a properly-quoted exim list.
42 14. A log_selector for an incoming connection ID.
47 1. A new ACL condition: seen. Records/tests a timestamp against a key.
49 2. A variant of the "mask" expansion operator to give normalised IPv6.
51 3. UTC output option for exim_dumpdb, exim_fixdb.
53 4. An event for failing TLS connects to the daemon.
55 5. The ACL "debug" control gains options "stop", "pretrigger" and "trigger".
57 6. Query-style lookups are now checked for quoting, if the query string is
58 built using untrusted data ("tainted"). For now lack of quoting is merely
59 logged; a future release will upgrade this to an error.
61 7. The expansion conditions match_<list-type> and inlist now set $value for
62 the expansion of the "true" result of the ${if}. With a static list, this
63 can be used for de-tainting.
65 8. Recipient verify callouts now set $domain_data & $local_part_data, with
71 1. The fast-ramp two phase queue run support, previously experimental, is
72 now supported by default.
74 2. The native SRS support, previously experimental, is now supported. It is
75 not built unless specified in the Local/Makefile.
77 3. TLS resumption support, previously experimental, is now supported and
78 included in default builds.
80 4. Single-key LMDB lookups, previously experimental, are now supported.
81 The support is not built unless specified in the Local/Makefile.
83 5. Option "message_linelength_limit" on the smtp transport to enforce (by
84 default) the RFC 998 character limit.
86 6. An option to ignore the cache on a lookup.
88 7. Quota checking during reception (i.e. at SMTP time) for appendfile-
89 transport-managed quotas.
91 8. Sqlite lookups accept a "file=<path>" option to specify a per-operation
92 db file, replacing the previous prefix to the SQL string (which had
93 issues when the SQL used tainted values).
95 9. Lsearch lookups accept a "ret=full" option, to return both the portion
96 of the line matching the key, and the remainder.
98 10. A command-line option to have a daemon not create a notifier socket.
100 11. Faster TLS startup. When various configuration options contain no
101 expandable elements, the information can be preloaded and cached rather
102 than the previous behaviour of always loading at startup time for every
103 connection. This helps particularly for the CA bundle.
105 12. Proxy Protocol Timeout is configurable via "proxy_protocol_timeout"
108 13. Option "smtp_accept_max_per_connection" is now expanded.
110 14. Log selector "queue_time_exclusive", enabled by default, to exclude the
111 time taken for reception from QT log elements.
113 15. Main option "smtp_backlog_monitor", to set a level above which listen
114 socket backlogs are logged.
116 16. Main option "hosts_require_helo", requiring HELO or EHLO before MAIL.
118 17. A main config option "allow_insecure_tainted_data" allows to turn
120 18. TLS ALPN handling. By default, refuse TLS connections that try to specify
121 a non-smtp (eg. http) use. Options for customising.
123 19. Support for MacOS (darwin) has been dropped.
129 1. EXPERIMENTAL_SRS_NATIVE optional build feature. See the experimental.spec
132 2. Channel-binding for authenticators is now supported under OpenSSL.
133 Previously it was GnuTLS-only.
135 3. A msg:defer event.
137 4. Client-side support in the gsasl authenticator. Tested against the
138 plaintext driver for PLAIN; only against itself for SCRAM-SHA-1 and
139 SCRAM-SHA-1-PLUS methods.
141 5. Server-side support in the gsasl authenticator for encrypted passwords, as
142 an alternate for the existing plaintext.
144 6. Variable $local_part_data now also set by router check_local_user option,
145 with an de-tainted version of $local_part.
147 7. Named-list definitions can now be prefixed "hide" so that "-bP" commands do
148 not output the content. Previously this could only be done on options.
150 8. As an experimental feature, the dovecot authentication driver supports inet
151 sockets. Previously it was unix-domain sockets only.
153 9. The ACL control "queue_only" can also be spelled "queue", and now takes an
154 option "first_pass_route" to do the same as a "-odqs" on the command line.
156 10. Items specified for the router and transport headers_remove option can use
157 a trailing asterisk to specify globbing.
159 11. New $queue_size variable.
161 12. New variables $local_part_{pre,suf}fix_v.
163 13. New main option "sqlite_dbfile", for use in preference to prefixing the
164 lookup string. The older method fails when tainted variables are used
165 in the lookup, as the filename becomes tainted. The new method keeps the
168 14. Options on the dsearch lookup, to return the full path and to filter
169 filetypes for matching.
171 15. Options on pgsql and mysql lookups, to specify server separate from the
174 16. An option on all single-key lookups, to return (on a hit) a de-tainted
175 version of the lookup key rather than the looked-up data.
177 17. $domain_data and $local_part_data are now set by all list-match successes.
178 Previously only list items that performed lookups did so.
179 Also, matching list items that are tail-match or RE-match now set the
180 numeric variables $0 (etc) in the same way os other RE matches.
182 18. Expansion item ${listquote {<char} {<item>}}.
184 19. An option for the ${readsocket {}{}{}} expansion to make the result data
187 20. dkim_verify_min_keysizes, a list of minimum acceptable public-key sizes.
189 21. bounce_message_file and warn_message_file are now expanded before use.
191 22. New main config option spf_smtp_comment_template to customise the
192 $spf_smtp_comment variable
199 1. An "external" authenticator, per RFC 4422 Appendix A.
201 2. A JSON lookup type, and JSON variants of the forall/any expansion conditions.
203 3. Variables $tls_in_cipher_std, $tls_out_cipher_std giving the RFC names
206 4. Log_selectors "msg_id" (on by default) and "msg_id_created".
208 5. A case_insensitive option for verify=not_blind.
210 6. EXPERIMENTAL_TLS_RESUME optional build feature. See the experimental.spec
213 7. A main option exim_version to override the version Exim
214 reports in verious places ($exim_version, $version_number).
216 8. Expansion operator ${sha2_N:} for N=256, 384, 512.
218 9. Router variables, $r_... settable from router options and usable in routers
221 10. The spf lookup now supports IPv6.
223 11. Main options for DKIM verify to filter hash and key types.
225 12. With TLS1.3, support for full-chain OCSP stapling.
227 13. Dual-certificate stacks on servers now support OCSP stapling, under OpenSSL.
229 14: An smtp:ehlo transport event, for observability of the remote offered features.
231 15: Support under OpenSSL for writing NSS-style key files for packet-capture
232 decode. The environment variable SSLKEYLOGFILE is used; if an absolute path
233 it must indicate a file under the spool directory; if relative the the spool
234 directory is prepended. Works on the server side only. Support under
235 GnuTLS was already there, being done purely by the library (server side
236 only, and exim must be run as root).
238 16: Command-line option to move messages from one named queue to another.
240 17. Variables $tls_in_ver, $tls_out_ver.
246 1. ${l_header:<name>} and ${l_h:<name>} expansion items, giving a colon-sep
247 list when there are multiple headers having a given name. This matters
248 when individual headers are wrapped onto multiple lines; with previous
249 facilities hard to parse.
251 2. The ${readsocket } expansion item now takes a "tls" option, doing the
254 3. EXPERIMENTAL_REQUIRETLS and EXPERIMENTAL_PIPE_CONNECT optional build
255 features. See the experimental.spec file.
