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.
12 1. The fast-ramp two phase queue run support, previously experimental, is
13 now supported by default.
15 2. The native SRS support, previously experimental, is now supported. It is
16 not built unless specified in the Local/Makefile.
18 3. TLS resumption support, previously experimental, is now supported and
19 included in default builds.
21 4. Single-key LMDB lookups, previously experimental, are now supported.
22 The support is not built unless specified in the Local/Makefile.
24 5. Option "message_linelength_limit" on the smtp transport to enforce (by
25 default) the RFC 998 character limit.
27 6. An option to ignore the cache on a lookup.
29 7. Quota checking during reception (i.e. at SMTP time) for appendfile-
30 transport-managed quotas.
32 8. Sqlite lookups accept a "file=<path>" option to specify a per-operation
33 db file, replacing the previous prefix to the SQL string (which had
34 issues when the SQL used tainted values).
36 9. Lsearch lookups accept a "ret=full" option, to return both the portion
37 of the line matching the key, and the remainder.
39 10. A command-line option to have a daemon not create a notifier socket.
41 11. Faster TLS startup. When various configuration options contain no
42 expandable elements, the information can be preloaded and cached rather
43 than the previous behaviour of always loading at startup time for every
44 connection. This helps particularly for the CA bundle.
46 12. Proxy Protocol Timeout is configurable via "proxy_protocol_timeout"
49 13. Option "smtp_accept_max_per_connection" is now expanded.
51 14. Log selector "queue_size_exclusive", enabled by default, to exclude the
52 time taken for reception from QT log elements.
54 15. Main option "smtp_backlog_monitor", to set a level above which listen
55 socket backlogs are logged.
57 16. Main option "hosts_require_helo", requiring HELO or EHLO before MAIL.
59 17. A main config option "allow_insecure_tainted_data" allows to turn
60 taint errors into warnings.
66 1. EXPERIMENTAL_SRS_NATIVE optional build feature. See the experimental.spec
69 2. Channel-binding for authenticators is now supported under OpenSSL.
70 Previously it was GnuTLS-only.
74 4. Client-side support in the gsasl authenticator. Tested against the
75 plaintext driver for PLAIN; only against itself for SCRAM-SHA-1 and
76 SCRAM-SHA-1-PLUS methods.
78 5. Server-side support in the gsasl authenticator for encrypted passwords, as
79 an alternate for the existing plaintext.
81 6. Variable $local_part_data now also set by router check_local_user option,
82 with an de-tainted version of $local_part.
84 7. Named-list definitions can now be prefixed "hide" so that "-bP" commands do
85 not output the content. Previously this could only be done on options.
87 8. As an experimental feature, the dovecot authentication driver supports inet
88 sockets. Previously it was unix-domain sockets only.
90 9. The ACL control "queue_only" can also be spelled "queue", and now takes an
91 option "first_pass_route" to do the same as a "-odqs" on the command line.
93 10. Items specified for the router and transport headers_remove option can use
94 a trailing asterisk to specify globbing.
96 11. New $queue_size variable.
98 12. New variables $local_part_{pre,suf}fix_v.
100 13. New main option "sqlite_dbfile", for use in preference to prefixing the
101 lookup string. The older method fails when tainted variables are used
102 in the lookup, as the filename becomes tainted. The new method keeps the
105 14. Options on the dsearch lookup, to return the full path and to filter
106 filetypes for matching.
108 15. Options on pgsql and mysql lookups, to specify server separate from the
111 16. An option on all single-key lookups, to return (on a hit) a de-tainted
112 version of the lookup key rather than the looked-up data.
114 17. $domain_data and $local_part_data are now set by all list-match successes.
115 Previously only list items that performed lookups did so.
116 Also, matching list items that are tail-match or RE-match now set the
117 numeric variables $0 (etc) in the same way os other RE matches.
119 18. Expansion item ${listquote {<char} {<item>}}.
121 19. An option for the ${readsocket {}{}{}} expansion to make the result data
124 20. dkim_verify_min_keysizes, a list of minimum acceptable public-key sizes.
126 21. bounce_message_file and warn_message_file are now expanded before use.
128 22. New main config option spf_smtp_comment_template to customise the
129 $spf_smtp_comment variable
136 1. An "external" authenticator, per RFC 4422 Appendix A.
138 2. A JSON lookup type, and JSON variants of the forall/any expansion conditions.
140 3. Variables $tls_in_cipher_std, $tls_out_cipher_std giving the RFC names
143 4. Log_selectors "msg_id" (on by default) and "msg_id_created".
145 5. A case_insensitive option for verify=not_blind.
147 6. EXPERIMENTAL_TLS_RESUME optional build feature. See the experimental.spec
150 7. A main option exim_version to override the version Exim
151 reports in verious places ($exim_version, $version_number).
153 8. Expansion operator ${sha2_N:} for N=256, 384, 512.
155 9. Router variables, $r_... settable from router options and usable in routers
158 10. The spf lookup now supports IPv6.
160 11. Main options for DKIM verify to filter hash and key types.
162 12. With TLS1.3, support for full-chain OCSP stapling.
164 13. Dual-certificate stacks on servers now support OCSP stapling, under OpenSSL.
166 14: An smtp:ehlo transport event, for observability of the remote offered features.
168 15: Support under OpenSSL for writing NSS-style key files for packet-capture
169 decode. The environment variable SSLKEYLOGFILE is used; if an absolute path
170 it must indicate a file under the spool directory; if relative the the spool
171 directory is prepended. Works on the server side only. Support under
172 GnuTLS was already there, being done purely by the library (server side
173 only, and exim must be run as root).
175 16: Command-line option to move messages from one named queue to another.
177 17. Variables $tls_in_ver, $tls_out_ver.
183 1. ${l_header:<name>} and ${l_h:<name>} expansion items, giving a colon-sep
184 list when there are multiple headers having a given name. This matters
185 when individual headers are wrapped onto multiple lines; with previous
186 facilities hard to parse.
188 2. The ${readsocket } expansion item now takes a "tls" option, doing the
191 3. EXPERIMENTAL_REQUIRETLS and EXPERIMENTAL_PIPE_CONNECT optional build
192 features. See the experimental.spec file.
194 4. If built with SUPPORT_I18N a "utf8_downconvert" option on the smtp transport.
196 5. A "pipelining" log_selector.
198 6. Builtin macros for supported log_selector and openssl_options values.
200 7. JSON variants of the ${extract } expansion item.
202 8. A "noutf8" debug option, for disabling the UTF-8 characters in debug output.
204 9. TCP Fast Open support on MacOS.
209 1. Dual-certificate stacks on servers now support OCSP stapling, under GnuTLS
210 version 3.5.6 or later.
212 2. DANE is now supported under GnuTLS version 3.0.0 or later. Both GnuTLS and
213 OpenSSL versions are moved to mainline support from Experimental.
214 New SMTP transport option "dane_require_tls_ciphers".
216 3. Feature macros for the compiled-in set of malware scanner interfaces.
