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 expansion-test faciility (exim -be) can set variables.
17 1. A new ACL condition: seen. Records/tests a timestamp against a key.
19 2. A variant of the "mask" expansion operator to give normalised IPv6.
21 3. UTC output option for exim_dumpdb, exim_fixdb.
23 4. An event for failing TLS connects to the daemon.
25 5. The ACL "debug" control gains options "stop", "pretrigger" and "trigger".
27 6. Query-style lookups are now checked for quoting, if the query string is
28 built using untrusted data ("tainted"). For now lack of quoting is merely
29 logged; a future release will upgrade this to an error.
31 7. The expansion conditions match_<list-type> and inlist now set $value for
32 the expansion of the "true" result of the ${if}. With a static list, this
33 can be used for de-tainting.
35 8. Recipient verify callouts now set $domain_data & $local_part_data, with
41 1. The fast-ramp two phase queue run support, previously experimental, is
42 now supported by default.
44 2. The native SRS support, previously experimental, is now supported. It is
45 not built unless specified in the Local/Makefile.
47 3. TLS resumption support, previously experimental, is now supported and
48 included in default builds.
50 4. Single-key LMDB lookups, previously experimental, are now supported.
51 The support is not built unless specified in the Local/Makefile.
53 5. Option "message_linelength_limit" on the smtp transport to enforce (by
54 default) the RFC 998 character limit.
56 6. An option to ignore the cache on a lookup.
58 7. Quota checking during reception (i.e. at SMTP time) for appendfile-
59 transport-managed quotas.
61 8. Sqlite lookups accept a "file=<path>" option to specify a per-operation
62 db file, replacing the previous prefix to the SQL string (which had
63 issues when the SQL used tainted values).
65 9. Lsearch lookups accept a "ret=full" option, to return both the portion
66 of the line matching the key, and the remainder.
68 10. A command-line option to have a daemon not create a notifier socket.
70 11. Faster TLS startup. When various configuration options contain no
71 expandable elements, the information can be preloaded and cached rather
72 than the previous behaviour of always loading at startup time for every
73 connection. This helps particularly for the CA bundle.
75 12. Proxy Protocol Timeout is configurable via "proxy_protocol_timeout"
78 13. Option "smtp_accept_max_per_connection" is now expanded.
80 14. Log selector "queue_time_exclusive", enabled by default, to exclude the
81 time taken for reception from QT log elements.
83 15. Main option "smtp_backlog_monitor", to set a level above which listen
84 socket backlogs are logged.
86 16. Main option "hosts_require_helo", requiring HELO or EHLO before MAIL.
88 17. A main config option "allow_insecure_tainted_data" allows to turn
90 18. TLS ALPN handling. By default, refuse TLS connections that try to specify
91 a non-smtp (eg. http) use. Options for customising.
93 19. Support for MacOS (darwin) has been dropped.
99 1. EXPERIMENTAL_SRS_NATIVE optional build feature. See the experimental.spec
102 2. Channel-binding for authenticators is now supported under OpenSSL.
103 Previously it was GnuTLS-only.
105 3. A msg:defer event.
107 4. Client-side support in the gsasl authenticator. Tested against the
108 plaintext driver for PLAIN; only against itself for SCRAM-SHA-1 and
109 SCRAM-SHA-1-PLUS methods.
111 5. Server-side support in the gsasl authenticator for encrypted passwords, as
112 an alternate for the existing plaintext.
114 6. Variable $local_part_data now also set by router check_local_user option,
115 with an de-tainted version of $local_part.
117 7. Named-list definitions can now be prefixed "hide" so that "-bP" commands do
118 not output the content. Previously this could only be done on options.
120 8. As an experimental feature, the dovecot authentication driver supports inet
121 sockets. Previously it was unix-domain sockets only.
123 9. The ACL control "queue_only" can also be spelled "queue", and now takes an
124 option "first_pass_route" to do the same as a "-odqs" on the command line.
126 10. Items specified for the router and transport headers_remove option can use
127 a trailing asterisk to specify globbing.
129 11. New $queue_size variable.
131 12. New variables $local_part_{pre,suf}fix_v.
133 13. New main option "sqlite_dbfile", for use in preference to prefixing the
134 lookup string. The older method fails when tainted variables are used
135 in the lookup, as the filename becomes tainted. The new method keeps the
138 14. Options on the dsearch lookup, to return the full path and to filter
139 filetypes for matching.
141 15. Options on pgsql and mysql lookups, to specify server separate from the
144 16. An option on all single-key lookups, to return (on a hit) a de-tainted
145 version of the lookup key rather than the looked-up data.
147 17. $domain_data and $local_part_data are now set by all list-match successes.
148 Previously only list items that performed lookups did so.
149 Also, matching list items that are tail-match or RE-match now set the
150 numeric variables $0 (etc) in the same way os other RE matches.
152 18. Expansion item ${listquote {<char} {<item>}}.
154 19. An option for the ${readsocket {}{}{}} expansion to make the result data
157 20. dkim_verify_min_keysizes, a list of minimum acceptable public-key sizes.
159 21. bounce_message_file and warn_message_file are now expanded before use.
161 22. New main config option spf_smtp_comment_template to customise the
162 $spf_smtp_comment variable
169 1. An "external" authenticator, per RFC 4422 Appendix A.
171 2. A JSON lookup type, and JSON variants of the forall/any expansion conditions.
173 3. Variables $tls_in_cipher_std, $tls_out_cipher_std giving the RFC names
176 4. Log_selectors "msg_id" (on by default) and "msg_id_created".
178 5. A case_insensitive option for verify=not_blind.
180 6. EXPERIMENTAL_TLS_RESUME optional build feature. See the experimental.spec
183 7. A main option exim_version to override the version Exim
184 reports in verious places ($exim_version, $version_number).
186 8. Expansion operator ${sha2_N:} for N=256, 384, 512.
188 9. Router variables, $r_... settable from router options and usable in routers
191 10. The spf lookup now supports IPv6.
193 11. Main options for DKIM verify to filter hash and key types.
195 12. With TLS1.3, support for full-chain OCSP stapling.
197 13. Dual-certificate stacks on servers now support OCSP stapling, under OpenSSL.
199 14: An smtp:ehlo transport event, for observability of the remote offered features.
201 15: Support under OpenSSL for writing NSS-style key files for packet-capture
202 decode. The environment variable SSLKEYLOGFILE is used; if an absolute path
203 it must indicate a file under the spool directory; if relative the the spool
204 directory is prepended. Works on the server side only. Support under
205 GnuTLS was already there, being done purely by the library (server side
206 only, and exim must be run as root).
208 16: Command-line option to move messages from one named queue to another.
210 17. Variables $tls_in_ver, $tls_out_ver.
216 1. ${l_header:<name>} and ${l_h:<name>} expansion items, giving a colon-sep
217 list when there are multiple headers having a given name. This matters
218 when individual headers are wrapped onto multiple lines; with previous
219 facilities hard to parse.
221 2. The ${readsocket } expansion item now takes a "tls" option, doing the
224 3. EXPERIMENTAL_REQUIRETLS and EXPERIMENTAL_PIPE_CONNECT optional build
225 features. See the experimental.spec file.