257 4. If built with SUPPORT_I18N a "utf8_downconvert" option on the smtp transport.
259 5. A "pipelining" log_selector.
261 6. Builtin macros for supported log_selector and openssl_options values.
263 7. JSON variants of the ${extract } expansion item.
265 8. A "noutf8" debug option, for disabling the UTF-8 characters in debug output.
267 9. TCP Fast Open support on MacOS.
272 1. Dual-certificate stacks on servers now support OCSP stapling, under GnuTLS
273 version 3.5.6 or later.
275 2. DANE is now supported under GnuTLS version 3.0.0 or later. Both GnuTLS and
276 OpenSSL versions are moved to mainline support from Experimental.
277 New SMTP transport option "dane_require_tls_ciphers".
279 3. Feature macros for the compiled-in set of malware scanner interfaces.
281 4. SPF support is promoted from Experimental to mainline status. The template
282 src/EDITME makefile does not enable its inclusion.
284 5. Logging control for DKIM verification. The existing DKIM log line is
285 controlled by a "dkim_verbose" selector which is _not_ enabled by default.
286 A new tag "DKIM=<domain>" is added to <= lines by default, controlled by
287 a "dkim" log_selector.
289 6. Receive duration on <= lines, under a new log_selector "receive_time".
291 7. Options "ipv4_only" and "ipv4_prefer" on the dnslookup router and on
292 routing rules in the manualroute router.
294 8. Expansion item ${sha3:<string>} / ${sha3_<N>:<string>} now also supported
295 under OpenSSL version 1.1.1 or later.
297 9. DKIM operations can now use the Ed25519 algorithm in addition to RSA, under
298 GnuTLS 3.6.0 or OpenSSL 1.1.1 or later.
300 10. Builtin feature-macros _CRYPTO_HASH_SHA3 and _CRYPTO_SIGN_ED25519, library
303 11. "exim -bP macro <name>" returns caller-usable status.
305 12. Expansion item ${authresults {<machine>}} for creating an
306 Authentication-Results: header.
308 13. EXPERIMENTAL_ARC. See the experimental.spec file.
309 See also new util/renew-opendmarc-tlds.sh script for use with DMARC/ARC.
311 14: A dane:fail event, intended to facilitate reporting.
313 15. "Lightweight" support for Redis Cluster. Requires redis_servers list to
314 contain all the servers in the cluster, all of which must be reachable from
315 the running exim instance. If the cluster has master/slave replication, the
316 list must contain all the master and slave servers.
318 16. Add an option to the Avast scanner interface: "pass_unscanned". This
319 allows to treat unscanned files as clean. Files may be unscanned for
320 several reasons: decompression bombs, broken archives.
326 1. PKG_CONFIG_PATH can now be set in Local/Makefile;
327 wildcards will be expanded, values are collapsed.
329 2. The ${readsocket } expansion now takes an option to not shutdown the
330 connection after sending the query string. The default remains to do so.
332 3. An smtp transport option "hosts_noproxy_tls" to control whether multiple
333 deliveries on a single TCP connection can maintain a TLS connection
334 open. By default disabled for all hosts, doing so saves the cost of
335 making new TLS sessions, at the cost of having to proxy the data via
336 another process. Logging is also affected.
338 4. A malware connection type for the FPSCAND protocol.
340 5. An option for recipient verify callouts to hold the connection open for
341 further recipients and for delivery.
343 6. The reproducible build $SOURCE_DATE_EPOCH environment variable is now
346 7. Optionally, an alternate format for spool data-files which matches the
347 wire format - meaning more efficient reception and transmission (at the
348 cost of difficulty with standard Unix tools). Only used for messages
349 received using the ESMTP CHUNKING option, and when a new main-section
350 option "spool_wireformat" (false by default) is set.
352 8. New main configuration option "commandline_checks_require_admin" to
353 restrict who can use various introspection options.
355 9. New option modifier "no_check" for quota and quota_filecount
356 appendfile transport.
358 10. Variable $smtp_command_history returning a comma-sep list of recent
361 11. Millisecond timetamps in logs, on log_selector "millisec". Also affects
362 log elements QT, DT and D, and timstamps in debug output.
364 12. TCP Fast Open logging. As a server, logs when the SMTP banner was sent
365 while still in SYN_RECV state; as a client logs when the connection
366 is opened with a TFO cookie.
368 13. DKIM support for multiple signing, by domain and/or key-selector.
369 DKIM support for multiple hashes, and for alternate-identity tags.
370 Builtin macro with default list of signed headers.
371 Better syntax for specifying oversigning.
372 The DKIM ACL can override verification status, and status is visible in
375 14. Exipick understands -C|--config for an alternative Exim
378 15. TCP Fast Open used, with data-on-SYN, for client SMTP via SOCKS5 proxy,
379 for ${readsocket } expansions, and for ClamAV.
381 16. The "-be" expansion test mode now supports macros. Macros are expanded
382 in test lines, and new macros can be defined.
384 17. Support for server-side dual-certificate-stacks (eg. RSA + ECDSA).
390 1. Allow relative config file names for ".include"
392 2. A main-section config option "debug_store" to control the checks on
393 variable locations during store-reset. Normally false but can be enabled
394 when a memory corruption issue is suspected on a production system.
400 1. The new perl_taintmode option allows to run the embedded perl
401 interpreter in taint mode.
403 2. New log_selector: dnssec, adds a "DS" tag to acceptance and delivery lines.
405 3. Speculative debugging, via a "kill" option to the "control=debug" ACL
408 4. New expansion item ${sha3:<string>} / ${sha3_<N>:<string>}.
409 N can be 224, 256 (default), 384, 512.
410 With GnuTLS 3.5.0 or later, only.
412 5. Facility for named queues: A command-line argument can specify
413 the queue name for a queue operation, and an ACL modifier can set
414 the queue to be used for a message. A $queue_name variable gives
417 6. New expansion operators base32/base32d.
419 7. The CHUNKING ESMTP extension from RFC 3030. May give some slight
420 performance increase and network load decrease. Main config option
421 chunking_advertise_hosts, and smtp transport option hosts_try_chunking
424 8. LMDB lookup support, as Experimental. Patch supplied by Andrew Colin Kissa.
426 9. Expansion operator escape8bit, like escape but not touching newline etc..
428 10. Feature macros, generated from compile options. All start with "_HAVE_"
429 and go on with some roughly recognisable name. Driver macros, for
430 router, transport and authentication drivers; names starting with "_DRIVER_".
431 Option macros, for each configuration-file option; all start with "_OPT_".
432 Use the "-bP macros" command-line option to see what is present.
434 11. Integer values for options can take a "G" multiplier.
436 12. defer=pass option for the ACL control cutthrough_delivery, to reflect 4xx
437 returns from the target back to the initiator, rather than spooling the
440 13. New built-in constants available for tls_dhparam and default changed.
442 14. If built with EXPERIMENTAL_QUEUEFILE, a queuefile transport, for writing
443 out copies of the message spool files for use by 3rd-party scanners.