218 4. SPF support is promoted from Experimental to mainline status. The template
219 src/EDITME makefile does not enable its inclusion.
221 5. Logging control for DKIM verification. The existing DKIM log line is
222 controlled by a "dkim_verbose" selector which is _not_ enabled by default.
223 A new tag "DKIM=<domain>" is added to <= lines by default, controlled by
224 a "dkim" log_selector.
226 6. Receive duration on <= lines, under a new log_selector "receive_time".
228 7. Options "ipv4_only" and "ipv4_prefer" on the dnslookup router and on
229 routing rules in the manualroute router.
231 8. Expansion item ${sha3:<string>} / ${sha3_<N>:<string>} now also supported
232 under OpenSSL version 1.1.1 or later.
234 9. DKIM operations can now use the Ed25519 algorithm in addition to RSA, under
235 GnuTLS 3.6.0 or OpenSSL 1.1.1 or later.
237 10. Builtin feature-macros _CRYPTO_HASH_SHA3 and _CRYPTO_SIGN_ED25519, library
240 11. "exim -bP macro <name>" returns caller-usable status.
242 12. Expansion item ${authresults {<machine>}} for creating an
243 Authentication-Results: header.
245 13. EXPERIMENTAL_ARC. See the experimental.spec file.
246 See also new util/renew-opendmarc-tlds.sh script for use with DMARC/ARC.
248 14: A dane:fail event, intended to facilitate reporting.
250 15. "Lightweight" support for Redis Cluster. Requires redis_servers list to
251 contain all the servers in the cluster, all of which must be reachable from
252 the running exim instance. If the cluster has master/slave replication, the
253 list must contain all the master and slave servers.
255 16. Add an option to the Avast scanner interface: "pass_unscanned". This
256 allows to treat unscanned files as clean. Files may be unscanned for
257 several reasons: decompression bombs, broken archives.
263 1. PKG_CONFIG_PATH can now be set in Local/Makefile;
264 wildcards will be expanded, values are collapsed.
266 2. The ${readsocket } expansion now takes an option to not shutdown the
267 connection after sending the query string. The default remains to do so.
269 3. An smtp transport option "hosts_noproxy_tls" to control whether multiple
270 deliveries on a single TCP connection can maintain a TLS connection
271 open. By default disabled for all hosts, doing so saves the cost of
272 making new TLS sessions, at the cost of having to proxy the data via
273 another process. Logging is also affected.
275 4. A malware connection type for the FPSCAND protocol.
277 5. An option for recipient verify callouts to hold the connection open for
278 further recipients and for delivery.
280 6. The reproducible build $SOURCE_DATE_EPOCH environment variable is now
283 7. Optionally, an alternate format for spool data-files which matches the
284 wire format - meaning more efficient reception and transmission (at the
285 cost of difficulty with standard Unix tools). Only used for messages
286 received using the ESMTP CHUNKING option, and when a new main-section
287 option "spool_wireformat" (false by default) is set.
289 8. New main configuration option "commandline_checks_require_admin" to
290 restrict who can use various introspection options.
292 9. New option modifier "no_check" for quota and quota_filecount
293 appendfile transport.
295 10. Variable $smtp_command_history returning a comma-sep list of recent
298 11. Millisecond timetamps in logs, on log_selector "millisec". Also affects
299 log elements QT, DT and D, and timstamps in debug output.
301 12. TCP Fast Open logging. As a server, logs when the SMTP banner was sent
302 while still in SYN_RECV state; as a client logs when the connection
303 is opened with a TFO cookie.
305 13. DKIM support for multiple signing, by domain and/or key-selector.
306 DKIM support for multiple hashes, and for alternate-identity tags.
307 Builtin macro with default list of signed headers.
308 Better syntax for specifying oversigning.
309 The DKIM ACL can override verification status, and status is visible in
312 14. Exipick understands -C|--config for an alternative Exim
315 15. TCP Fast Open used, with data-on-SYN, for client SMTP via SOCKS5 proxy,
316 for ${readsocket } expansions, and for ClamAV.
318 16. The "-be" expansion test mode now supports macros. Macros are expanded
319 in test lines, and new macros can be defined.
321 17. Support for server-side dual-certificate-stacks (eg. RSA + ECDSA).
327 1. Allow relative config file names for ".include"
329 2. A main-section config option "debug_store" to control the checks on
330 variable locations during store-reset. Normally false but can be enabled
331 when a memory corruption issue is suspected on a production system.
337 1. The new perl_taintmode option allows to run the embedded perl
338 interpreter in taint mode.
340 2. New log_selector: dnssec, adds a "DS" tag to acceptance and delivery lines.
342 3. Speculative debugging, via a "kill" option to the "control=debug" ACL
345 4. New expansion item ${sha3:<string>} / ${sha3_<N>:<string>}.
346 N can be 224, 256 (default), 384, 512.
347 With GnuTLS 3.5.0 or later, only.
349 5. Facility for named queues: A command-line argument can specify
350 the queue name for a queue operation, and an ACL modifier can set
351 the queue to be used for a message. A $queue_name variable gives
354 6. New expansion operators base32/base32d.
356 7. The CHUNKING ESMTP extension from RFC 3030. May give some slight
357 performance increase and network load decrease. Main config option
358 chunking_advertise_hosts, and smtp transport option hosts_try_chunking
361 8. LMDB lookup support, as Experimental. Patch supplied by Andrew Colin Kissa.
363 9. Expansion operator escape8bit, like escape but not touching newline etc..
365 10. Feature macros, generated from compile options. All start with "_HAVE_"
366 and go on with some roughly recognisable name. Driver macros, for
367 router, transport and authentication drivers; names starting with "_DRIVER_".
368 Option macros, for each configuration-file option; all start with "_OPT_".
369 Use the "-bP macros" command-line option to see what is present.
371 11. Integer values for options can take a "G" multiplier.
373 12. defer=pass option for the ACL control cutthrough_delivery, to reflect 4xx
374 returns from the target back to the initiator, rather than spooling the
377 13. New built-in constants available for tls_dhparam and default changed.
379 14. If built with EXPERIMENTAL_QUEUEFILE, a queuefile transport, for writing
380 out copies of the message spool files for use by 3rd-party scanners.
382 15. A new option on the smtp transport, hosts_try_fastopen. If the system
383 supports it (on Linux it must be enabled in the kernel by the sysadmin)
384 try to use RFC 7413 "TCP Fast Open". No data is sent on the SYN segment
385 but it permits a peer that also supports the facility to send its SMTP
386 banner immediately after the SYN,ACK segment rather then waiting for
387 another ACK - so saving up to one roundtrip time. Because it requires
388 previous communication with the peer (we save a cookie from it) this
389 will only become active on frequently-contacted destinations.
391 16. A new syslog_pid option to suppress PID duplication in syslog lines.
397 1. The ACL conditions regex and mime_regex now capture substrings
398 into numeric variables $regex1 to 9, like the "match" expansion condition.
