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.
14 2. An event on a failing SMTP AUTH, for both client and server operations.
16 3. Variable $sender_helo_verified with the result of an ACL "verify = helo".
18 4. Predefined macros for expansion items, operators, conditions and variables.
23 1. A new ACL condition: seen. Records/tests a timestamp against a key.
25 2. A variant of the "mask" expansion operator to give normalised IPv6.
27 3. UTC output option for exim_dumpdb, exim_fixdb.
29 4. An event for failing TLS connects to the daemon.
31 5. The ACL "debug" control gains options "stop", "pretrigger" and "trigger".
33 6. Query-style lookups are now checked for quoting, if the query string is
34 built using untrusted data ("tainted"). For now lack of quoting is merely
35 logged; a future release will upgrade this to an error.
37 7. The expansion conditions match_<list-type> and inlist now set $value for
38 the expansion of the "true" result of the ${if}. With a static list, this
39 can be used for de-tainting.
41 8. Recipient verify callouts now set $domain_data & $local_part_data, with
47 1. The fast-ramp two phase queue run support, previously experimental, is
48 now supported by default.
50 2. The native SRS support, previously experimental, is now supported. It is
51 not built unless specified in the Local/Makefile.
53 3. TLS resumption support, previously experimental, is now supported and
54 included in default builds.
56 4. Single-key LMDB lookups, previously experimental, are now supported.
57 The support is not built unless specified in the Local/Makefile.
59 5. Option "message_linelength_limit" on the smtp transport to enforce (by
60 default) the RFC 998 character limit.
62 6. An option to ignore the cache on a lookup.
64 7. Quota checking during reception (i.e. at SMTP time) for appendfile-
65 transport-managed quotas.
67 8. Sqlite lookups accept a "file=<path>" option to specify a per-operation
68 db file, replacing the previous prefix to the SQL string (which had
69 issues when the SQL used tainted values).
71 9. Lsearch lookups accept a "ret=full" option, to return both the portion
72 of the line matching the key, and the remainder.
74 10. A command-line option to have a daemon not create a notifier socket.
76 11. Faster TLS startup. When various configuration options contain no
77 expandable elements, the information can be preloaded and cached rather
78 than the previous behaviour of always loading at startup time for every
79 connection. This helps particularly for the CA bundle.
81 12. Proxy Protocol Timeout is configurable via "proxy_protocol_timeout"
84 13. Option "smtp_accept_max_per_connection" is now expanded.
86 14. Log selector "queue_time_exclusive", enabled by default, to exclude the
87 time taken for reception from QT log elements.
89 15. Main option "smtp_backlog_monitor", to set a level above which listen
90 socket backlogs are logged.
92 16. Main option "hosts_require_helo", requiring HELO or EHLO before MAIL.
94 17. A main config option "allow_insecure_tainted_data" allows to turn
96 18. TLS ALPN handling. By default, refuse TLS connections that try to specify
97 a non-smtp (eg. http) use. Options for customising.
99 19. Support for MacOS (darwin) has been dropped.
105 1. EXPERIMENTAL_SRS_NATIVE optional build feature. See the experimental.spec
108 2. Channel-binding for authenticators is now supported under OpenSSL.
109 Previously it was GnuTLS-only.
111 3. A msg:defer event.
113 4. Client-side support in the gsasl authenticator. Tested against the
114 plaintext driver for PLAIN; only against itself for SCRAM-SHA-1 and
115 SCRAM-SHA-1-PLUS methods.
117 5. Server-side support in the gsasl authenticator for encrypted passwords, as
118 an alternate for the existing plaintext.
120 6. Variable $local_part_data now also set by router check_local_user option,
121 with an de-tainted version of $local_part.
123 7. Named-list definitions can now be prefixed "hide" so that "-bP" commands do
124 not output the content. Previously this could only be done on options.
126 8. As an experimental feature, the dovecot authentication driver supports inet
127 sockets. Previously it was unix-domain sockets only.
129 9. The ACL control "queue_only" can also be spelled "queue", and now takes an
130 option "first_pass_route" to do the same as a "-odqs" on the command line.
132 10. Items specified for the router and transport headers_remove option can use
133 a trailing asterisk to specify globbing.
135 11. New $queue_size variable.
137 12. New variables $local_part_{pre,suf}fix_v.
139 13. New main option "sqlite_dbfile", for use in preference to prefixing the
140 lookup string. The older method fails when tainted variables are used
141 in the lookup, as the filename becomes tainted. The new method keeps the
144 14. Options on the dsearch lookup, to return the full path and to filter
145 filetypes for matching.
147 15. Options on pgsql and mysql lookups, to specify server separate from the
150 16. An option on all single-key lookups, to return (on a hit) a de-tainted
151 version of the lookup key rather than the looked-up data.
153 17. $domain_data and $local_part_data are now set by all list-match successes.