445 15. A new option on the smtp transport, hosts_try_fastopen. If the system
446 supports it (on Linux it must be enabled in the kernel by the sysadmin)
447 try to use RFC 7413 "TCP Fast Open". No data is sent on the SYN segment
448 but it permits a peer that also supports the facility to send its SMTP
449 banner immediately after the SYN,ACK segment rather then waiting for
450 another ACK - so saving up to one roundtrip time. Because it requires
451 previous communication with the peer (we save a cookie from it) this
452 will only become active on frequently-contacted destinations.
454 16. A new syslog_pid option to suppress PID duplication in syslog lines.
460 1. The ACL conditions regex and mime_regex now capture substrings
461 into numeric variables $regex1 to 9, like the "match" expansion condition.
463 2. New $callout_address variable records the address used for a spam=,
464 malware= or verify= callout.
466 3. Transports now take a "max_parallel" option, to limit concurrency.
468 4. Expansion operators ${ipv6norm:<string>} and ${ipv6denorm:<string>}.
469 The latter expands to a 8-element colon-sep set of hex digits including
470 leading zeroes. A trailing ipv4-style dotted-decimal set is converted
471 to hex. Pure ipv4 addresses are converted to IPv4-mapped IPv6.
472 The former operator strips leading zeroes and collapses the longest
473 set of 0-groups to a double-colon.
475 5. New "-bP config" support, to dump the effective configuration.
477 6. New $dkim_key_length variable.
479 7. New base64d and base64 expansion items (the existing str2b64 being a
480 synonym of the latter). Add support in base64 for certificates.
482 8. New main configuration option "bounce_return_linesize_limit" to
483 avoid oversize bodies in bounces. The default value matches RFC
486 9. New $initial_cwd expansion variable.
492 1. Support for using the system standard CA bundle.
494 2. New expansion items $config_file, $config_dir, containing the file
495 and directory name of the main configuration file. Also $exim_version.
497 3. New "malware=" support for Avast.
499 4. New "spam=" variant option for Rspamd.
501 5. Assorted options on malware= and spam= scanners.
503 6. A command-line option to write a comment into the logfile.
505 7. If built with EXPERIMENTAL_SOCKS feature enabled, the smtp transport can
506 be configured to make connections via socks5 proxies.
508 8. If built with EXPERIMENTAL_INTERNATIONAL, support is included for
509 the transmission of UTF-8 envelope addresses.
511 9. If built with EXPERIMENTAL_INTERNATIONAL, an expansion item for a commonly
512 used encoding of Maildir folder names.
514 10. A logging option for slow DNS lookups.
516 11. New ${env {<variable>}} expansion.
518 12. A non-SMTP authenticator using information from TLS client certificates.
520 13. Main option "tls_eccurve" for selecting an Elliptic Curve for TLS.
521 Patch originally by Wolfgang Breyha.
523 14. Main option "dns_trust_aa" for trusting your local nameserver at the
524 same level as DNSSEC.
529 1. If built with EXPERIMENTAL_DANE feature enabled, Exim will follow the
530 DANE SMTP draft to assess a secure chain of trust of the certificate
531 used to establish the TLS connection based on a TLSA record in the
532 domain of the sender.
534 2. The EXPERIMENTAL_TPDA feature has been renamed to EXPERIMENTAL_EVENT
535 and several new events have been created. The reason is because it has
536 been expanded beyond just firing events during the transport phase. Any
537 existing TPDA transport options will have to be rewritten to use a new
538 $event_name expansion variable in a condition. Refer to the
539 experimental-spec.txt for details and examples.
541 3. The EXPERIMENTAL_CERTNAMES features is an enhancement to verify that
542 server certs used for TLS match the result of the MX lookup. It does
543 not use the same mechanism as DANE.
553 1. If built with the EXPERIMENTAL_PROXY feature enabled, Exim can be
554 configured to expect an initial header from a proxy that will make the
555 actual external source IP:host be used in exim instead of the IP of the
556 proxy that is connecting to it.
558 2. New verify option header_names_ascii, which will check to make sure
559 there are no non-ASCII characters in header names. Exim itself handles
560 those non-ASCII characters, but downstream apps may not, so Exim can
561 detect and reject if those characters are present.
563 3. New expansion operator ${utf8clean:string} to replace malformed UTF8
564 codepoints with valid ones.
566 4. New malware type "sock". Talks over a Unix or TCP socket, sending one
567 command line and matching a regex against the return data for trigger
568 and a second regex to extract malware_name. The mail spoolfile name can
569 be included in the command line.
571 5. The smtp transport now supports options "tls_verify_hosts" and
572 "tls_try_verify_hosts". If either is set the certificate verification
573 is split from the encryption operation. The default remains that a failed
574 verification cancels the encryption.
576 6. New SERVERS override of default ldap server list. In the ACLs, an ldap
577 lookup can now set a list of servers to use that is different from the
580 7. New command-line option -C for exiqgrep to specify alternate exim.conf
581 file when searching the queue.
583 8. OCSP now supports GnuTLS also, if you have version 3.1.3 or later of that.
585 9. Support for DNSSEC on outbound connections.
587 10. New variables "tls_(in,out)_(our,peer)cert" and expansion item
588 "certextract" to extract fields from them. Hash operators md5 and sha1
589 work over them for generating fingerprints, and a new sha256 operator
592 11. PRDR is now supported dy default.
594 12. OCSP stapling is now supported by default.
596 13. If built with the EXPERIMENTAL_DSN feature enabled, Exim will output
597 Delivery Status Notification messages in MIME format, and negotiate
598 DSN features per RFC 3461.
604 1. New command-line option -bI:sieve will list all supported sieve extensions
605 of this Exim build on standard output, one per line.
606 ManageSieve (RFC 5804) providers managing scripts for use by Exim should
607 query this to establish the correct list to include in the protocol's
608 SIEVE capability line.
610 2. If the -n option is combined with the -bP option, then the name of an
611 emitted option is not output, only the value (if visible to you).
612 For instance, "exim -n -bP pid_file_path" should just emit a pathname
613 followed by a newline, and no other text.
615 3. When built with SUPPORT_TLS and USE_GNUTLS, the SMTP transport driver now
616 has a "tls_dh_min_bits" option, to set the minimum acceptable number of
617 bits in the Diffie-Hellman prime offered by a server (in DH ciphersuites)
618 acceptable for security. (Option accepted but ignored if using OpenSSL).
619 Defaults to 1024, the old value. May be lowered only to 512, or raised as
620 far as you like. Raising this may hinder TLS interoperability with other
621 sites and is not currently recommended. Lowering this will permit you to
622 establish a TLS session which is not as secure as you might like.
624 Unless you really know what you are doing, leave it alone.
626 4. If not built with DISABLE_DNSSEC, Exim now has the main option
627 dns_dnssec_ok; if set to 1 then Exim will initialise the resolver library
628 to send the DO flag to your recursive resolver. If you have a recursive
629 resolver, which can set the Authenticated Data (AD) flag in results, Exim
630 can now detect this. Exim does not perform validation itself, instead
631 relying upon a trusted path to the resolver.