400 2. New $callout_address variable records the address used for a spam=,
401 malware= or verify= callout.
403 3. Transports now take a "max_parallel" option, to limit concurrency.
405 4. Expansion operators ${ipv6norm:<string>} and ${ipv6denorm:<string>}.
406 The latter expands to a 8-element colon-sep set of hex digits including
407 leading zeroes. A trailing ipv4-style dotted-decimal set is converted
408 to hex. Pure ipv4 addresses are converted to IPv4-mapped IPv6.
409 The former operator strips leading zeroes and collapses the longest
410 set of 0-groups to a double-colon.
412 5. New "-bP config" support, to dump the effective configuration.
414 6. New $dkim_key_length variable.
416 7. New base64d and base64 expansion items (the existing str2b64 being a
417 synonym of the latter). Add support in base64 for certificates.
419 8. New main configuration option "bounce_return_linesize_limit" to
420 avoid oversize bodies in bounces. The default value matches RFC
423 9. New $initial_cwd expansion variable.
429 1. Support for using the system standard CA bundle.
431 2. New expansion items $config_file, $config_dir, containing the file
432 and directory name of the main configuration file. Also $exim_version.
434 3. New "malware=" support for Avast.
436 4. New "spam=" variant option for Rspamd.
438 5. Assorted options on malware= and spam= scanners.
440 6. A command-line option to write a comment into the logfile.
442 7. If built with EXPERIMENTAL_SOCKS feature enabled, the smtp transport can
443 be configured to make connections via socks5 proxies.
445 8. If built with EXPERIMENTAL_INTERNATIONAL, support is included for
446 the transmission of UTF-8 envelope addresses.
448 9. If built with EXPERIMENTAL_INTERNATIONAL, an expansion item for a commonly
449 used encoding of Maildir folder names.
451 10. A logging option for slow DNS lookups.
453 11. New ${env {<variable>}} expansion.
455 12. A non-SMTP authenticator using information from TLS client certificates.
457 13. Main option "tls_eccurve" for selecting an Elliptic Curve for TLS.
458 Patch originally by Wolfgang Breyha.
460 14. Main option "dns_trust_aa" for trusting your local nameserver at the
461 same level as DNSSEC.
466 1. If built with EXPERIMENTAL_DANE feature enabled, Exim will follow the
467 DANE SMTP draft to assess a secure chain of trust of the certificate
468 used to establish the TLS connection based on a TLSA record in the
469 domain of the sender.
471 2. The EXPERIMENTAL_TPDA feature has been renamed to EXPERIMENTAL_EVENT
472 and several new events have been created. The reason is because it has
473 been expanded beyond just firing events during the transport phase. Any
474 existing TPDA transport options will have to be rewritten to use a new
475 $event_name expansion variable in a condition. Refer to the
476 experimental-spec.txt for details and examples.
478 3. The EXPERIMENTAL_CERTNAMES features is an enhancement to verify that
479 server certs used for TLS match the result of the MX lookup. It does
480 not use the same mechanism as DANE.
490 1. If built with the EXPERIMENTAL_PROXY feature enabled, Exim can be
491 configured to expect an initial header from a proxy that will make the
492 actual external source IP:host be used in exim instead of the IP of the
493 proxy that is connecting to it.
495 2. New verify option header_names_ascii, which will check to make sure
496 there are no non-ASCII characters in header names. Exim itself handles
497 those non-ASCII characters, but downstream apps may not, so Exim can
498 detect and reject if those characters are present.
500 3. New expansion operator ${utf8clean:string} to replace malformed UTF8
501 codepoints with valid ones.
503 4. New malware type "sock". Talks over a Unix or TCP socket, sending one
504 command line and matching a regex against the return data for trigger
505 and a second regex to extract malware_name. The mail spoolfile name can
506 be included in the command line.
508 5. The smtp transport now supports options "tls_verify_hosts" and
509 "tls_try_verify_hosts". If either is set the certificate verification
510 is split from the encryption operation. The default remains that a failed
511 verification cancels the encryption.
513 6. New SERVERS override of default ldap server list. In the ACLs, an ldap
514 lookup can now set a list of servers to use that is different from the
517 7. New command-line option -C for exiqgrep to specify alternate exim.conf
518 file when searching the queue.
520 8. OCSP now supports GnuTLS also, if you have version 3.1.3 or later of that.
522 9. Support for DNSSEC on outbound connections.
524 10. New variables "tls_(in,out)_(our,peer)cert" and expansion item
525 "certextract" to extract fields from them. Hash operators md5 and sha1
526 work over them for generating fingerprints, and a new sha256 operator
529 11. PRDR is now supported dy default.
531 12. OCSP stapling is now supported by default.
533 13. If built with the EXPERIMENTAL_DSN feature enabled, Exim will output
534 Delivery Status Notification messages in MIME format, and negotiate
535 DSN features per RFC 3461.
541 1. New command-line option -bI:sieve will list all supported sieve extensions
542 of this Exim build on standard output, one per line.
543 ManageSieve (RFC 5804) providers managing scripts for use by Exim should
544 query this to establish the correct list to include in the protocol's
545 SIEVE capability line.
547 2. If the -n option is combined with the -bP option, then the name of an
548 emitted option is not output, only the value (if visible to you).
549 For instance, "exim -n -bP pid_file_path" should just emit a pathname
550 followed by a newline, and no other text.
552 3. When built with SUPPORT_TLS and USE_GNUTLS, the SMTP transport driver now
553 has a "tls_dh_min_bits" option, to set the minimum acceptable number of
554 bits in the Diffie-Hellman prime offered by a server (in DH ciphersuites)
555 acceptable for security. (Option accepted but ignored if using OpenSSL).
556 Defaults to 1024, the old value. May be lowered only to 512, or raised as
557 far as you like. Raising this may hinder TLS interoperability with other
558 sites and is not currently recommended. Lowering this will permit you to
559 establish a TLS session which is not as secure as you might like.
561 Unless you really know what you are doing, leave it alone.
563 4. If not built with DISABLE_DNSSEC, Exim now has the main option
564 dns_dnssec_ok; if set to 1 then Exim will initialise the resolver library
565 to send the DO flag to your recursive resolver. If you have a recursive
566 resolver, which can set the Authenticated Data (AD) flag in results, Exim
567 can now detect this. Exim does not perform validation itself, instead
568 relying upon a trusted path to the resolver.
570 Current status: work-in-progress; $sender_host_dnssec variable added.
572 5. DSCP support for outbound connections: on a transport using the smtp driver,
573 set "dscp = ef", for instance, to cause the connections to have the relevant
574 DSCP (IPv4 TOS or IPv6 TCLASS) value in the header.
576 Similarly for inbound connections, there is a new control modifier, dscp,
577 so "warn control = dscp/ef" in the connect ACL, or after authentication.
579 Supported values depend upon system libraries. "exim -bI:dscp" to list the
580 ones Exim knows of. You can also set a raw number 0..0x3F.