227 4. If built with SUPPORT_I18N a "utf8_downconvert" option on the smtp transport.
229 5. A "pipelining" log_selector.
231 6. Builtin macros for supported log_selector and openssl_options values.
233 7. JSON variants of the ${extract } expansion item.
235 8. A "noutf8" debug option, for disabling the UTF-8 characters in debug output.
237 9. TCP Fast Open support on MacOS.
242 1. Dual-certificate stacks on servers now support OCSP stapling, under GnuTLS
243 version 3.5.6 or later.
245 2. DANE is now supported under GnuTLS version 3.0.0 or later. Both GnuTLS and
246 OpenSSL versions are moved to mainline support from Experimental.
247 New SMTP transport option "dane_require_tls_ciphers".
249 3. Feature macros for the compiled-in set of malware scanner interfaces.
251 4. SPF support is promoted from Experimental to mainline status. The template
252 src/EDITME makefile does not enable its inclusion.
254 5. Logging control for DKIM verification. The existing DKIM log line is
255 controlled by a "dkim_verbose" selector which is _not_ enabled by default.
256 A new tag "DKIM=<domain>" is added to <= lines by default, controlled by
257 a "dkim" log_selector.
259 6. Receive duration on <= lines, under a new log_selector "receive_time".
261 7. Options "ipv4_only" and "ipv4_prefer" on the dnslookup router and on
262 routing rules in the manualroute router.
264 8. Expansion item ${sha3:<string>} / ${sha3_<N>:<string>} now also supported
265 under OpenSSL version 1.1.1 or later.
267 9. DKIM operations can now use the Ed25519 algorithm in addition to RSA, under
268 GnuTLS 3.6.0 or OpenSSL 1.1.1 or later.
270 10. Builtin feature-macros _CRYPTO_HASH_SHA3 and _CRYPTO_SIGN_ED25519, library
273 11. "exim -bP macro <name>" returns caller-usable status.
275 12. Expansion item ${authresults {<machine>}} for creating an
276 Authentication-Results: header.
278 13. EXPERIMENTAL_ARC. See the experimental.spec file.
279 See also new util/renew-opendmarc-tlds.sh script for use with DMARC/ARC.
281 14: A dane:fail event, intended to facilitate reporting.
283 15. "Lightweight" support for Redis Cluster. Requires redis_servers list to
284 contain all the servers in the cluster, all of which must be reachable from
285 the running exim instance. If the cluster has master/slave replication, the
286 list must contain all the master and slave servers.
288 16. Add an option to the Avast scanner interface: "pass_unscanned". This
289 allows to treat unscanned files as clean. Files may be unscanned for
290 several reasons: decompression bombs, broken archives.
296 1. PKG_CONFIG_PATH can now be set in Local/Makefile;
297 wildcards will be expanded, values are collapsed.
299 2. The ${readsocket } expansion now takes an option to not shutdown the
300 connection after sending the query string. The default remains to do so.
302 3. An smtp transport option "hosts_noproxy_tls" to control whether multiple
303 deliveries on a single TCP connection can maintain a TLS connection
304 open. By default disabled for all hosts, doing so saves the cost of
305 making new TLS sessions, at the cost of having to proxy the data via
306 another process. Logging is also affected.
308 4. A malware connection type for the FPSCAND protocol.
310 5. An option for recipient verify callouts to hold the connection open for
311 further recipients and for delivery.
313 6. The reproducible build $SOURCE_DATE_EPOCH environment variable is now
316 7. Optionally, an alternate format for spool data-files which matches the
317 wire format - meaning more efficient reception and transmission (at the
318 cost of difficulty with standard Unix tools). Only used for messages
319 received using the ESMTP CHUNKING option, and when a new main-section
320 option "spool_wireformat" (false by default) is set.
322 8. New main configuration option "commandline_checks_require_admin" to
323 restrict who can use various introspection options.
325 9. New option modifier "no_check" for quota and quota_filecount
326 appendfile transport.
328 10. Variable $smtp_command_history returning a comma-sep list of recent
331 11. Millisecond timetamps in logs, on log_selector "millisec". Also affects
332 log elements QT, DT and D, and timstamps in debug output.
334 12. TCP Fast Open logging. As a server, logs when the SMTP banner was sent
335 while still in SYN_RECV state; as a client logs when the connection
336 is opened with a TFO cookie.
338 13. DKIM support for multiple signing, by domain and/or key-selector.
339 DKIM support for multiple hashes, and for alternate-identity tags.
340 Builtin macro with default list of signed headers.
341 Better syntax for specifying oversigning.
342 The DKIM ACL can override verification status, and status is visible in
345 14. Exipick understands -C|--config for an alternative Exim
348 15. TCP Fast Open used, with data-on-SYN, for client SMTP via SOCKS5 proxy,
349 for ${readsocket } expansions, and for ClamAV.
351 16. The "-be" expansion test mode now supports macros. Macros are expanded
352 in test lines, and new macros can be defined.
354 17. Support for server-side dual-certificate-stacks (eg. RSA + ECDSA).
360 1. Allow relative config file names for ".include"
362 2. A main-section config option "debug_store" to control the checks on
363 variable locations during store-reset. Normally false but can be enabled
364 when a memory corruption issue is suspected on a production system.
370 1. The new perl_taintmode option allows to run the embedded perl
371 interpreter in taint mode.
373 2. New log_selector: dnssec, adds a "DS" tag to acceptance and delivery lines.
375 3. Speculative debugging, via a "kill" option to the "control=debug" ACL
378 4. New expansion item ${sha3:<string>} / ${sha3_<N>:<string>}.
379 N can be 224, 256 (default), 384, 512.
380 With GnuTLS 3.5.0 or later, only.
382 5. Facility for named queues: A command-line argument can specify
383 the queue name for a queue operation, and an ACL modifier can set
384 the queue to be used for a message. A $queue_name variable gives
387 6. New expansion operators base32/base32d.
389 7. The CHUNKING ESMTP extension from RFC 3030. May give some slight
390 performance increase and network load decrease. Main config option
391 chunking_advertise_hosts, and smtp transport option hosts_try_chunking
394 8. LMDB lookup support, as Experimental. Patch supplied by Andrew Colin Kissa.
396 9. Expansion operator escape8bit, like escape but not touching newline etc..
398 10. Feature macros, generated from compile options. All start with "_HAVE_"
399 and go on with some roughly recognisable name. Driver macros, for
400 router, transport and authentication drivers; names starting with "_DRIVER_".
401 Option macros, for each configuration-file option; all start with "_OPT_".
402 Use the "-bP macros" command-line option to see what is present.
404 11. Integer values for options can take a "G" multiplier.
406 12. defer=pass option for the ACL control cutthrough_delivery, to reflect 4xx
407 returns from the target back to the initiator, rather than spooling the
410 13. New built-in constants available for tls_dhparam and default changed.
412 14. If built with EXPERIMENTAL_QUEUEFILE, a queuefile transport, for writing
413 out copies of the message spool files for use by 3rd-party scanners.