633 Current status: work-in-progress; $sender_host_dnssec variable added.
635 5. DSCP support for outbound connections: on a transport using the smtp driver,
636 set "dscp = ef", for instance, to cause the connections to have the relevant
637 DSCP (IPv4 TOS or IPv6 TCLASS) value in the header.
639 Similarly for inbound connections, there is a new control modifier, dscp,
640 so "warn control = dscp/ef" in the connect ACL, or after authentication.
642 Supported values depend upon system libraries. "exim -bI:dscp" to list the
643 ones Exim knows of. You can also set a raw number 0..0x3F.
645 6. The -G command-line flag is no longer ignored; it is now equivalent to an
646 ACL setting "control = suppress_local_fixups". The -L command-line flag
647 is now accepted and forces use of syslog, with the provided tag as the
648 process name. A few other flags used by Sendmail are now accepted and
651 7. New cutthrough routing feature. Requested by a "control = cutthrough_delivery"
652 ACL modifier; works for single-recipient mails which are received on and
653 deliverable via SMTP. Using the connection made for a recipient verify,
654 if requested before the verify, or a new one made for the purpose while
655 the inbound connection is still active. The bulk of the mail item is copied
656 direct from the inbound socket to the outbound (as well as the spool file).
657 When the source notifies the end of data, the data acceptance by the destination
658 is negotiated before the acceptance is sent to the source. If the destination
659 does not accept the mail item, for example due to content-scanning, the item
660 is not accepted from the source and therefore there is no need to generate
661 a bounce mail. This is of benefit when providing a secondary-MX service.
662 The downside is that delays are under the control of the ultimate destination
665 The Received-by: header on items delivered by cutthrough is generated
666 early in reception rather than at the end; this will affect any timestamp
667 included. The log line showing delivery is recorded before that showing
668 reception; it uses a new ">>" tag instead of "=>".
670 To support the feature, verify-callout connections can now use ESMTP and TLS.
671 The usual smtp transport options are honoured, plus a (new, default everything)
672 hosts_verify_avoid_tls.
674 New variable families named tls_in_cipher, tls_out_cipher etc. are introduced
675 for specific access to the information for each connection. The old names
676 are present for now but deprecated.
678 Not yet supported: IGNOREQUOTA, SIZE, PIPELINING.
680 8. New expansion operators ${listnamed:name} to get the content of a named list
681 and ${listcount:string} to count the items in a list.
683 9. New global option "gnutls_allow_auto_pkcs11", defaults false. The GnuTLS
684 rewrite in 4.80 combines with GnuTLS 2.12.0 or later, to autoload PKCS11
685 modules. For some situations this is desirable, but we expect admin in
686 those situations to know they want the feature. More commonly, it means
687 that GUI user modules get loaded and are broken by the setuid Exim being
688 unable to access files specified in environment variables and passed
689 through, thus breakage. So we explicitly inhibit the PKCS11 initialisation
690 unless this new option is set.
692 Some older OS's with earlier versions of GnuTLS might not have pkcs11 ability,
693 so have also added a build option which can be used to build Exim with GnuTLS
694 but without trying to use any kind of PKCS11 support. Uncomment this in the
697 AVOID_GNUTLS_PKCS11=yes
699 10. The "acl = name" condition on an ACL now supports optional arguments.
700 New expansion item "${acl {name}{arg}...}" and expansion condition
701 "acl {{name}{arg}...}" are added. In all cases up to nine arguments
702 can be used, appearing in $acl_arg1 to $acl_arg9 for the called ACL.
703 Variable $acl_narg contains the number of arguments. If the ACL sets
704 a "message =" value this becomes the result of the expansion item,
705 or the value of $value for the expansion condition. If the ACL returns
706 accept the expansion condition is true; if reject, false. A defer
707 return results in a forced fail.
709 11. Routers and transports can now have multiple headers_add and headers_remove
710 option lines. The concatenated list is used.
712 12. New ACL modifier "remove_header" can remove headers before message gets
713 handled by routers/transports.
715 13. New dnsdb lookup pseudo-type "a+". A sequence of "a6" (if configured),
716 "aaaa" and "a" lookups is done and the full set of results returned.
718 14. New expansion variable $headers_added with content from ACL add_header
719 modifier (but not yet added to message).
721 15. New 8bitmime status logging option for received messages. Log field "M8S".
723 16. New authenticated_sender logging option, adding to log field "A".
725 17. New expansion variables $router_name and $transport_name. Useful
726 particularly for debug_print as -bt command-line option does not
727 require privilege whereas -d does.
729 18. If built with EXPERIMENTAL_PRDR, per-recipient data responses per a
730 proposed extension to SMTP from Eric Hall.
732 19. The pipe transport has gained the force_command option, to allow
733 decorating commands from user .forward pipe aliases with prefix
734 wrappers, for instance.
736 20. Callout connections can now AUTH; the same controls as normal delivery
739 21. Support for DMARC, using opendmarc libs, can be enabled. It adds new
740 options: dmarc_forensic_sender, dmarc_history_file, and dmarc_tld_file.
741 It adds new expansion variables $dmarc_ar_header, $dmarc_status,
742 $dmarc_status_text, and $dmarc_used_domain. It adds a new acl modifier
743 dmarc_status. It adds new control flags dmarc_disable_verify and
744 dmarc_enable_forensic. The default for the dmarc_tld_file option is
745 "/etc/exim/opendmarc.tlds" and can be changed via EDITME.
747 22. Add expansion variable $authenticated_fail_id, which is the username
748 provided to the authentication method which failed. It is available
749 for use in subsequent ACL processing (typically quit or notquit ACLs).
751 23. New ACL modifier "udpsend" can construct a UDP packet to send to a given
754 24. New ${hexquote:..string..} expansion operator converts non-printable
755 characters in the string to \xNN form.
757 25. Experimental TPDA (Transport Post Delivery Action) function added.
758 Patch provided by Axel Rau.
760 26. Experimental Redis lookup added. Patch provided by Warren Baker.
766 1. New authenticator driver, "gsasl". Server-only (at present).
767 This is a SASL interface, licensed under GPL, which can be found at
768 http://www.gnu.org/software/gsasl/.
769 This system does not provide sources of data for authentication, so
770 careful use needs to be made of the conditions in Exim.
772 2. New authenticator driver, "heimdal_gssapi". Server-only.
773 A replacement for using cyrus_sasl with Heimdal, now that $KRB5_KTNAME
774 is no longer honoured for setuid programs by Heimdal. Use the
775 "server_keytab" option to point to the keytab.
777 3. The "pkg-config" system can now be used when building Exim to reference
778 cflags and library information for lookups and authenticators, rather
779 than having to update "CFLAGS", "AUTH_LIBS", "LOOKUP_INCLUDE" and
780 "LOOKUP_LIBS" directly. Similarly for handling the TLS library support
781 without adjusting "TLS_INCLUDE" and "TLS_LIBS".
783 In addition, setting PCRE_CONFIG=yes will query the pcre-config tool to
784 find the headers and libraries for PCRE.
786 4. New expansion variable $tls_bits.