582 6. The -G command-line flag is no longer ignored; it is now equivalent to an
583 ACL setting "control = suppress_local_fixups". The -L command-line flag
584 is now accepted and forces use of syslog, with the provided tag as the
585 process name. A few other flags used by Sendmail are now accepted and
588 7. New cutthrough routing feature. Requested by a "control = cutthrough_delivery"
589 ACL modifier; works for single-recipient mails which are received on and
590 deliverable via SMTP. Using the connection made for a recipient verify,
591 if requested before the verify, or a new one made for the purpose while
592 the inbound connection is still active. The bulk of the mail item is copied
593 direct from the inbound socket to the outbound (as well as the spool file).
594 When the source notifies the end of data, the data acceptance by the destination
595 is negotiated before the acceptance is sent to the source. If the destination
596 does not accept the mail item, for example due to content-scanning, the item
597 is not accepted from the source and therefore there is no need to generate
598 a bounce mail. This is of benefit when providing a secondary-MX service.
599 The downside is that delays are under the control of the ultimate destination
602 The Received-by: header on items delivered by cutthrough is generated
603 early in reception rather than at the end; this will affect any timestamp
604 included. The log line showing delivery is recorded before that showing
605 reception; it uses a new ">>" tag instead of "=>".
607 To support the feature, verify-callout connections can now use ESMTP and TLS.
608 The usual smtp transport options are honoured, plus a (new, default everything)
609 hosts_verify_avoid_tls.
611 New variable families named tls_in_cipher, tls_out_cipher etc. are introduced
612 for specific access to the information for each connection. The old names
613 are present for now but deprecated.
615 Not yet supported: IGNOREQUOTA, SIZE, PIPELINING.
617 8. New expansion operators ${listnamed:name} to get the content of a named list
618 and ${listcount:string} to count the items in a list.
620 9. New global option "gnutls_allow_auto_pkcs11", defaults false. The GnuTLS
621 rewrite in 4.80 combines with GnuTLS 2.12.0 or later, to autoload PKCS11
622 modules. For some situations this is desirable, but we expect admin in
623 those situations to know they want the feature. More commonly, it means
624 that GUI user modules get loaded and are broken by the setuid Exim being
625 unable to access files specified in environment variables and passed
626 through, thus breakage. So we explicitly inhibit the PKCS11 initialisation
627 unless this new option is set.
629 Some older OS's with earlier versions of GnuTLS might not have pkcs11 ability,
630 so have also added a build option which can be used to build Exim with GnuTLS
631 but without trying to use any kind of PKCS11 support. Uncomment this in the
634 AVOID_GNUTLS_PKCS11=yes
636 10. The "acl = name" condition on an ACL now supports optional arguments.
637 New expansion item "${acl {name}{arg}...}" and expansion condition
638 "acl {{name}{arg}...}" are added. In all cases up to nine arguments
639 can be used, appearing in $acl_arg1 to $acl_arg9 for the called ACL.
640 Variable $acl_narg contains the number of arguments. If the ACL sets
641 a "message =" value this becomes the result of the expansion item,
642 or the value of $value for the expansion condition. If the ACL returns
643 accept the expansion condition is true; if reject, false. A defer
644 return results in a forced fail.
646 11. Routers and transports can now have multiple headers_add and headers_remove
647 option lines. The concatenated list is used.
649 12. New ACL modifier "remove_header" can remove headers before message gets
650 handled by routers/transports.
652 13. New dnsdb lookup pseudo-type "a+". A sequence of "a6" (if configured),
653 "aaaa" and "a" lookups is done and the full set of results returned.
655 14. New expansion variable $headers_added with content from ACL add_header
656 modifier (but not yet added to message).
658 15. New 8bitmime status logging option for received messages. Log field "M8S".
660 16. New authenticated_sender logging option, adding to log field "A".
662 17. New expansion variables $router_name and $transport_name. Useful
663 particularly for debug_print as -bt command-line option does not
664 require privilege whereas -d does.
666 18. If built with EXPERIMENTAL_PRDR, per-recipient data responses per a
667 proposed extension to SMTP from Eric Hall.
669 19. The pipe transport has gained the force_command option, to allow
670 decorating commands from user .forward pipe aliases with prefix
671 wrappers, for instance.
673 20. Callout connections can now AUTH; the same controls as normal delivery
676 21. Support for DMARC, using opendmarc libs, can be enabled. It adds new
677 options: dmarc_forensic_sender, dmarc_history_file, and dmarc_tld_file.
678 It adds new expansion variables $dmarc_ar_header, $dmarc_status,
679 $dmarc_status_text, and $dmarc_used_domain. It adds a new acl modifier
680 dmarc_status. It adds new control flags dmarc_disable_verify and
681 dmarc_enable_forensic. The default for the dmarc_tld_file option is
682 "/etc/exim/opendmarc.tlds" and can be changed via EDITME.
684 22. Add expansion variable $authenticated_fail_id, which is the username
685 provided to the authentication method which failed. It is available
686 for use in subsequent ACL processing (typically quit or notquit ACLs).
688 23. New ACL modifier "udpsend" can construct a UDP packet to send to a given
691 24. New ${hexquote:..string..} expansion operator converts non-printable
692 characters in the string to \xNN form.
694 25. Experimental TPDA (Transport Post Delivery Action) function added.
695 Patch provided by Axel Rau.
697 26. Experimental Redis lookup added. Patch provided by Warren Baker.
703 1. New authenticator driver, "gsasl". Server-only (at present).
704 This is a SASL interface, licensed under GPL, which can be found at
705 http://www.gnu.org/software/gsasl/.
706 This system does not provide sources of data for authentication, so
707 careful use needs to be made of the conditions in Exim.
709 2. New authenticator driver, "heimdal_gssapi". Server-only.
710 A replacement for using cyrus_sasl with Heimdal, now that $KRB5_KTNAME
711 is no longer honoured for setuid programs by Heimdal. Use the
712 "server_keytab" option to point to the keytab.
714 3. The "pkg-config" system can now be used when building Exim to reference
715 cflags and library information for lookups and authenticators, rather
716 than having to update "CFLAGS", "AUTH_LIBS", "LOOKUP_INCLUDE" and
717 "LOOKUP_LIBS" directly. Similarly for handling the TLS library support
718 without adjusting "TLS_INCLUDE" and "TLS_LIBS".
720 In addition, setting PCRE_CONFIG=yes will query the pcre-config tool to
721 find the headers and libraries for PCRE.
723 4. New expansion variable $tls_bits.
725 5. New lookup type, "dbmjz". Key is an Exim list, the elements of which will
726 be joined together with ASCII NUL characters to construct the key to pass
727 into the DBM library. Can be used with gsasl to access sasldb2 files as
730 6. OpenSSL now supports TLS1.1 and TLS1.2 with OpenSSL 1.0.1.
732 Avoid release 1.0.1a if you can. Note that the default value of
733 "openssl_options" is no longer "+dont_insert_empty_fragments", as that
734 increased susceptibility to attack. This may still have interoperability
735 implications for very old clients (see version 4.31 change 37) but
736 administrators can choose to make the trade-off themselves and restore
737 compatibility at the cost of session security.