415 15. A new option on the smtp transport, hosts_try_fastopen. If the system
416 supports it (on Linux it must be enabled in the kernel by the sysadmin)
417 try to use RFC 7413 "TCP Fast Open". No data is sent on the SYN segment
418 but it permits a peer that also supports the facility to send its SMTP
419 banner immediately after the SYN,ACK segment rather then waiting for
420 another ACK - so saving up to one roundtrip time. Because it requires
421 previous communication with the peer (we save a cookie from it) this
422 will only become active on frequently-contacted destinations.
424 16. A new syslog_pid option to suppress PID duplication in syslog lines.
430 1. The ACL conditions regex and mime_regex now capture substrings
431 into numeric variables $regex1 to 9, like the "match" expansion condition.
433 2. New $callout_address variable records the address used for a spam=,
434 malware= or verify= callout.
436 3. Transports now take a "max_parallel" option, to limit concurrency.
438 4. Expansion operators ${ipv6norm:<string>} and ${ipv6denorm:<string>}.
439 The latter expands to a 8-element colon-sep set of hex digits including
440 leading zeroes. A trailing ipv4-style dotted-decimal set is converted
441 to hex. Pure ipv4 addresses are converted to IPv4-mapped IPv6.
442 The former operator strips leading zeroes and collapses the longest
443 set of 0-groups to a double-colon.
445 5. New "-bP config" support, to dump the effective configuration.
447 6. New $dkim_key_length variable.
449 7. New base64d and base64 expansion items (the existing str2b64 being a
450 synonym of the latter). Add support in base64 for certificates.
452 8. New main configuration option "bounce_return_linesize_limit" to
453 avoid oversize bodies in bounces. The default value matches RFC
456 9. New $initial_cwd expansion variable.
462 1. Support for using the system standard CA bundle.
464 2. New expansion items $config_file, $config_dir, containing the file
465 and directory name of the main configuration file. Also $exim_version.
467 3. New "malware=" support for Avast.
469 4. New "spam=" variant option for Rspamd.
471 5. Assorted options on malware= and spam= scanners.
473 6. A command-line option to write a comment into the logfile.
475 7. If built with EXPERIMENTAL_SOCKS feature enabled, the smtp transport can
476 be configured to make connections via socks5 proxies.
478 8. If built with EXPERIMENTAL_INTERNATIONAL, support is included for
479 the transmission of UTF-8 envelope addresses.
481 9. If built with EXPERIMENTAL_INTERNATIONAL, an expansion item for a commonly
482 used encoding of Maildir folder names.
484 10. A logging option for slow DNS lookups.
486 11. New ${env {<variable>}} expansion.
488 12. A non-SMTP authenticator using information from TLS client certificates.
490 13. Main option "tls_eccurve" for selecting an Elliptic Curve for TLS.
491 Patch originally by Wolfgang Breyha.
493 14. Main option "dns_trust_aa" for trusting your local nameserver at the
494 same level as DNSSEC.
499 1. If built with EXPERIMENTAL_DANE feature enabled, Exim will follow the
500 DANE SMTP draft to assess a secure chain of trust of the certificate
501 used to establish the TLS connection based on a TLSA record in the
502 domain of the sender.
504 2. The EXPERIMENTAL_TPDA feature has been renamed to EXPERIMENTAL_EVENT
505 and several new events have been created. The reason is because it has
506 been expanded beyond just firing events during the transport phase. Any
507 existing TPDA transport options will have to be rewritten to use a new
508 $event_name expansion variable in a condition. Refer to the
509 experimental-spec.txt for details and examples.
511 3. The EXPERIMENTAL_CERTNAMES features is an enhancement to verify that
512 server certs used for TLS match the result of the MX lookup. It does
513 not use the same mechanism as DANE.
523 1. If built with the EXPERIMENTAL_PROXY feature enabled, Exim can be
524 configured to expect an initial header from a proxy that will make the
525 actual external source IP:host be used in exim instead of the IP of the
526 proxy that is connecting to it.
528 2. New verify option header_names_ascii, which will check to make sure
529 there are no non-ASCII characters in header names. Exim itself handles
530 those non-ASCII characters, but downstream apps may not, so Exim can
531 detect and reject if those characters are present.
533 3. New expansion operator ${utf8clean:string} to replace malformed UTF8
534 codepoints with valid ones.
536 4. New malware type "sock". Talks over a Unix or TCP socket, sending one
537 command line and matching a regex against the return data for trigger
538 and a second regex to extract malware_name. The mail spoolfile name can
539 be included in the command line.
541 5. The smtp transport now supports options "tls_verify_hosts" and
542 "tls_try_verify_hosts". If either is set the certificate verification
543 is split from the encryption operation. The default remains that a failed
544 verification cancels the encryption.
546 6. New SERVERS override of default ldap server list. In the ACLs, an ldap
547 lookup can now set a list of servers to use that is different from the
550 7. New command-line option -C for exiqgrep to specify alternate exim.conf
551 file when searching the queue.
553 8. OCSP now supports GnuTLS also, if you have version 3.1.3 or later of that.
555 9. Support for DNSSEC on outbound connections.
557 10. New variables "tls_(in,out)_(our,peer)cert" and expansion item
558 "certextract" to extract fields from them. Hash operators md5 and sha1
559 work over them for generating fingerprints, and a new sha256 operator
562 11. PRDR is now supported dy default.
564 12. OCSP stapling is now supported by default.
566 13. If built with the EXPERIMENTAL_DSN feature enabled, Exim will output
567 Delivery Status Notification messages in MIME format, and negotiate
568 DSN features per RFC 3461.
574 1. New command-line option -bI:sieve will list all supported sieve extensions
575 of this Exim build on standard output, one per line.
576 ManageSieve (RFC 5804) providers managing scripts for use by Exim should
577 query this to establish the correct list to include in the protocol's
578 SIEVE capability line.
580 2. If the -n option is combined with the -bP option, then the name of an
581 emitted option is not output, only the value (if visible to you).
582 For instance, "exim -n -bP pid_file_path" should just emit a pathname
583 followed by a newline, and no other text.
585 3. When built with SUPPORT_TLS and USE_GNUTLS, the SMTP transport driver now
586 has a "tls_dh_min_bits" option, to set the minimum acceptable number of
587 bits in the Diffie-Hellman prime offered by a server (in DH ciphersuites)
588 acceptable for security. (Option accepted but ignored if using OpenSSL).
589 Defaults to 1024, the old value. May be lowered only to 512, or raised as
590 far as you like. Raising this may hinder TLS interoperability with other
591 sites and is not currently recommended. Lowering this will permit you to
592 establish a TLS session which is not as secure as you might like.
594 Unless you really know what you are doing, leave it alone.
596 4. If not built with DISABLE_DNSSEC, Exim now has the main option
597 dns_dnssec_ok; if set to 1 then Exim will initialise the resolver library
598 to send the DO flag to your recursive resolver. If you have a recursive
599 resolver, which can set the Authenticated Data (AD) flag in results, Exim
600 can now detect this. Exim does not perform validation itself, instead
601 relying upon a trusted path to the resolver.