788 5. New lookup type, "dbmjz". Key is an Exim list, the elements of which will
789 be joined together with ASCII NUL characters to construct the key to pass
790 into the DBM library. Can be used with gsasl to access sasldb2 files as
793 6. OpenSSL now supports TLS1.1 and TLS1.2 with OpenSSL 1.0.1.
795 Avoid release 1.0.1a if you can. Note that the default value of
796 "openssl_options" is no longer "+dont_insert_empty_fragments", as that
797 increased susceptibility to attack. This may still have interoperability
798 implications for very old clients (see version 4.31 change 37) but
799 administrators can choose to make the trade-off themselves and restore
800 compatibility at the cost of session security.
802 7. Use of the new expansion variable $tls_sni in the main configuration option
803 tls_certificate will cause Exim to re-expand the option, if the client
804 sends the TLS Server Name Indication extension, to permit choosing a
805 different certificate; tls_privatekey will also be re-expanded. You must
806 still set these options to expand to valid files when $tls_sni is not set.
808 The SMTP Transport has gained the option tls_sni, which will set a hostname
809 for outbound TLS sessions, and set $tls_sni too.
811 A new log_selector, +tls_sni, has been added, to log received SNI values
812 for Exim as a server.
814 8. The existing "accept_8bitmime" option now defaults to true. This means
815 that Exim is deliberately not strictly RFC compliant. We're following
816 Dan Bernstein's advice in http://cr.yp.to/smtp/8bitmime.html by default.
817 Those who disagree, or know that they are talking to mail servers that,
818 even today, are not 8-bit clean, need to turn off this option.
820 9. Exim can now be started with -bw (with an optional timeout, given as
821 -bw<timespec>). With this, stdin at startup is a socket that is
822 already listening for connections. This has a more modern name of
823 "socket activation", but forcing the activated socket to fd 0. We're
824 interested in adding more support for modern variants.
826 10. ${eval } now uses 64-bit values on supporting platforms. A new "G" suffix
827 for numbers indicates multiplication by 1024^3.
829 11. The GnuTLS support has been revamped; the three options gnutls_require_kx,
830 gnutls_require_mac & gnutls_require_protocols are no longer supported.
831 tls_require_ciphers is now parsed by gnutls_priority_init(3) as a priority
832 string, documentation for which is at:
833 http://www.gnutls.org/manual/html_node/Priority-Strings.html
835 SNI support has been added to Exim's GnuTLS integration too.
837 For sufficiently recent GnuTLS libraries, ${randint:..} will now use
838 gnutls_rnd(), asking for GNUTLS_RND_NONCE level randomness.
840 12. With OpenSSL, if built with EXPERIMENTAL_OCSP, a new option tls_ocsp_file
841 is now available. If the contents of the file are valid, then Exim will
842 send that back in response to a TLS status request; this is OCSP Stapling.
843 Exim will not maintain the contents of the file in any way: administrators
844 are responsible for ensuring that it is up-to-date.
846 See "experimental-spec.txt" for more details.
848 13. ${lookup dnsdb{ }} supports now SPF record types. They are handled
849 identically to TXT record lookups.
851 14. New expansion variable $tod_epoch_l for higher-precision time.
853 15. New global option tls_dh_max_bits, defaulting to current value of NSS
854 hard-coded limit of DH ephemeral bits, to fix interop problems caused by
855 GnuTLS 2.12 library recommending a bit count higher than NSS supports.
857 16. tls_dhparam now used by both OpenSSL and GnuTLS, can be path or identifier.
858 Option can now be a path or an identifier for a standard prime.
859 If unset, we use the DH prime from section 2.2 of RFC 5114, "ike23".
860 Set to "historic" to get the old GnuTLS behaviour of auto-generated DH
863 17. SSLv2 now disabled by default in OpenSSL. (Never supported by GnuTLS).
864 Use "openssl_options -no_sslv2" to re-enable support, if your OpenSSL
865 install was not built with OPENSSL_NO_SSL2 ("no-ssl2").
871 1. New options for the ratelimit ACL condition: /count= and /unique=.
872 The /noupdate option has been replaced by a /readonly option.
874 2. The SMTP transport's protocol option may now be set to "smtps", to
875 use SSL-on-connect outbound.
877 3. New variable $av_failed, set true if the AV scanner deferred; ie, when
878 there is a problem talking to the AV scanner, or the AV scanner running.
880 4. New expansion conditions, "inlist" and "inlisti", which take simple lists
881 and check if the search item is a member of the list. This does not
882 support named lists, but does subject the list part to string expansion.
884 5. Unless the new EXPAND_LISTMATCH_RHS build option is set when Exim was
885 built, Exim no longer performs string expansion on the second string of
886 the match_* expansion conditions: "match_address", "match_domain",
887 "match_ip" & "match_local_part". Named lists can still be used.
893 1. The global option "dns_use_edns0" may be set to coerce EDNS0 usage on
894 or off in the resolver library.
900 1. In addition to the existing LDAP and LDAP/SSL ("ldaps") support, there
901 is now LDAP/TLS support, given sufficiently modern OpenLDAP client
902 libraries. The following global options have been added in support of
903 this: ldap_ca_cert_dir, ldap_ca_cert_file, ldap_cert_file, ldap_cert_key,
904 ldap_cipher_suite, ldap_require_cert, ldap_start_tls.
906 2. The pipe transport now takes a boolean option, "freeze_signal", default
907 false. When true, if the external delivery command exits on a signal then
908 Exim will freeze the message in the queue, instead of generating a bounce.
910 3. Log filenames may now use %M as an escape, instead of %D (still available).
911 The %M pattern expands to yyyymm, providing month-level resolution.
913 4. The $message_linecount variable is now updated for the maildir_tag option,
914 in the same way as $message_size, to reflect the real number of lines,
915 including any header additions or removals from transport.
917 5. When contacting a pool of SpamAssassin servers configured in spamd_address,
918 Exim now selects entries randomly, to better scale in a cluster setup.
924 1. SECURITY FIX: privilege escalation flaw fixed. On Linux (and only Linux)
925 the flaw permitted the Exim run-time user to cause root to append to
926 arbitrary files of the attacker's choosing, with the content based
927 on content supplied by the attacker.
929 2. Exim now supports loading some lookup types at run-time, using your
930 platform's dlopen() functionality. This has limited platform support
931 and the intention is not to support every variant, it's limited to
932 dlopen(). This permits the main Exim binary to not be linked against
933 all the libraries needed for all the lookup types.
939 NOTE: this version is not guaranteed backwards-compatible, please read the
940 items below carefully
942 1. A new main configuration option, "openssl_options", is available if Exim
943 is built with SSL support provided by OpenSSL. The option allows
944 administrators to specify OpenSSL options to be used on connections;
945 typically this is to set bug compatibility features which the OpenSSL
946 developers have not enabled by default. There may be security
947 consequences for certain options, so these should not be changed
950 2. A new pipe transport option, "permit_coredumps", may help with problem
951 diagnosis in some scenarios. Note that Exim is typically installed as
952 a setuid binary, which on most OSes will inhibit coredumps by default,
953 so that safety mechanism would have to be overridden for this option to
954 be able to take effect.