739 7. Use of the new expansion variable $tls_sni in the main configuration option
740 tls_certificate will cause Exim to re-expand the option, if the client
741 sends the TLS Server Name Indication extension, to permit choosing a
742 different certificate; tls_privatekey will also be re-expanded. You must
743 still set these options to expand to valid files when $tls_sni is not set.
745 The SMTP Transport has gained the option tls_sni, which will set a hostname
746 for outbound TLS sessions, and set $tls_sni too.
748 A new log_selector, +tls_sni, has been added, to log received SNI values
749 for Exim as a server.
751 8. The existing "accept_8bitmime" option now defaults to true. This means
752 that Exim is deliberately not strictly RFC compliant. We're following
753 Dan Bernstein's advice in http://cr.yp.to/smtp/8bitmime.html by default.
754 Those who disagree, or know that they are talking to mail servers that,
755 even today, are not 8-bit clean, need to turn off this option.
757 9. Exim can now be started with -bw (with an optional timeout, given as
758 -bw<timespec>). With this, stdin at startup is a socket that is
759 already listening for connections. This has a more modern name of
760 "socket activation", but forcing the activated socket to fd 0. We're
761 interested in adding more support for modern variants.
763 10. ${eval } now uses 64-bit values on supporting platforms. A new "G" suffix
764 for numbers indicates multiplication by 1024^3.
766 11. The GnuTLS support has been revamped; the three options gnutls_require_kx,
767 gnutls_require_mac & gnutls_require_protocols are no longer supported.
768 tls_require_ciphers is now parsed by gnutls_priority_init(3) as a priority
769 string, documentation for which is at:
770 http://www.gnutls.org/manual/html_node/Priority-Strings.html
772 SNI support has been added to Exim's GnuTLS integration too.
774 For sufficiently recent GnuTLS libraries, ${randint:..} will now use
775 gnutls_rnd(), asking for GNUTLS_RND_NONCE level randomness.
777 12. With OpenSSL, if built with EXPERIMENTAL_OCSP, a new option tls_ocsp_file
778 is now available. If the contents of the file are valid, then Exim will
779 send that back in response to a TLS status request; this is OCSP Stapling.
780 Exim will not maintain the contents of the file in any way: administrators
781 are responsible for ensuring that it is up-to-date.
783 See "experimental-spec.txt" for more details.
785 13. ${lookup dnsdb{ }} supports now SPF record types. They are handled
786 identically to TXT record lookups.
788 14. New expansion variable $tod_epoch_l for higher-precision time.
790 15. New global option tls_dh_max_bits, defaulting to current value of NSS
791 hard-coded limit of DH ephemeral bits, to fix interop problems caused by
792 GnuTLS 2.12 library recommending a bit count higher than NSS supports.
794 16. tls_dhparam now used by both OpenSSL and GnuTLS, can be path or identifier.
795 Option can now be a path or an identifier for a standard prime.
796 If unset, we use the DH prime from section 2.2 of RFC 5114, "ike23".
797 Set to "historic" to get the old GnuTLS behaviour of auto-generated DH
800 17. SSLv2 now disabled by default in OpenSSL. (Never supported by GnuTLS).
801 Use "openssl_options -no_sslv2" to re-enable support, if your OpenSSL
802 install was not built with OPENSSL_NO_SSL2 ("no-ssl2").
808 1. New options for the ratelimit ACL condition: /count= and /unique=.
809 The /noupdate option has been replaced by a /readonly option.
811 2. The SMTP transport's protocol option may now be set to "smtps", to
812 use SSL-on-connect outbound.
814 3. New variable $av_failed, set true if the AV scanner deferred; ie, when
815 there is a problem talking to the AV scanner, or the AV scanner running.
817 4. New expansion conditions, "inlist" and "inlisti", which take simple lists
818 and check if the search item is a member of the list. This does not
819 support named lists, but does subject the list part to string expansion.
821 5. Unless the new EXPAND_LISTMATCH_RHS build option is set when Exim was
822 built, Exim no longer performs string expansion on the second string of
823 the match_* expansion conditions: "match_address", "match_domain",
824 "match_ip" & "match_local_part". Named lists can still be used.
830 1. The global option "dns_use_edns0" may be set to coerce EDNS0 usage on
831 or off in the resolver library.
837 1. In addition to the existing LDAP and LDAP/SSL ("ldaps") support, there
838 is now LDAP/TLS support, given sufficiently modern OpenLDAP client
839 libraries. The following global options have been added in support of
840 this: ldap_ca_cert_dir, ldap_ca_cert_file, ldap_cert_file, ldap_cert_key,
841 ldap_cipher_suite, ldap_require_cert, ldap_start_tls.
843 2. The pipe transport now takes a boolean option, "freeze_signal", default
844 false. When true, if the external delivery command exits on a signal then
845 Exim will freeze the message in the queue, instead of generating a bounce.
847 3. Log filenames may now use %M as an escape, instead of %D (still available).
848 The %M pattern expands to yyyymm, providing month-level resolution.
850 4. The $message_linecount variable is now updated for the maildir_tag option,
851 in the same way as $message_size, to reflect the real number of lines,
852 including any header additions or removals from transport.
854 5. When contacting a pool of SpamAssassin servers configured in spamd_address,
855 Exim now selects entries randomly, to better scale in a cluster setup.
861 1. SECURITY FIX: privilege escalation flaw fixed. On Linux (and only Linux)
862 the flaw permitted the Exim run-time user to cause root to append to
863 arbitrary files of the attacker's choosing, with the content based
864 on content supplied by the attacker.
866 2. Exim now supports loading some lookup types at run-time, using your
867 platform's dlopen() functionality. This has limited platform support
868 and the intention is not to support every variant, it's limited to
869 dlopen(). This permits the main Exim binary to not be linked against
870 all the libraries needed for all the lookup types.
876 NOTE: this version is not guaranteed backwards-compatible, please read the
877 items below carefully
879 1. A new main configuration option, "openssl_options", is available if Exim
880 is built with SSL support provided by OpenSSL. The option allows
881 administrators to specify OpenSSL options to be used on connections;
882 typically this is to set bug compatibility features which the OpenSSL
883 developers have not enabled by default. There may be security
884 consequences for certain options, so these should not be changed
887 2. A new pipe transport option, "permit_coredumps", may help with problem
888 diagnosis in some scenarios. Note that Exim is typically installed as
889 a setuid binary, which on most OSes will inhibit coredumps by default,
890 so that safety mechanism would have to be overridden for this option to
891 be able to take effect.
893 3. ClamAV 0.95 is now required for ClamAV support in Exim, unless
894 Local/Makefile sets: WITH_OLD_CLAMAV_STREAM=yes
895 Note that this switches Exim to use a new API ("INSTREAM") and a future
896 release of ClamAV will remove support for the old API ("STREAM").