603 Current status: work-in-progress; $sender_host_dnssec variable added.
605 5. DSCP support for outbound connections: on a transport using the smtp driver,
606 set "dscp = ef", for instance, to cause the connections to have the relevant
607 DSCP (IPv4 TOS or IPv6 TCLASS) value in the header.
609 Similarly for inbound connections, there is a new control modifier, dscp,
610 so "warn control = dscp/ef" in the connect ACL, or after authentication.
612 Supported values depend upon system libraries. "exim -bI:dscp" to list the
613 ones Exim knows of. You can also set a raw number 0..0x3F.
615 6. The -G command-line flag is no longer ignored; it is now equivalent to an
616 ACL setting "control = suppress_local_fixups". The -L command-line flag
617 is now accepted and forces use of syslog, with the provided tag as the
618 process name. A few other flags used by Sendmail are now accepted and
621 7. New cutthrough routing feature. Requested by a "control = cutthrough_delivery"
622 ACL modifier; works for single-recipient mails which are received on and
623 deliverable via SMTP. Using the connection made for a recipient verify,
624 if requested before the verify, or a new one made for the purpose while
625 the inbound connection is still active. The bulk of the mail item is copied
626 direct from the inbound socket to the outbound (as well as the spool file).
627 When the source notifies the end of data, the data acceptance by the destination
628 is negotiated before the acceptance is sent to the source. If the destination
629 does not accept the mail item, for example due to content-scanning, the item
630 is not accepted from the source and therefore there is no need to generate
631 a bounce mail. This is of benefit when providing a secondary-MX service.
632 The downside is that delays are under the control of the ultimate destination
635 The Received-by: header on items delivered by cutthrough is generated
636 early in reception rather than at the end; this will affect any timestamp
637 included. The log line showing delivery is recorded before that showing
638 reception; it uses a new ">>" tag instead of "=>".
640 To support the feature, verify-callout connections can now use ESMTP and TLS.
641 The usual smtp transport options are honoured, plus a (new, default everything)
642 hosts_verify_avoid_tls.
644 New variable families named tls_in_cipher, tls_out_cipher etc. are introduced
645 for specific access to the information for each connection. The old names
646 are present for now but deprecated.
648 Not yet supported: IGNOREQUOTA, SIZE, PIPELINING.
650 8. New expansion operators ${listnamed:name} to get the content of a named list
651 and ${listcount:string} to count the items in a list.
653 9. New global option "gnutls_allow_auto_pkcs11", defaults false. The GnuTLS
654 rewrite in 4.80 combines with GnuTLS 2.12.0 or later, to autoload PKCS11
655 modules. For some situations this is desirable, but we expect admin in
656 those situations to know they want the feature. More commonly, it means
657 that GUI user modules get loaded and are broken by the setuid Exim being
658 unable to access files specified in environment variables and passed
659 through, thus breakage. So we explicitly inhibit the PKCS11 initialisation
660 unless this new option is set.
662 Some older OS's with earlier versions of GnuTLS might not have pkcs11 ability,
663 so have also added a build option which can be used to build Exim with GnuTLS
664 but without trying to use any kind of PKCS11 support. Uncomment this in the
667 AVOID_GNUTLS_PKCS11=yes
669 10. The "acl = name" condition on an ACL now supports optional arguments.
670 New expansion item "${acl {name}{arg}...}" and expansion condition
671 "acl {{name}{arg}...}" are added. In all cases up to nine arguments
672 can be used, appearing in $acl_arg1 to $acl_arg9 for the called ACL.
673 Variable $acl_narg contains the number of arguments. If the ACL sets
674 a "message =" value this becomes the result of the expansion item,
675 or the value of $value for the expansion condition. If the ACL returns
676 accept the expansion condition is true; if reject, false. A defer
677 return results in a forced fail.
679 11. Routers and transports can now have multiple headers_add and headers_remove
680 option lines. The concatenated list is used.
682 12. New ACL modifier "remove_header" can remove headers before message gets
683 handled by routers/transports.
685 13. New dnsdb lookup pseudo-type "a+". A sequence of "a6" (if configured),
686 "aaaa" and "a" lookups is done and the full set of results returned.
688 14. New expansion variable $headers_added with content from ACL add_header
689 modifier (but not yet added to message).
691 15. New 8bitmime status logging option for received messages. Log field "M8S".
693 16. New authenticated_sender logging option, adding to log field "A".
695 17. New expansion variables $router_name and $transport_name. Useful
696 particularly for debug_print as -bt command-line option does not
697 require privilege whereas -d does.
699 18. If built with EXPERIMENTAL_PRDR, per-recipient data responses per a
700 proposed extension to SMTP from Eric Hall.
702 19. The pipe transport has gained the force_command option, to allow
703 decorating commands from user .forward pipe aliases with prefix
704 wrappers, for instance.
706 20. Callout connections can now AUTH; the same controls as normal delivery
709 21. Support for DMARC, using opendmarc libs, can be enabled. It adds new
710 options: dmarc_forensic_sender, dmarc_history_file, and dmarc_tld_file.
711 It adds new expansion variables $dmarc_ar_header, $dmarc_status,
712 $dmarc_status_text, and $dmarc_used_domain. It adds a new acl modifier
713 dmarc_status. It adds new control flags dmarc_disable_verify and
714 dmarc_enable_forensic. The default for the dmarc_tld_file option is
715 "/etc/exim/opendmarc.tlds" and can be changed via EDITME.
717 22. Add expansion variable $authenticated_fail_id, which is the username
718 provided to the authentication method which failed. It is available
719 for use in subsequent ACL processing (typically quit or notquit ACLs).
721 23. New ACL modifier "udpsend" can construct a UDP packet to send to a given
724 24. New ${hexquote:..string..} expansion operator converts non-printable
725 characters in the string to \xNN form.
727 25. Experimental TPDA (Transport Post Delivery Action) function added.
728 Patch provided by Axel Rau.
730 26. Experimental Redis lookup added. Patch provided by Warren Baker.
736 1. New authenticator driver, "gsasl". Server-only (at present).
737 This is a SASL interface, licensed under GPL, which can be found at
738 http://www.gnu.org/software/gsasl/.
739 This system does not provide sources of data for authentication, so
740 careful use needs to be made of the conditions in Exim.
742 2. New authenticator driver, "heimdal_gssapi". Server-only.
743 A replacement for using cyrus_sasl with Heimdal, now that $KRB5_KTNAME
744 is no longer honoured for setuid programs by Heimdal. Use the
745 "server_keytab" option to point to the keytab.
747 3. The "pkg-config" system can now be used when building Exim to reference
748 cflags and library information for lookups and authenticators, rather
749 than having to update "CFLAGS", "AUTH_LIBS", "LOOKUP_INCLUDE" and
750 "LOOKUP_LIBS" directly. Similarly for handling the TLS library support
751 without adjusting "TLS_INCLUDE" and "TLS_LIBS".
753 In addition, setting PCRE_CONFIG=yes will query the pcre-config tool to
754 find the headers and libraries for PCRE.
756 4. New expansion variable $tls_bits.