956 3. ClamAV 0.95 is now required for ClamAV support in Exim, unless
957 Local/Makefile sets: WITH_OLD_CLAMAV_STREAM=yes
958 Note that this switches Exim to use a new API ("INSTREAM") and a future
959 release of ClamAV will remove support for the old API ("STREAM").
961 The av_scanner option, when set to "clamd", now takes an optional third
962 part, "local", which causes Exim to pass a filename to ClamAV instead of
963 the file content. This is the same behaviour as when clamd is pointed at
964 a Unix-domain socket. For example:
966 av_scanner = clamd:192.0.2.3 1234:local
968 ClamAV's ExtendedDetectionInfo response format is now handled.
970 4. There is now a -bmalware option, restricted to admin users. This option
971 takes one parameter, a filename, and scans that file with Exim's
972 malware-scanning framework. This is intended purely as a debugging aid
973 to ensure that Exim's scanning is working, not to replace other tools.
974 Note that the ACL framework is not invoked, so if av_scanner references
975 ACL variables without a fallback then this will fail.
977 5. There is a new expansion operator, "reverse_ip", which will reverse IP
978 addresses; IPv4 into dotted quad, IPv6 into dotted nibble. Examples:
980 ${reverse_ip:192.0.2.4}
982 ${reverse_ip:2001:0db8:c42:9:1:abcd:192.0.2.3}
983 -> 3.0.2.0.0.0.0.c.d.c.b.a.1.0.0.0.9.0.0.0.2.4.c.0.8.b.d.0.1.0.0.2
985 6. There is a new ACL control called "debug", to enable debug logging.
986 This allows selective logging of certain incoming transactions within
987 production environments, with some care. It takes two options, "tag"
988 and "opts"; "tag" is included in the filename of the log and "opts"
989 is used as per the -d<options> command-line option. Examples, which
990 don't all make sense in all contexts:
993 control = debug/tag=.$sender_host_address
994 control = debug/opts=+expand+acl
995 control = debug/tag=.$message_exim_id/opts=+expand
997 7. It has always been implicit in the design and the documentation that
998 "the Exim user" is not root. src/EDITME said that using root was
999 "very strongly discouraged". This is not enough to keep people from
1000 shooting themselves in the foot in days when many don't configure Exim
1001 themselves but via package build managers. The security consequences of
1002 running various bits of network code are severe if there should be bugs in
1003 them. As such, the Exim user may no longer be root. If configured
1004 statically, Exim will refuse to build. If configured as ref:user then Exim
1005 will exit shortly after start-up. If you must shoot yourself in the foot,
1006 then henceforth you will have to maintain your own local patches to strip
1009 8. There is a new expansion condition, bool_lax{}. Where bool{} uses the ACL
1010 condition logic to determine truth/failure and will fail to expand many
1011 strings, bool_lax{} uses the router condition logic, where most strings
1013 Note: bool{00} is false, bool_lax{00} is true.
1015 9. Routers now support multiple "condition" tests.
1017 10. There is now a runtime configuration option "tcp_wrappers_daemon_name".
1018 Setting this allows an admin to define which entry in the tcpwrappers
1019 config file will be used to control access to the daemon. This option
1020 is only available when Exim is built with USE_TCP_WRAPPERS. The
1021 default value is set at build time using the TCP_WRAPPERS_DAEMON_NAME
1024 11. [POSSIBLE CONFIG BREAKAGE] The default value for system_filter_user is now
1025 the Exim run-time user, instead of root.
1027 12. [POSSIBLE CONFIG BREAKAGE] ALT_CONFIG_ROOT_ONLY is no longer optional and
1028 is forced on. This is mitigated by the new build option
1029 TRUSTED_CONFIG_LIST which defines a list of configuration files which
1030 are trusted; one per line. If a config file is owned by root and matches
1031 a pathname in the list, then it may be invoked by the Exim build-time
1032 user without Exim relinquishing root privileges.
1034 13. [POSSIBLE CONFIG BREAKAGE] The Exim user is no longer automatically
1035 trusted to supply -D<Macro[=Value]> overrides on the command-line. Going
1036 forward, we recommend using TRUSTED_CONFIG_LIST with shim configs that
1037 include the main config. As a transition mechanism, we are temporarily
1038 providing a work-around: the new build option WHITELIST_D_MACROS provides
1039 a colon-separated list of macro names which may be overridden by the Exim
1040 run-time user. The values of these macros are constrained to the regex
1041 ^[A-Za-z0-9_/.-]*$ (which explicitly does allow for empty values).
1047 1. TWO SECURITY FIXES: one relating to mail-spools which are globally
1048 writable, the other to locking of MBX folders (not mbox).
1050 2. MySQL stored procedures are now supported.
1052 3. The dkim_domain transport option is now a list, not a single string, and
1053 messages will be signed for each element in the list (discarding
1056 4. The 4.70 release unexpectedly changed the behaviour of dnsdb TXT lookups
1057 in the presence of multiple character strings within the RR. Prior to 4.70,
1058 only the first string would be returned. The dnsdb lookup now, by default,
1059 preserves the pre-4.70 semantics, but also now takes an extended output
1060 separator specification. The separator can be followed by a semicolon, to
1061 concatenate the individual text strings together with no join character,
1062 or by a comma and a second separator character, in which case the text
1063 strings within a TXT record are joined on that second character.
1064 Administrators are reminded that DNS provides no ordering guarantees
1065 between multiple records in an RRset. For example:
1067 foo.example. IN TXT "a" "b" "c"
1068 foo.example. IN TXT "d" "e" "f"
1070 ${lookup dnsdb{>/ txt=foo.example}} -> "a/d"
1071 ${lookup dnsdb{>/; txt=foo.example}} -> "def/abc"
1072 ${lookup dnsdb{>/,+ txt=foo.example}} -> "a+b+c/d+e+f"
1078 1. Native DKIM support without an external library.
1079 (Note that if no action to prevent it is taken, a straight upgrade will
1080 result in DKIM verification of all signed incoming emails. See spec
1081 for details on conditionally disabling)
1083 2. Experimental DCC support via dccifd (contributed by Wolfgang Breyha).
1085 3. There is now a bool{} expansion condition which maps certain strings to
1086 true/false condition values (most likely of use in conjunction with the
1087 and{} expansion operator).
1089 4. The $spam_score, $spam_bar and $spam_report variables are now available
1092 5. exim -bP now supports "macros", "macro_list" or "macro MACRO_NAME" as
1093 options, provided that Exim is invoked by an admin_user.
1095 6. There is a new option gnutls_compat_mode, when linked against GnuTLS,
1096 which increases compatibility with older clients at the cost of decreased
1097 security. Don't set this unless you need to support such clients.
1099 7. There is a new expansion operator, ${randint:...} which will produce a
1100 "random" number less than the supplied integer. This randomness is
1101 not guaranteed to be cryptographically strong, but depending upon how
1102 Exim was built may be better than the most naive schemes.
1104 8. Exim now explicitly ensures that SHA256 is available when linked against
1107 9. The transport_filter_timeout option now applies to SMTP transports too.
1113 1. Preliminary DKIM support in Experimental.