898 The av_scanner option, when set to "clamd", now takes an optional third
899 part, "local", which causes Exim to pass a filename to ClamAV instead of
900 the file content. This is the same behaviour as when clamd is pointed at
901 a Unix-domain socket. For example:
903 av_scanner = clamd:192.0.2.3 1234:local
905 ClamAV's ExtendedDetectionInfo response format is now handled.
907 4. There is now a -bmalware option, restricted to admin users. This option
908 takes one parameter, a filename, and scans that file with Exim's
909 malware-scanning framework. This is intended purely as a debugging aid
910 to ensure that Exim's scanning is working, not to replace other tools.
911 Note that the ACL framework is not invoked, so if av_scanner references
912 ACL variables without a fallback then this will fail.
914 5. There is a new expansion operator, "reverse_ip", which will reverse IP
915 addresses; IPv4 into dotted quad, IPv6 into dotted nibble. Examples:
917 ${reverse_ip:192.0.2.4}
919 ${reverse_ip:2001:0db8:c42:9:1:abcd:192.0.2.3}
920 -> 3.0.2.0.0.0.0.c.d.c.b.a.1.0.0.0.9.0.0.0.2.4.c.0.8.b.d.0.1.0.0.2
922 6. There is a new ACL control called "debug", to enable debug logging.
923 This allows selective logging of certain incoming transactions within
924 production environments, with some care. It takes two options, "tag"
925 and "opts"; "tag" is included in the filename of the log and "opts"
926 is used as per the -d<options> command-line option. Examples, which
927 don't all make sense in all contexts:
930 control = debug/tag=.$sender_host_address
931 control = debug/opts=+expand+acl
932 control = debug/tag=.$message_exim_id/opts=+expand
934 7. It has always been implicit in the design and the documentation that
935 "the Exim user" is not root. src/EDITME said that using root was
936 "very strongly discouraged". This is not enough to keep people from
937 shooting themselves in the foot in days when many don't configure Exim
938 themselves but via package build managers. The security consequences of
939 running various bits of network code are severe if there should be bugs in
940 them. As such, the Exim user may no longer be root. If configured
941 statically, Exim will refuse to build. If configured as ref:user then Exim
942 will exit shortly after start-up. If you must shoot yourself in the foot,
943 then henceforth you will have to maintain your own local patches to strip
946 8. There is a new expansion condition, bool_lax{}. Where bool{} uses the ACL
947 condition logic to determine truth/failure and will fail to expand many
948 strings, bool_lax{} uses the router condition logic, where most strings
950 Note: bool{00} is false, bool_lax{00} is true.
952 9. Routers now support multiple "condition" tests.
954 10. There is now a runtime configuration option "tcp_wrappers_daemon_name".
955 Setting this allows an admin to define which entry in the tcpwrappers
956 config file will be used to control access to the daemon. This option
957 is only available when Exim is built with USE_TCP_WRAPPERS. The
958 default value is set at build time using the TCP_WRAPPERS_DAEMON_NAME
961 11. [POSSIBLE CONFIG BREAKAGE] The default value for system_filter_user is now
962 the Exim run-time user, instead of root.
964 12. [POSSIBLE CONFIG BREAKAGE] ALT_CONFIG_ROOT_ONLY is no longer optional and
965 is forced on. This is mitigated by the new build option
966 TRUSTED_CONFIG_LIST which defines a list of configuration files which
967 are trusted; one per line. If a config file is owned by root and matches
968 a pathname in the list, then it may be invoked by the Exim build-time
969 user without Exim relinquishing root privileges.
971 13. [POSSIBLE CONFIG BREAKAGE] The Exim user is no longer automatically
972 trusted to supply -D<Macro[=Value]> overrides on the command-line. Going
973 forward, we recommend using TRUSTED_CONFIG_LIST with shim configs that
974 include the main config. As a transition mechanism, we are temporarily
975 providing a work-around: the new build option WHITELIST_D_MACROS provides
976 a colon-separated list of macro names which may be overridden by the Exim
977 run-time user. The values of these macros are constrained to the regex
978 ^[A-Za-z0-9_/.-]*$ (which explicitly does allow for empty values).
984 1. TWO SECURITY FIXES: one relating to mail-spools which are globally
985 writable, the other to locking of MBX folders (not mbox).
987 2. MySQL stored procedures are now supported.
989 3. The dkim_domain transport option is now a list, not a single string, and
990 messages will be signed for each element in the list (discarding
993 4. The 4.70 release unexpectedly changed the behaviour of dnsdb TXT lookups
994 in the presence of multiple character strings within the RR. Prior to 4.70,
995 only the first string would be returned. The dnsdb lookup now, by default,
996 preserves the pre-4.70 semantics, but also now takes an extended output
997 separator specification. The separator can be followed by a semicolon, to
998 concatenate the individual text strings together with no join character,
999 or by a comma and a second separator character, in which case the text
1000 strings within a TXT record are joined on that second character.
1001 Administrators are reminded that DNS provides no ordering guarantees
1002 between multiple records in an RRset. For example:
1004 foo.example. IN TXT "a" "b" "c"
1005 foo.example. IN TXT "d" "e" "f"
1007 ${lookup dnsdb{>/ txt=foo.example}} -> "a/d"
1008 ${lookup dnsdb{>/; txt=foo.example}} -> "def/abc"
1009 ${lookup dnsdb{>/,+ txt=foo.example}} -> "a+b+c/d+e+f"
1015 1. Native DKIM support without an external library.
1016 (Note that if no action to prevent it is taken, a straight upgrade will
1017 result in DKIM verification of all signed incoming emails. See spec
1018 for details on conditionally disabling)
1020 2. Experimental DCC support via dccifd (contributed by Wolfgang Breyha).
1022 3. There is now a bool{} expansion condition which maps certain strings to
1023 true/false condition values (most likely of use in conjunction with the
1024 and{} expansion operator).
1026 4. The $spam_score, $spam_bar and $spam_report variables are now available
1029 5. exim -bP now supports "macros", "macro_list" or "macro MACRO_NAME" as
1030 options, provided that Exim is invoked by an admin_user.
1032 6. There is a new option gnutls_compat_mode, when linked against GnuTLS,
1033 which increases compatibility with older clients at the cost of decreased
1034 security. Don't set this unless you need to support such clients.
1036 7. There is a new expansion operator, ${randint:...} which will produce a
1037 "random" number less than the supplied integer. This randomness is
1038 not guaranteed to be cryptographically strong, but depending upon how
1039 Exim was built may be better than the most naive schemes.
1041 8. Exim now explicitly ensures that SHA256 is available when linked against
1044 9. The transport_filter_timeout option now applies to SMTP transports too.
1050 1. Preliminary DKIM support in Experimental.