758 5. New lookup type, "dbmjz". Key is an Exim list, the elements of which will
759 be joined together with ASCII NUL characters to construct the key to pass
760 into the DBM library. Can be used with gsasl to access sasldb2 files as
763 6. OpenSSL now supports TLS1.1 and TLS1.2 with OpenSSL 1.0.1.
765 Avoid release 1.0.1a if you can. Note that the default value of
766 "openssl_options" is no longer "+dont_insert_empty_fragments", as that
767 increased susceptibility to attack. This may still have interoperability
768 implications for very old clients (see version 4.31 change 37) but
769 administrators can choose to make the trade-off themselves and restore
770 compatibility at the cost of session security.
772 7. Use of the new expansion variable $tls_sni in the main configuration option
773 tls_certificate will cause Exim to re-expand the option, if the client
774 sends the TLS Server Name Indication extension, to permit choosing a
775 different certificate; tls_privatekey will also be re-expanded. You must
776 still set these options to expand to valid files when $tls_sni is not set.
778 The SMTP Transport has gained the option tls_sni, which will set a hostname
779 for outbound TLS sessions, and set $tls_sni too.
781 A new log_selector, +tls_sni, has been added, to log received SNI values
782 for Exim as a server.
784 8. The existing "accept_8bitmime" option now defaults to true. This means
785 that Exim is deliberately not strictly RFC compliant. We're following
786 Dan Bernstein's advice in http://cr.yp.to/smtp/8bitmime.html by default.
787 Those who disagree, or know that they are talking to mail servers that,
788 even today, are not 8-bit clean, need to turn off this option.
790 9. Exim can now be started with -bw (with an optional timeout, given as
791 -bw<timespec>). With this, stdin at startup is a socket that is
792 already listening for connections. This has a more modern name of
793 "socket activation", but forcing the activated socket to fd 0. We're
794 interested in adding more support for modern variants.
796 10. ${eval } now uses 64-bit values on supporting platforms. A new "G" suffix
797 for numbers indicates multiplication by 1024^3.
799 11. The GnuTLS support has been revamped; the three options gnutls_require_kx,
800 gnutls_require_mac & gnutls_require_protocols are no longer supported.
801 tls_require_ciphers is now parsed by gnutls_priority_init(3) as a priority
802 string, documentation for which is at:
803 http://www.gnutls.org/manual/html_node/Priority-Strings.html
805 SNI support has been added to Exim's GnuTLS integration too.
807 For sufficiently recent GnuTLS libraries, ${randint:..} will now use
808 gnutls_rnd(), asking for GNUTLS_RND_NONCE level randomness.
810 12. With OpenSSL, if built with EXPERIMENTAL_OCSP, a new option tls_ocsp_file
811 is now available. If the contents of the file are valid, then Exim will
812 send that back in response to a TLS status request; this is OCSP Stapling.
813 Exim will not maintain the contents of the file in any way: administrators
814 are responsible for ensuring that it is up-to-date.
816 See "experimental-spec.txt" for more details.
818 13. ${lookup dnsdb{ }} supports now SPF record types. They are handled
819 identically to TXT record lookups.
821 14. New expansion variable $tod_epoch_l for higher-precision time.
823 15. New global option tls_dh_max_bits, defaulting to current value of NSS
824 hard-coded limit of DH ephemeral bits, to fix interop problems caused by
825 GnuTLS 2.12 library recommending a bit count higher than NSS supports.
827 16. tls_dhparam now used by both OpenSSL and GnuTLS, can be path or identifier.
828 Option can now be a path or an identifier for a standard prime.
829 If unset, we use the DH prime from section 2.2 of RFC 5114, "ike23".
830 Set to "historic" to get the old GnuTLS behaviour of auto-generated DH
833 17. SSLv2 now disabled by default in OpenSSL. (Never supported by GnuTLS).
834 Use "openssl_options -no_sslv2" to re-enable support, if your OpenSSL
835 install was not built with OPENSSL_NO_SSL2 ("no-ssl2").
841 1. New options for the ratelimit ACL condition: /count= and /unique=.
842 The /noupdate option has been replaced by a /readonly option.
844 2. The SMTP transport's protocol option may now be set to "smtps", to
845 use SSL-on-connect outbound.
847 3. New variable $av_failed, set true if the AV scanner deferred; ie, when
848 there is a problem talking to the AV scanner, or the AV scanner running.
850 4. New expansion conditions, "inlist" and "inlisti", which take simple lists
851 and check if the search item is a member of the list. This does not
852 support named lists, but does subject the list part to string expansion.
854 5. Unless the new EXPAND_LISTMATCH_RHS build option is set when Exim was
855 built, Exim no longer performs string expansion on the second string of
856 the match_* expansion conditions: "match_address", "match_domain",
857 "match_ip" & "match_local_part". Named lists can still be used.
863 1. The global option "dns_use_edns0" may be set to coerce EDNS0 usage on
864 or off in the resolver library.
870 1. In addition to the existing LDAP and LDAP/SSL ("ldaps") support, there
871 is now LDAP/TLS support, given sufficiently modern OpenLDAP client
872 libraries. The following global options have been added in support of
873 this: ldap_ca_cert_dir, ldap_ca_cert_file, ldap_cert_file, ldap_cert_key,
874 ldap_cipher_suite, ldap_require_cert, ldap_start_tls.
876 2. The pipe transport now takes a boolean option, "freeze_signal", default
877 false. When true, if the external delivery command exits on a signal then
878 Exim will freeze the message in the queue, instead of generating a bounce.
880 3. Log filenames may now use %M as an escape, instead of %D (still available).
881 The %M pattern expands to yyyymm, providing month-level resolution.
883 4. The $message_linecount variable is now updated for the maildir_tag option,
884 in the same way as $message_size, to reflect the real number of lines,
885 including any header additions or removals from transport.
887 5. When contacting a pool of SpamAssassin servers configured in spamd_address,
888 Exim now selects entries randomly, to better scale in a cluster setup.
894 1. SECURITY FIX: privilege escalation flaw fixed. On Linux (and only Linux)
895 the flaw permitted the Exim run-time user to cause root to append to
896 arbitrary files of the attacker's choosing, with the content based
897 on content supplied by the attacker.
899 2. Exim now supports loading some lookup types at run-time, using your
900 platform's dlopen() functionality. This has limited platform support
901 and the intention is not to support every variant, it's limited to
902 dlopen(). This permits the main Exim binary to not be linked against
903 all the libraries needed for all the lookup types.
909 NOTE: this version is not guaranteed backwards-compatible, please read the
910 items below carefully
912 1. A new main configuration option, "openssl_options", is available if Exim
913 is built with SSL support provided by OpenSSL. The option allows
914 administrators to specify OpenSSL options to be used on connections;
915 typically this is to set bug compatibility features which the OpenSSL
916 developers have not enabled by default. There may be security
917 consequences for certain options, so these should not be changed
920 2. A new pipe transport option, "permit_coredumps", may help with problem
921 diagnosis in some scenarios. Note that Exim is typically installed as
922 a setuid binary, which on most OSes will inhibit coredumps by default,
923 so that safety mechanism would have to be overridden for this option to
924 be able to take effect.