1119 1. The body_linecount and body_zerocount C variables are now exported in the
1122 2. When a dnslists lookup succeeds, the key that was looked up is now placed
1123 in $dnslist_matched. When the key is an IP address, it is not reversed in
1124 this variable (though it is, of course, in the actual lookup). In simple
1127 deny dnslists = spamhaus.example
1129 the key is also available in another variable (in this case,
1130 $sender_host_address). In more complicated cases, however, this is not
1131 true. For example, using a data lookup might generate a dnslists lookup
1134 deny dnslists = spamhaus.example/<|192.168.1.2|192.168.6.7|...
1136 If this condition succeeds, the value in $dnslist_matched might be
1137 192.168.6.7 (for example).
1139 3. Authenticators now have a client_condition option. When Exim is running as
1140 a client, it skips an authenticator whose client_condition expansion yields
1141 "0", "no", or "false". This can be used, for example, to skip plain text
1142 authenticators when the connection is not encrypted by a setting such as:
1144 client_condition = ${if !eq{$tls_cipher}{}}
1146 Note that the 4.67 documentation states that $tls_cipher contains the
1147 cipher used for incoming messages. In fact, during SMTP delivery, it
1148 contains the cipher used for the delivery. The same is true for
1151 4. There is now a -Mvc <message-id> option, which outputs a copy of the
1152 message to the standard output, in RFC 2822 format. The option can be used
1153 only by an admin user.
1155 5. There is now a /noupdate option for the ratelimit ACL condition. It
1156 computes the rate and checks the limit as normal, but it does not update
1157 the saved data. This means that, in relevant ACLs, it is possible to lookup
1158 the existence of a specified (or auto-generated) ratelimit key without
1159 incrementing the ratelimit counter for that key.
1161 In order for this to be useful, another ACL entry must set the rate
1162 for the same key somewhere (otherwise it will always be zero).
1167 # Read the rate; if it doesn't exist or is below the maximum
1168 # we update it below
1169 deny ratelimit = 100 / 5m / strict / noupdate
1170 log_message = RATE: $sender_rate / $sender_rate_period \
1171 (max $sender_rate_limit)
1173 [... some other logic and tests...]
1175 warn ratelimit = 100 / 5m / strict / per_cmd
1176 log_message = RATE UPDATE: $sender_rate / $sender_rate_period \
1177 (max $sender_rate_limit)
1178 condition = ${if le{$sender_rate}{$sender_rate_limit}}
1182 6. The variable $max_received_linelength contains the number of bytes in the
1183 longest line that was received as part of the message, not counting the
1184 line termination character(s).
1186 7. Host lists can now include +ignore_defer and +include_defer, analogous to
1187 +ignore_unknown and +include_unknown. These options should be used with
1188 care, probably only in non-critical host lists such as whitelists.
1190 8. There's a new option called queue_only_load_latch, which defaults true.
1191 If set false when queue_only_load is greater than zero, Exim re-evaluates
1192 the load for each incoming message in an SMTP session. Otherwise, once one
1193 message is queued, the remainder are also.
1195 9. There is a new ACL, specified by acl_smtp_notquit, which is run in most
1196 cases when an SMTP session ends without sending QUIT. However, when Exim
1197 itself is in bad trouble, such as being unable to write to its log files,
1198 this ACL is not run, because it might try to do things (such as write to
1199 log files) that make the situation even worse.
1201 Like the QUIT ACL, this new ACL is provided to make it possible to gather
1202 statistics. Whatever it returns (accept or deny) is immaterial. The "delay"
1203 modifier is forbidden in this ACL.
1205 When the NOTQUIT ACL is running, the variable $smtp_notquit_reason is set
1206 to a string that indicates the reason for the termination of the SMTP
1207 connection. The possible values are:
1209 acl-drop Another ACL issued a "drop" command
1210 bad-commands Too many unknown or non-mail commands
1211 command-timeout Timeout while reading SMTP commands
1212 connection-lost The SMTP connection has been lost
1213 data-timeout Timeout while reading message data
1214 local-scan-error The local_scan() function crashed
1215 local-scan-timeout The local_scan() function timed out
1216 signal-exit SIGTERM or SIGINT
1217 synchronization-error SMTP synchronization error
1218 tls-failed TLS failed to start
1220 In most cases when an SMTP connection is closed without having received
1221 QUIT, Exim sends an SMTP response message before actually closing the
1222 connection. With the exception of acl-drop, the default message can be
1223 overridden by the "message" modifier in the NOTQUIT ACL. In the case of a
1224 "drop" verb in another ACL, it is the message from the other ACL that is
1227 10. For MySQL and PostgreSQL lookups, it is now possible to specify a list of
1228 servers with individual queries. This is done by starting the query with
1229 "servers=x:y:z;", where each item in the list may take one of two forms:
1231 (1) If it is just a host name, the appropriate global option (mysql_servers
1232 or pgsql_servers) is searched for a host of the same name, and the
1233 remaining parameters (database, user, password) are taken from there.
1235 (2) If it contains any slashes, it is taken as a complete parameter set.
1237 The list of servers is used in exactly the same was as the global list.
1238 Once a connection to a server has happened and a query has been
1239 successfully executed, processing of the lookup ceases.
1241 This feature is intended for use in master/slave situations where updates
1242 are occurring, and one wants to update a master rather than a slave. If the
1243 masters are in the list for reading, you might have:
1245 mysql_servers = slave1/db/name/pw:slave2/db/name/pw:master/db/name/pw
1247 In an updating lookup, you could then write
1249 ${lookup mysql{servers=master; UPDATE ...}
1251 If, on the other hand, the master is not to be used for reading lookups:
1253 pgsql_servers = slave1/db/name/pw:slave2/db/name/pw
1255 you can still update the master by
1257 ${lookup pgsql{servers=master/db/name/pw; UPDATE ...}
1259 11. The message_body_newlines option (default FALSE, for backwards
1260 compatibility) can be used to control whether newlines are present in
1261 $message_body and $message_body_end. If it is FALSE, they are replaced by
1268 1. There is a new log selector called smtp_no_mail, which is not included in
1269 the default setting. When it is set, a line is written to the main log
1270 whenever an accepted SMTP connection terminates without having issued a
1273 2. When an item in a dnslists list is followed by = and & and a list of IP
1274 addresses, the behaviour was not clear when the lookup returned more than
1275 one IP address. This has been solved by the addition of == and =& for "all"
1276 rather than the default "any" matching.
1278 3. Up till now, the only control over which cipher suites GnuTLS uses has been
1279 for the cipher algorithms. New options have been added to allow some of the
1280 other parameters to be varied.
1282 4. There is a new compile-time option called ENABLE_DISABLE_FSYNC. When it is
1283 set, Exim compiles a runtime option called disable_fsync.
1285 5. There is a new variable called $smtp_count_at_connection_start.
1287 6. There's a new control called no_pipelining.
1289 7. There are two new variables called $sending_ip_address and $sending_port.
1290 These are set whenever an SMTP connection to another host has been set up.
1292 8. The expansion of the helo_data option in the smtp transport now happens
1293 after the connection to the server has been made.