1056 1. The body_linecount and body_zerocount C variables are now exported in the
1059 2. When a dnslists lookup succeeds, the key that was looked up is now placed
1060 in $dnslist_matched. When the key is an IP address, it is not reversed in
1061 this variable (though it is, of course, in the actual lookup). In simple
1064 deny dnslists = spamhaus.example
1066 the key is also available in another variable (in this case,
1067 $sender_host_address). In more complicated cases, however, this is not
1068 true. For example, using a data lookup might generate a dnslists lookup
1071 deny dnslists = spamhaus.example/<|192.168.1.2|192.168.6.7|...
1073 If this condition succeeds, the value in $dnslist_matched might be
1074 192.168.6.7 (for example).
1076 3. Authenticators now have a client_condition option. When Exim is running as
1077 a client, it skips an authenticator whose client_condition expansion yields
1078 "0", "no", or "false". This can be used, for example, to skip plain text
1079 authenticators when the connection is not encrypted by a setting such as:
1081 client_condition = ${if !eq{$tls_cipher}{}}
1083 Note that the 4.67 documentation states that $tls_cipher contains the
1084 cipher used for incoming messages. In fact, during SMTP delivery, it
1085 contains the cipher used for the delivery. The same is true for
1088 4. There is now a -Mvc <message-id> option, which outputs a copy of the
1089 message to the standard output, in RFC 2822 format. The option can be used
1090 only by an admin user.
1092 5. There is now a /noupdate option for the ratelimit ACL condition. It
1093 computes the rate and checks the limit as normal, but it does not update
1094 the saved data. This means that, in relevant ACLs, it is possible to lookup
1095 the existence of a specified (or auto-generated) ratelimit key without
1096 incrementing the ratelimit counter for that key.
1098 In order for this to be useful, another ACL entry must set the rate
1099 for the same key somewhere (otherwise it will always be zero).
1104 # Read the rate; if it doesn't exist or is below the maximum
1105 # we update it below
1106 deny ratelimit = 100 / 5m / strict / noupdate
1107 log_message = RATE: $sender_rate / $sender_rate_period \
1108 (max $sender_rate_limit)
1110 [... some other logic and tests...]
1112 warn ratelimit = 100 / 5m / strict / per_cmd
1113 log_message = RATE UPDATE: $sender_rate / $sender_rate_period \
1114 (max $sender_rate_limit)
1115 condition = ${if le{$sender_rate}{$sender_rate_limit}}
1119 6. The variable $max_received_linelength contains the number of bytes in the
1120 longest line that was received as part of the message, not counting the
1121 line termination character(s).
1123 7. Host lists can now include +ignore_defer and +include_defer, analogous to
1124 +ignore_unknown and +include_unknown. These options should be used with
1125 care, probably only in non-critical host lists such as whitelists.
1127 8. There's a new option called queue_only_load_latch, which defaults true.
1128 If set false when queue_only_load is greater than zero, Exim re-evaluates
1129 the load for each incoming message in an SMTP session. Otherwise, once one
1130 message is queued, the remainder are also.
1132 9. There is a new ACL, specified by acl_smtp_notquit, which is run in most
1133 cases when an SMTP session ends without sending QUIT. However, when Exim
1134 itself is is bad trouble, such as being unable to write to its log files,
1135 this ACL is not run, because it might try to do things (such as write to
1136 log files) that make the situation even worse.
1138 Like the QUIT ACL, this new ACL is provided to make it possible to gather
1139 statistics. Whatever it returns (accept or deny) is immaterial. The "delay"
1140 modifier is forbidden in this ACL.
1142 When the NOTQUIT ACL is running, the variable $smtp_notquit_reason is set
1143 to a string that indicates the reason for the termination of the SMTP
1144 connection. The possible values are:
1146 acl-drop Another ACL issued a "drop" command
1147 bad-commands Too many unknown or non-mail commands
1148 command-timeout Timeout while reading SMTP commands
1149 connection-lost The SMTP connection has been lost
1150 data-timeout Timeout while reading message data
1151 local-scan-error The local_scan() function crashed
1152 local-scan-timeout The local_scan() function timed out
1153 signal-exit SIGTERM or SIGINT
1154 synchronization-error SMTP synchronization error
1155 tls-failed TLS failed to start
1157 In most cases when an SMTP connection is closed without having received
1158 QUIT, Exim sends an SMTP response message before actually closing the
1159 connection. With the exception of acl-drop, the default message can be
1160 overridden by the "message" modifier in the NOTQUIT ACL. In the case of a
1161 "drop" verb in another ACL, it is the message from the other ACL that is
1164 10. For MySQL and PostgreSQL lookups, it is now possible to specify a list of
1165 servers with individual queries. This is done by starting the query with
1166 "servers=x:y:z;", where each item in the list may take one of two forms:
1168 (1) If it is just a host name, the appropriate global option (mysql_servers
1169 or pgsql_servers) is searched for a host of the same name, and the
1170 remaining parameters (database, user, password) are taken from there.
1172 (2) If it contains any slashes, it is taken as a complete parameter set.
1174 The list of servers is used in exactly the same was as the global list.
1175 Once a connection to a server has happened and a query has been
1176 successfully executed, processing of the lookup ceases.
1178 This feature is intended for use in master/slave situations where updates
1179 are occurring, and one wants to update a master rather than a slave. If the
1180 masters are in the list for reading, you might have:
1182 mysql_servers = slave1/db/name/pw:slave2/db/name/pw:master/db/name/pw
1184 In an updating lookup, you could then write
1186 ${lookup mysql{servers=master; UPDATE ...}
1188 If, on the other hand, the master is not to be used for reading lookups:
1190 pgsql_servers = slave1/db/name/pw:slave2/db/name/pw
1192 you can still update the master by
1194 ${lookup pgsql{servers=master/db/name/pw; UPDATE ...}
1196 11. The message_body_newlines option (default FALSE, for backwards
1197 compatibility) can be used to control whether newlines are present in
1198 $message_body and $message_body_end. If it is FALSE, they are replaced by
1205 1. There is a new log selector called smtp_no_mail, which is not included in
1206 the default setting. When it is set, a line is written to the main log
1207 whenever an accepted SMTP connection terminates without having issued a
1210 2. When an item in a dnslists list is followed by = and & and a list of IP
1211 addresses, the behaviour was not clear when the lookup returned more than
1212 one IP address. This has been solved by the addition of == and =& for "all"
1213 rather than the default "any" matching.
1215 3. Up till now, the only control over which cipher suites GnuTLS uses has been
1216 for the cipher algorithms. New options have been added to allow some of the
1217 other parameters to be varied.
1219 4. There is a new compile-time option called ENABLE_DISABLE_FSYNC. When it is
1220 set, Exim compiles a runtime option called disable_fsync.
1222 5. There is a new variable called $smtp_count_at_connection_start.
1224 6. There's a new control called no_pipelining.
1226 7. There are two new variables called $sending_ip_address and $sending_port.
1227 These are set whenever an SMTP connection to another host has been set up.
1229 8. The expansion of the helo_data option in the smtp transport now happens
1230 after the connection to the server has been made.
1232 9. There is a new expansion operator ${rfc2047d: that decodes strings that
1233 are encoded as per RFC 2047.