926 3. ClamAV 0.95 is now required for ClamAV support in Exim, unless
927 Local/Makefile sets: WITH_OLD_CLAMAV_STREAM=yes
928 Note that this switches Exim to use a new API ("INSTREAM") and a future
929 release of ClamAV will remove support for the old API ("STREAM").
931 The av_scanner option, when set to "clamd", now takes an optional third
932 part, "local", which causes Exim to pass a filename to ClamAV instead of
933 the file content. This is the same behaviour as when clamd is pointed at
934 a Unix-domain socket. For example:
936 av_scanner = clamd:192.0.2.3 1234:local
938 ClamAV's ExtendedDetectionInfo response format is now handled.
940 4. There is now a -bmalware option, restricted to admin users. This option
941 takes one parameter, a filename, and scans that file with Exim's
942 malware-scanning framework. This is intended purely as a debugging aid
943 to ensure that Exim's scanning is working, not to replace other tools.
944 Note that the ACL framework is not invoked, so if av_scanner references
945 ACL variables without a fallback then this will fail.
947 5. There is a new expansion operator, "reverse_ip", which will reverse IP
948 addresses; IPv4 into dotted quad, IPv6 into dotted nibble. Examples:
950 ${reverse_ip:192.0.2.4}
952 ${reverse_ip:2001:0db8:c42:9:1:abcd:192.0.2.3}
953 -> 3.0.2.0.0.0.0.c.d.c.b.a.1.0.0.0.9.0.0.0.2.4.c.0.8.b.d.0.1.0.0.2
955 6. There is a new ACL control called "debug", to enable debug logging.
956 This allows selective logging of certain incoming transactions within
957 production environments, with some care. It takes two options, "tag"
958 and "opts"; "tag" is included in the filename of the log and "opts"
959 is used as per the -d<options> command-line option. Examples, which
960 don't all make sense in all contexts:
963 control = debug/tag=.$sender_host_address
964 control = debug/opts=+expand+acl
965 control = debug/tag=.$message_exim_id/opts=+expand
967 7. It has always been implicit in the design and the documentation that
968 "the Exim user" is not root. src/EDITME said that using root was
969 "very strongly discouraged". This is not enough to keep people from
970 shooting themselves in the foot in days when many don't configure Exim
971 themselves but via package build managers. The security consequences of
972 running various bits of network code are severe if there should be bugs in
973 them. As such, the Exim user may no longer be root. If configured
974 statically, Exim will refuse to build. If configured as ref:user then Exim
975 will exit shortly after start-up. If you must shoot yourself in the foot,
976 then henceforth you will have to maintain your own local patches to strip
979 8. There is a new expansion condition, bool_lax{}. Where bool{} uses the ACL
980 condition logic to determine truth/failure and will fail to expand many
981 strings, bool_lax{} uses the router condition logic, where most strings
983 Note: bool{00} is false, bool_lax{00} is true.
985 9. Routers now support multiple "condition" tests.
987 10. There is now a runtime configuration option "tcp_wrappers_daemon_name".
988 Setting this allows an admin to define which entry in the tcpwrappers
989 config file will be used to control access to the daemon. This option
990 is only available when Exim is built with USE_TCP_WRAPPERS. The
991 default value is set at build time using the TCP_WRAPPERS_DAEMON_NAME
994 11. [POSSIBLE CONFIG BREAKAGE] The default value for system_filter_user is now
995 the Exim run-time user, instead of root.
997 12. [POSSIBLE CONFIG BREAKAGE] ALT_CONFIG_ROOT_ONLY is no longer optional and
998 is forced on. This is mitigated by the new build option
999 TRUSTED_CONFIG_LIST which defines a list of configuration files which
1000 are trusted; one per line. If a config file is owned by root and matches
1001 a pathname in the list, then it may be invoked by the Exim build-time
1002 user without Exim relinquishing root privileges.
1004 13. [POSSIBLE CONFIG BREAKAGE] The Exim user is no longer automatically
1005 trusted to supply -D<Macro[=Value]> overrides on the command-line. Going
1006 forward, we recommend using TRUSTED_CONFIG_LIST with shim configs that
1007 include the main config. As a transition mechanism, we are temporarily
1008 providing a work-around: the new build option WHITELIST_D_MACROS provides
1009 a colon-separated list of macro names which may be overridden by the Exim
1010 run-time user. The values of these macros are constrained to the regex
1011 ^[A-Za-z0-9_/.-]*$ (which explicitly does allow for empty values).
1017 1. TWO SECURITY FIXES: one relating to mail-spools which are globally
1018 writable, the other to locking of MBX folders (not mbox).
1020 2. MySQL stored procedures are now supported.
1022 3. The dkim_domain transport option is now a list, not a single string, and
1023 messages will be signed for each element in the list (discarding
1026 4. The 4.70 release unexpectedly changed the behaviour of dnsdb TXT lookups
1027 in the presence of multiple character strings within the RR. Prior to 4.70,
1028 only the first string would be returned. The dnsdb lookup now, by default,
1029 preserves the pre-4.70 semantics, but also now takes an extended output
1030 separator specification. The separator can be followed by a semicolon, to
1031 concatenate the individual text strings together with no join character,
1032 or by a comma and a second separator character, in which case the text
1033 strings within a TXT record are joined on that second character.
1034 Administrators are reminded that DNS provides no ordering guarantees
1035 between multiple records in an RRset. For example:
1037 foo.example. IN TXT "a" "b" "c"
1038 foo.example. IN TXT "d" "e" "f"
1040 ${lookup dnsdb{>/ txt=foo.example}} -> "a/d"
1041 ${lookup dnsdb{>/; txt=foo.example}} -> "def/abc"
1042 ${lookup dnsdb{>/,+ txt=foo.example}} -> "a+b+c/d+e+f"
1048 1. Native DKIM support without an external library.
1049 (Note that if no action to prevent it is taken, a straight upgrade will
1050 result in DKIM verification of all signed incoming emails. See spec
1051 for details on conditionally disabling)
1053 2. Experimental DCC support via dccifd (contributed by Wolfgang Breyha).
1055 3. There is now a bool{} expansion condition which maps certain strings to
1056 true/false condition values (most likely of use in conjunction with the
1057 and{} expansion operator).
1059 4. The $spam_score, $spam_bar and $spam_report variables are now available
1062 5. exim -bP now supports "macros", "macro_list" or "macro MACRO_NAME" as
1063 options, provided that Exim is invoked by an admin_user.
1065 6. There is a new option gnutls_compat_mode, when linked against GnuTLS,
1066 which increases compatibility with older clients at the cost of decreased
1067 security. Don't set this unless you need to support such clients.
1069 7. There is a new expansion operator, ${randint:...} which will produce a
1070 "random" number less than the supplied integer. This randomness is
1071 not guaranteed to be cryptographically strong, but depending upon how
1072 Exim was built may be better than the most naive schemes.
1074 8. Exim now explicitly ensures that SHA256 is available when linked against
1077 9. The transport_filter_timeout option now applies to SMTP transports too.
1083 1. Preliminary DKIM support in Experimental.