1295 9. There is a new expansion operator ${rfc2047d: that decodes strings that
1296 are encoded as per RFC 2047.
1298 10. There is a new log selector called "pid", which causes the current process
1299 id to be added to every log line, in square brackets, immediately after the
1302 11. Exim has been modified so that it flushes SMTP output before implementing
1303 a delay in an ACL. It also flushes the output before performing a callout,
1304 as this can take a substantial time. These behaviours can be disabled by
1305 obeying control = no_delay_flush or control = no_callout_flush,
1306 respectively, at some earlier stage of the connection.
1308 12. There are two new expansion conditions that iterate over a list. They are
1309 called forany and forall.
1311 13. There's a new global option called dsn_from that can be used to vary the
1312 contents of From: lines in bounces and other automatically generated
1313 messages ("delivery status notifications" - hence the name of the option).
1315 14. The smtp transport has a new option called hosts_avoid_pipelining.
1317 15. By default, exigrep does case-insensitive matches. There is now a -I option
1318 that makes it case-sensitive.
1320 16. A number of new features ("addresses", "map", "filter", and "reduce") have
1321 been added to string expansions to make it easier to process lists of
1322 items, typically addresses.
1324 17. There's a new ACL modifier called "continue". It does nothing of itself,
1325 and processing of the ACL always continues with the next condition or
1326 modifier. It is provided so that the side effects of expanding its argument
1329 18. It is now possible to use newline and other control characters (those with
1330 values less than 32, plus DEL) as separators in lists.
1332 19. The exigrep utility now has a -v option, which inverts the matching
1335 20. The host_find_failed option in the manualroute router can now be set to
1342 No new features were added to 4.66.
1348 No new features were added to 4.65.
1354 1. ACL variables can now be given arbitrary names, as long as they start with
1355 "acl_c" or "acl_m" (for connection variables and message variables), are at
1356 least six characters long, with the sixth character being either a digit or
1359 2. There is a new ACL modifier called log_reject_target. It makes it possible
1360 to specify which logs are used for messages about ACL rejections.
1362 3. There is a new authenticator called "dovecot". This is an interface to the
1363 authentication facility of the Dovecot POP/IMAP server, which can support a
1364 number of authentication methods.
1366 4. The variable $message_headers_raw provides a concatenation of all the
1367 messages's headers without any decoding. This is in contrast to
1368 $message_headers, which does RFC2047 decoding on the header contents.
1370 5. In a DNS black list, if two domain names, comma-separated, are given, the
1371 second is used first to do an initial check, making use of any IP value
1372 restrictions that are set. If there is a match, the first domain is used,
1373 without any IP value restrictions, to get the TXT record.
1375 6. All authenticators now have a server_condition option.
1377 7. There is a new command-line option called -Mset. It is useful only in
1378 conjunction with -be (that is, when testing string expansions). It must be
1379 followed by a message id; Exim loads the given message from its spool
1380 before doing the expansions.
1382 8. Another similar new command-line option is called -bem. It operates like
1383 -be except that it must be followed by the name of a file that contains a
1386 9. When an address is delayed because of a 4xx response to a RCPT command, it
1387 is now the combination of sender and recipient that is delayed in
1388 subsequent queue runs until its retry time is reached.
1390 10. Unary negation and the bitwise logical operators and, or, xor, not, and
1391 shift, have been added to the eval: and eval10: expansion items.
1393 11. The variables $interface_address and $interface_port have been renamed
1394 as $received_ip_address and $received_port, to make it clear that they
1395 relate to message reception rather than delivery. (The old names remain
1396 available for compatibility.)
1398 12. The "message" modifier can now be used on "accept" and "discard" acl verbs
1399 to vary the message that is sent when an SMTP command is accepted.
1405 1. There is a new Boolean option called filter_prepend_home for the redirect
1408 2. There is a new acl, set by acl_not_smtp_start, which is run right at the
1409 start of receiving a non-SMTP message, before any of the message has been
1412 3. When an SMTP error message is specified in a "message" modifier in an ACL,
1413 or in a :fail: or :defer: message in a redirect router, Exim now checks the
1414 start of the message for an SMTP error code.
1416 4. There is a new parameter for LDAP lookups called "referrals", which takes
1417 one of the settings "follow" (the default) or "nofollow".
1419 5. Version 20070721.2 of exipick now included, offering these new options:
1421 After all other sorting options have bee processed, reverse order
1422 before displaying messages (-R is synonym).
1424 Randomize order of matching messages before displaying.
1426 Instead of displaying the matching messages, display the sum
1428 --sort <variable>[,<variable>...]
1429 Before displaying matching messages, sort the messages according to
1430 each messages value for each variable.
1432 Negate the value for every test (returns inverse output from the
1433 same criteria without --not).
1439 1. The ${readsocket expansion item now supports Internet domain sockets as well
1440 as Unix domain sockets. If the first argument begins "inet:", it must be of
1441 the form "inet:host:port". The port is mandatory; it may be a number or the
1442 name of a TCP port in /etc/services. The host may be a name, or it may be an
1443 IP address. An ip address may optionally be enclosed in square brackets.
1444 This is best for IPv6 addresses. For example:
1446 ${readsocket{inet:[::1]:1234}{<request data>}...
1448 Only a single host name may be given, but if looking it up yield more than
1449 one IP address, they are each tried in turn until a connection is made. Once
1450 a connection has been made, the behaviour is as for ${readsocket with a Unix
1453 2. If a redirect router sets up file or pipe deliveries for more than one
1454 incoming address, and the relevant transport has batch_max set greater than
1455 one, a batch delivery now occurs.
1457 3. The appendfile transport has a new option called maildirfolder_create_regex.
1458 Its value is a regular expression. For a maildir delivery, this is matched
1459 against the maildir directory; if it matches, Exim ensures that a
1460 maildirfolder file is created alongside the new, cur, and tmp directories.
1466 The documentation is up-to-date for the 4.61 release. Major new features since
1467 the 4.60 release are:
1469 . An option called disable_ipv6, to disable the use of IPv6 completely.
1471 . An increase in the number of ACL variables to 20 of each type.
1473 . A change to use $auth1, $auth2, and $auth3 in authenticators instead of $1,
1474 $2, $3, (though those are still set) because the numeric variables get used
1475 for other things in complicated expansions.
1477 . The default for rfc1413_query_timeout has been changed from 30s to 5s.
1479 . It is possible to use setclassresources() on some BSD OS to control the
1480 resources used in pipe deliveries.
1482 . A new ACL modifier called add_header, which can be used with any verb.
1484 . More errors are detectable in retry rules.
1486 There are a number of other additions too.
1492 The documentation is up-to-date for the 4.60 release. Major new features since
1493 the 4.50 release are:
1495 . Support for SQLite.
1497 . Support for IGNOREQUOTA in LMTP.
1499 . Extensions to the "submission mode" features.
1501 . Support for Client SMTP Authorization (CSA).
1503 . Support for ratelimiting hosts and users.
1505 . New expansion items to help with the BATV "prvs" scheme.
1507 . A "match_ip" condition, that matches an IP address against a list.
1509 There are many more minor changes.