1235 10. There is a new log selector called "pid", which causes the current process
1236 id to be added to every log line, in square brackets, immediately after the
1239 11. Exim has been modified so that it flushes SMTP output before implementing
1240 a delay in an ACL. It also flushes the output before performing a callout,
1241 as this can take a substantial time. These behaviours can be disabled by
1242 obeying control = no_delay_flush or control = no_callout_flush,
1243 respectively, at some earlier stage of the connection.
1245 12. There are two new expansion conditions that iterate over a list. They are
1246 called forany and forall.
1248 13. There's a new global option called dsn_from that can be used to vary the
1249 contents of From: lines in bounces and other automatically generated
1250 messages ("delivery status notifications" - hence the name of the option).
1252 14. The smtp transport has a new option called hosts_avoid_pipelining.
1254 15. By default, exigrep does case-insensitive matches. There is now a -I option
1255 that makes it case-sensitive.
1257 16. A number of new features ("addresses", "map", "filter", and "reduce") have
1258 been added to string expansions to make it easier to process lists of
1259 items, typically addresses.
1261 17. There's a new ACL modifier called "continue". It does nothing of itself,
1262 and processing of the ACL always continues with the next condition or
1263 modifier. It is provided so that the side effects of expanding its argument
1266 18. It is now possible to use newline and other control characters (those with
1267 values less than 32, plus DEL) as separators in lists.
1269 19. The exigrep utility now has a -v option, which inverts the matching
1272 20. The host_find_failed option in the manualroute router can now be set to
1279 No new features were added to 4.66.
1285 No new features were added to 4.65.
1291 1. ACL variables can now be given arbitrary names, as long as they start with
1292 "acl_c" or "acl_m" (for connection variables and message variables), are at
1293 least six characters long, with the sixth character being either a digit or
1296 2. There is a new ACL modifier called log_reject_target. It makes it possible
1297 to specify which logs are used for messages about ACL rejections.
1299 3. There is a new authenticator called "dovecot". This is an interface to the
1300 authentication facility of the Dovecot POP/IMAP server, which can support a
1301 number of authentication methods.
1303 4. The variable $message_headers_raw provides a concatenation of all the
1304 messages's headers without any decoding. This is in contrast to
1305 $message_headers, which does RFC2047 decoding on the header contents.
1307 5. In a DNS black list, if two domain names, comma-separated, are given, the
1308 second is used first to do an initial check, making use of any IP value
1309 restrictions that are set. If there is a match, the first domain is used,
1310 without any IP value restrictions, to get the TXT record.
1312 6. All authenticators now have a server_condition option.
1314 7. There is a new command-line option called -Mset. It is useful only in
1315 conjunction with -be (that is, when testing string expansions). It must be
1316 followed by a message id; Exim loads the given message from its spool
1317 before doing the expansions.
1319 8. Another similar new command-line option is called -bem. It operates like
1320 -be except that it must be followed by the name of a file that contains a
1323 9. When an address is delayed because of a 4xx response to a RCPT command, it
1324 is now the combination of sender and recipient that is delayed in
1325 subsequent queue runs until its retry time is reached.
1327 10. Unary negation and the bitwise logical operators and, or, xor, not, and
1328 shift, have been added to the eval: and eval10: expansion items.
1330 11. The variables $interface_address and $interface_port have been renamed
1331 as $received_ip_address and $received_port, to make it clear that they
1332 relate to message reception rather than delivery. (The old names remain
1333 available for compatibility.)
1335 12. The "message" modifier can now be used on "accept" and "discard" acl verbs
1336 to vary the message that is sent when an SMTP command is accepted.
1342 1. There is a new Boolean option called filter_prepend_home for the redirect
1345 2. There is a new acl, set by acl_not_smtp_start, which is run right at the
1346 start of receiving a non-SMTP message, before any of the message has been
1349 3. When an SMTP error message is specified in a "message" modifier in an ACL,
1350 or in a :fail: or :defer: message in a redirect router, Exim now checks the
1351 start of the message for an SMTP error code.
1353 4. There is a new parameter for LDAP lookups called "referrals", which takes
1354 one of the settings "follow" (the default) or "nofollow".
1356 5. Version 20070721.2 of exipick now included, offering these new options:
1358 After all other sorting options have bee processed, reverse order
1359 before displaying messages (-R is synonym).
1361 Randomize order of matching messages before displaying.
1363 Instead of displaying the matching messages, display the sum
1365 --sort <variable>[,<variable>...]
1366 Before displaying matching messages, sort the messages according to
1367 each messages value for each variable.
1369 Negate the value for every test (returns inverse output from the
1370 same criteria without --not).
1376 1. The ${readsocket expansion item now supports Internet domain sockets as well
1377 as Unix domain sockets. If the first argument begins "inet:", it must be of
1378 the form "inet:host:port". The port is mandatory; it may be a number or the
1379 name of a TCP port in /etc/services. The host may be a name, or it may be an
1380 IP address. An ip address may optionally be enclosed in square brackets.
1381 This is best for IPv6 addresses. For example:
1383 ${readsocket{inet:[::1]:1234}{<request data>}...
1385 Only a single host name may be given, but if looking it up yield more than
1386 one IP address, they are each tried in turn until a connection is made. Once
1387 a connection has been made, the behaviour is as for ${readsocket with a Unix
1390 2. If a redirect router sets up file or pipe deliveries for more than one
1391 incoming address, and the relevant transport has batch_max set greater than
1392 one, a batch delivery now occurs.
1394 3. The appendfile transport has a new option called maildirfolder_create_regex.
1395 Its value is a regular expression. For a maildir delivery, this is matched
1396 against the maildir directory; if it matches, Exim ensures that a
1397 maildirfolder file is created alongside the new, cur, and tmp directories.
1403 The documentation is up-to-date for the 4.61 release. Major new features since
1404 the 4.60 release are:
1406 . An option called disable_ipv6, to disable the use of IPv6 completely.
1408 . An increase in the number of ACL variables to 20 of each type.
1410 . A change to use $auth1, $auth2, and $auth3 in authenticators instead of $1,
1411 $2, $3, (though those are still set) because the numeric variables get used
1412 for other things in complicated expansions.
1414 . The default for rfc1413_query_timeout has been changed from 30s to 5s.
1416 . It is possible to use setclassresources() on some BSD OS to control the
1417 resources used in pipe deliveries.
1419 . A new ACL modifier called add_header, which can be used with any verb.
1421 . More errors are detectable in retry rules.
1423 There are a number of other additions too.
1429 The documentation is up-to-date for the 4.60 release. Major new features since
1430 the 4.50 release are:
1432 . Support for SQLite.
1434 . Support for IGNOREQUOTA in LMTP.
1436 . Extensions to the "submission mode" features.
1438 . Support for Client SMTP Authorization (CSA).
1440 . Support for ratelimiting hosts and users.
1442 . New expansion items to help with the BATV "prvs" scheme.
1444 . A "match_ip" condition, that matches an IP address against a list.
1446 There are many more minor changes.