1089 1. The body_linecount and body_zerocount C variables are now exported in the
1092 2. When a dnslists lookup succeeds, the key that was looked up is now placed
1093 in $dnslist_matched. When the key is an IP address, it is not reversed in
1094 this variable (though it is, of course, in the actual lookup). In simple
1097 deny dnslists = spamhaus.example
1099 the key is also available in another variable (in this case,
1100 $sender_host_address). In more complicated cases, however, this is not
1101 true. For example, using a data lookup might generate a dnslists lookup
1104 deny dnslists = spamhaus.example/<|192.168.1.2|192.168.6.7|...
1106 If this condition succeeds, the value in $dnslist_matched might be
1107 192.168.6.7 (for example).
1109 3. Authenticators now have a client_condition option. When Exim is running as
1110 a client, it skips an authenticator whose client_condition expansion yields
1111 "0", "no", or "false". This can be used, for example, to skip plain text
1112 authenticators when the connection is not encrypted by a setting such as:
1114 client_condition = ${if !eq{$tls_cipher}{}}
1116 Note that the 4.67 documentation states that $tls_cipher contains the
1117 cipher used for incoming messages. In fact, during SMTP delivery, it
1118 contains the cipher used for the delivery. The same is true for
1121 4. There is now a -Mvc <message-id> option, which outputs a copy of the
1122 message to the standard output, in RFC 2822 format. The option can be used
1123 only by an admin user.
1125 5. There is now a /noupdate option for the ratelimit ACL condition. It
1126 computes the rate and checks the limit as normal, but it does not update
1127 the saved data. This means that, in relevant ACLs, it is possible to lookup
1128 the existence of a specified (or auto-generated) ratelimit key without
1129 incrementing the ratelimit counter for that key.
1131 In order for this to be useful, another ACL entry must set the rate
1132 for the same key somewhere (otherwise it will always be zero).
1137 # Read the rate; if it doesn't exist or is below the maximum
1138 # we update it below
1139 deny ratelimit = 100 / 5m / strict / noupdate
1140 log_message = RATE: $sender_rate / $sender_rate_period \
1141 (max $sender_rate_limit)
1143 [... some other logic and tests...]
1145 warn ratelimit = 100 / 5m / strict / per_cmd
1146 log_message = RATE UPDATE: $sender_rate / $sender_rate_period \
1147 (max $sender_rate_limit)
1148 condition = ${if le{$sender_rate}{$sender_rate_limit}}
1152 6. The variable $max_received_linelength contains the number of bytes in the
1153 longest line that was received as part of the message, not counting the
1154 line termination character(s).
1156 7. Host lists can now include +ignore_defer and +include_defer, analogous to
1157 +ignore_unknown and +include_unknown. These options should be used with
1158 care, probably only in non-critical host lists such as whitelists.
1160 8. There's a new option called queue_only_load_latch, which defaults true.
1161 If set false when queue_only_load is greater than zero, Exim re-evaluates
1162 the load for each incoming message in an SMTP session. Otherwise, once one
1163 message is queued, the remainder are also.
1165 9. There is a new ACL, specified by acl_smtp_notquit, which is run in most
1166 cases when an SMTP session ends without sending QUIT. However, when Exim
1167 itself is is bad trouble, such as being unable to write to its log files,
1168 this ACL is not run, because it might try to do things (such as write to
1169 log files) that make the situation even worse.
1171 Like the QUIT ACL, this new ACL is provided to make it possible to gather
1172 statistics. Whatever it returns (accept or deny) is immaterial. The "delay"
1173 modifier is forbidden in this ACL.
1175 When the NOTQUIT ACL is running, the variable $smtp_notquit_reason is set
1176 to a string that indicates the reason for the termination of the SMTP
1177 connection. The possible values are:
1179 acl-drop Another ACL issued a "drop" command
1180 bad-commands Too many unknown or non-mail commands
1181 command-timeout Timeout while reading SMTP commands
1182 connection-lost The SMTP connection has been lost
1183 data-timeout Timeout while reading message data
1184 local-scan-error The local_scan() function crashed
1185 local-scan-timeout The local_scan() function timed out
1186 signal-exit SIGTERM or SIGINT
1187 synchronization-error SMTP synchronization error
1188 tls-failed TLS failed to start
1190 In most cases when an SMTP connection is closed without having received
1191 QUIT, Exim sends an SMTP response message before actually closing the
1192 connection. With the exception of acl-drop, the default message can be
1193 overridden by the "message" modifier in the NOTQUIT ACL. In the case of a
1194 "drop" verb in another ACL, it is the message from the other ACL that is
1197 10. For MySQL and PostgreSQL lookups, it is now possible to specify a list of
1198 servers with individual queries. This is done by starting the query with
1199 "servers=x:y:z;", where each item in the list may take one of two forms:
1201 (1) If it is just a host name, the appropriate global option (mysql_servers
1202 or pgsql_servers) is searched for a host of the same name, and the
1203 remaining parameters (database, user, password) are taken from there.
1205 (2) If it contains any slashes, it is taken as a complete parameter set.
1207 The list of servers is used in exactly the same was as the global list.
1208 Once a connection to a server has happened and a query has been
1209 successfully executed, processing of the lookup ceases.
1211 This feature is intended for use in master/slave situations where updates
1212 are occurring, and one wants to update a master rather than a slave. If the
1213 masters are in the list for reading, you might have:
1215 mysql_servers = slave1/db/name/pw:slave2/db/name/pw:master/db/name/pw
1217 In an updating lookup, you could then write
1219 ${lookup mysql{servers=master; UPDATE ...}
1221 If, on the other hand, the master is not to be used for reading lookups:
1223 pgsql_servers = slave1/db/name/pw:slave2/db/name/pw
1225 you can still update the master by
1227 ${lookup pgsql{servers=master/db/name/pw; UPDATE ...}
1229 11. The message_body_newlines option (default FALSE, for backwards
1230 compatibility) can be used to control whether newlines are present in
1231 $message_body and $message_body_end. If it is FALSE, they are replaced by
1238 1. There is a new log selector called smtp_no_mail, which is not included in
1239 the default setting. When it is set, a line is written to the main log
1240 whenever an accepted SMTP connection terminates without having issued a
1243 2. When an item in a dnslists list is followed by = and & and a list of IP
1244 addresses, the behaviour was not clear when the lookup returned more than
1245 one IP address. This has been solved by the addition of == and =& for "all"
1246 rather than the default "any" matching.
1248 3. Up till now, the only control over which cipher suites GnuTLS uses has been
1249 for the cipher algorithms. New options have been added to allow some of the
1250 other parameters to be varied.
1252 4. There is a new compile-time option called ENABLE_DISABLE_FSYNC. When it is
1253 set, Exim compiles a runtime option called disable_fsync.
1255 5. There is a new variable called $smtp_count_at_connection_start.
1257 6. There's a new control called no_pipelining.
1259 7. There are two new variables called $sending_ip_address and $sending_port.
1260 These are set whenever an SMTP connection to another host has been set up.
1262 8. The expansion of the helo_data option in the smtp transport now happens
1263 after the connection to the server has been made.
1265 9. There is a new expansion operator ${rfc2047d: that decodes strings that
1266 are encoded as per RFC 2047.
1268 10. There is a new log selector called "pid", which causes the current process
1269 id to be added to every log line, in square brackets, immediately after the
1272 11. Exim has been modified so that it flushes SMTP output before implementing
1273 a delay in an ACL. It also flushes the output before performing a callout,
1274 as this can take a substantial time. These behaviours can be disabled by
1275 obeying control = no_delay_flush or control = no_callout_flush,
1276 respectively, at some earlier stage of the connection.
1278 12. There are two new expansion conditions that iterate over a list. They are
1279 called forany and forall.
1281 13. There's a new global option called dsn_from that can be used to vary the
1282 contents of From: lines in bounces and other automatically generated
1283 messages ("delivery status notifications" - hence the name of the option).
1285 14. The smtp transport has a new option called hosts_avoid_pipelining.
1287 15. By default, exigrep does case-insensitive matches. There is now a -I option
1288 that makes it case-sensitive.
1290 16. A number of new features ("addresses", "map", "filter", and "reduce") have
1291 been added to string expansions to make it easier to process lists of
1292 items, typically addresses.
1294 17. There's a new ACL modifier called "continue". It does nothing of itself,
1295 and processing of the ACL always continues with the next condition or
1296 modifier. It is provided so that the side effects of expanding its argument
1299 18. It is now possible to use newline and other control characters (those with
1300 values less than 32, plus DEL) as separators in lists.
1302 19. The exigrep utility now has a -v option, which inverts the matching
1305 20. The host_find_failed option in the manualroute router can now be set to
1312 No new features were added to 4.66.
1318 No new features were added to 4.65.
1324 1. ACL variables can now be given arbitrary names, as long as they start with
1325 "acl_c" or "acl_m" (for connection variables and message variables), are at
1326 least six characters long, with the sixth character being either a digit or
1329 2. There is a new ACL modifier called log_reject_target. It makes it possible
1330 to specify which logs are used for messages about ACL rejections.
1332 3. There is a new authenticator called "dovecot". This is an interface to the
1333 authentication facility of the Dovecot POP/IMAP server, which can support a
1334 number of authentication methods.
1336 4. The variable $message_headers_raw provides a concatenation of all the
1337 messages's headers without any decoding. This is in contrast to
1338 $message_headers, which does RFC2047 decoding on the header contents.
1340 5. In a DNS black list, if two domain names, comma-separated, are given, the
1341 second is used first to do an initial check, making use of any IP value
1342 restrictions that are set. If there is a match, the first domain is used,
1343 without any IP value restrictions, to get the TXT record.
1345 6. All authenticators now have a server_condition option.
1347 7. There is a new command-line option called -Mset. It is useful only in
1348 conjunction with -be (that is, when testing string expansions). It must be
1349 followed by a message id; Exim loads the given message from its spool
1350 before doing the expansions.
1352 8. Another similar new command-line option is called -bem. It operates like
1353 -be except that it must be followed by the name of a file that contains a
1356 9. When an address is delayed because of a 4xx response to a RCPT command, it
1357 is now the combination of sender and recipient that is delayed in
1358 subsequent queue runs until its retry time is reached.
1360 10. Unary negation and the bitwise logical operators and, or, xor, not, and
1361 shift, have been added to the eval: and eval10: expansion items.
1363 11. The variables $interface_address and $interface_port have been renamed
1364 as $received_ip_address and $received_port, to make it clear that they
1365 relate to message reception rather than delivery. (The old names remain
1366 available for compatibility.)
1368 12. The "message" modifier can now be used on "accept" and "discard" acl verbs
1369 to vary the message that is sent when an SMTP command is accepted.
1375 1. There is a new Boolean option called filter_prepend_home for the redirect
1378 2. There is a new acl, set by acl_not_smtp_start, which is run right at the
1379 start of receiving a non-SMTP message, before any of the message has been
1382 3. When an SMTP error message is specified in a "message" modifier in an ACL,
1383 or in a :fail: or :defer: message in a redirect router, Exim now checks the
1384 start of the message for an SMTP error code.
1386 4. There is a new parameter for LDAP lookups called "referrals", which takes
1387 one of the settings "follow" (the default) or "nofollow".
1389 5. Version 20070721.2 of exipick now included, offering these new options:
1391 After all other sorting options have bee processed, reverse order
1392 before displaying messages (-R is synonym).
1394 Randomize order of matching messages before displaying.
1396 Instead of displaying the matching messages, display the sum
1398 --sort <variable>[,<variable>...]
1399 Before displaying matching messages, sort the messages according to
1400 each messages value for each variable.
1402 Negate the value for every test (returns inverse output from the
1403 same criteria without --not).
1409 1. The ${readsocket expansion item now supports Internet domain sockets as well
1410 as Unix domain sockets. If the first argument begins "inet:", it must be of
1411 the form "inet:host:port". The port is mandatory; it may be a number or the
1412 name of a TCP port in /etc/services. The host may be a name, or it may be an
1413 IP address. An ip address may optionally be enclosed in square brackets.
1414 This is best for IPv6 addresses. For example:
1416 ${readsocket{inet:[::1]:1234}{<request data>}...
1418 Only a single host name may be given, but if looking it up yield more than
1419 one IP address, they are each tried in turn until a connection is made. Once
1420 a connection has been made, the behaviour is as for ${readsocket with a Unix
1423 2. If a redirect router sets up file or pipe deliveries for more than one
1424 incoming address, and the relevant transport has batch_max set greater than
1425 one, a batch delivery now occurs.
1427 3. The appendfile transport has a new option called maildirfolder_create_regex.
1428 Its value is a regular expression. For a maildir delivery, this is matched
1429 against the maildir directory; if it matches, Exim ensures that a
1430 maildirfolder file is created alongside the new, cur, and tmp directories.
1436 The documentation is up-to-date for the 4.61 release. Major new features since
1437 the 4.60 release are:
1439 . An option called disable_ipv6, to disable the use of IPv6 completely.
1441 . An increase in the number of ACL variables to 20 of each type.
1443 . A change to use $auth1, $auth2, and $auth3 in authenticators instead of $1,
1444 $2, $3, (though those are still set) because the numeric variables get used
1445 for other things in complicated expansions.
1447 . The default for rfc1413_query_timeout has been changed from 30s to 5s.
1449 . It is possible to use setclassresources() on some BSD OS to control the
1450 resources used in pipe deliveries.
1452 . A new ACL modifier called add_header, which can be used with any verb.
1454 . More errors are detectable in retry rules.
1456 There are a number of other additions too.
1462 The documentation is up-to-date for the 4.60 release. Major new features since
1463 the 4.50 release are:
1465 . Support for SQLite.
1467 . Support for IGNOREQUOTA in LMTP.
1469 . Extensions to the "submission mode" features.
1471 . Support for Client SMTP Authorization (CSA).
1473 . Support for ratelimiting hosts and users.
1475 . New expansion items to help with the BATV "prvs" scheme.
1477 . A "match_ip" condition, that matches an IP address against a list.
1479 There are many more minor changes.