154 Previously only list items that performed lookups did so.
155 Also, matching list items that are tail-match or RE-match now set the
156 numeric variables $0 (etc) in the same way os other RE matches.
158 18. Expansion item ${listquote {<char} {<item>}}.
160 19. An option for the ${readsocket {}{}{}} expansion to make the result data
163 20. dkim_verify_min_keysizes, a list of minimum acceptable public-key sizes.
165 21. bounce_message_file and warn_message_file are now expanded before use.
167 22. New main config option spf_smtp_comment_template to customise the
168 $spf_smtp_comment variable
175 1. An "external" authenticator, per RFC 4422 Appendix A.
177 2. A JSON lookup type, and JSON variants of the forall/any expansion conditions.
179 3. Variables $tls_in_cipher_std, $tls_out_cipher_std giving the RFC names
182 4. Log_selectors "msg_id" (on by default) and "msg_id_created".
184 5. A case_insensitive option for verify=not_blind.
186 6. EXPERIMENTAL_TLS_RESUME optional build feature. See the experimental.spec
189 7. A main option exim_version to override the version Exim
190 reports in verious places ($exim_version, $version_number).
192 8. Expansion operator ${sha2_N:} for N=256, 384, 512.
194 9. Router variables, $r_... settable from router options and usable in routers
197 10. The spf lookup now supports IPv6.
199 11. Main options for DKIM verify to filter hash and key types.
201 12. With TLS1.3, support for full-chain OCSP stapling.
203 13. Dual-certificate stacks on servers now support OCSP stapling, under OpenSSL.
205 14: An smtp:ehlo transport event, for observability of the remote offered features.
207 15: Support under OpenSSL for writing NSS-style key files for packet-capture
208 decode. The environment variable SSLKEYLOGFILE is used; if an absolute path
209 it must indicate a file under the spool directory; if relative the the spool
210 directory is prepended. Works on the server side only. Support under
211 GnuTLS was already there, being done purely by the library (server side
212 only, and exim must be run as root).
214 16: Command-line option to move messages from one named queue to another.
216 17. Variables $tls_in_ver, $tls_out_ver.
222 1. ${l_header:<name>} and ${l_h:<name>} expansion items, giving a colon-sep
223 list when there are multiple headers having a given name. This matters
224 when individual headers are wrapped onto multiple lines; with previous
225 facilities hard to parse.
227 2. The ${readsocket } expansion item now takes a "tls" option, doing the
230 3. EXPERIMENTAL_REQUIRETLS and EXPERIMENTAL_PIPE_CONNECT optional build
231 features. See the experimental.spec file.
233 4. If built with SUPPORT_I18N a "utf8_downconvert" option on the smtp transport.
235 5. A "pipelining" log_selector.
237 6. Builtin macros for supported log_selector and openssl_options values.
239 7. JSON variants of the ${extract } expansion item.
241 8. A "noutf8" debug option, for disabling the UTF-8 characters in debug output.
243 9. TCP Fast Open support on MacOS.
248 1. Dual-certificate stacks on servers now support OCSP stapling, under GnuTLS
249 version 3.5.6 or later.
251 2. DANE is now supported under GnuTLS version 3.0.0 or later. Both GnuTLS and
252 OpenSSL versions are moved to mainline support from Experimental.
253 New SMTP transport option "dane_require_tls_ciphers".
255 3. Feature macros for the compiled-in set of malware scanner interfaces.
257 4. SPF support is promoted from Experimental to mainline status. The template
258 src/EDITME makefile does not enable its inclusion.
260 5. Logging control for DKIM verification. The existing DKIM log line is
261 controlled by a "dkim_verbose" selector which is _not_ enabled by default.
262 A new tag "DKIM=<domain>" is added to <= lines by default, controlled by
263 a "dkim" log_selector.
265 6. Receive duration on <= lines, under a new log_selector "receive_time".
267 7. Options "ipv4_only" and "ipv4_prefer" on the dnslookup router and on
268 routing rules in the manualroute router.
270 8. Expansion item ${sha3:<string>} / ${sha3_<N>:<string>} now also supported
271 under OpenSSL version 1.1.1 or later.
273 9. DKIM operations can now use the Ed25519 algorithm in addition to RSA, under
274 GnuTLS 3.6.0 or OpenSSL 1.1.1 or later.
276 10. Builtin feature-macros _CRYPTO_HASH_SHA3 and _CRYPTO_SIGN_ED25519, library
279 11. "exim -bP macro <name>" returns caller-usable status.
281 12. Expansion item ${authresults {<machine>}} for creating an
282 Authentication-Results: header.
284 13. EXPERIMENTAL_ARC. See the experimental.spec file.
285 See also new util/renew-opendmarc-tlds.sh script for use with DMARC/ARC.
287 14: A dane:fail event, intended to facilitate reporting.
289 15. "Lightweight" support for Redis Cluster. Requires redis_servers list to
290 contain all the servers in the cluster, all of which must be reachable from
291 the running exim instance. If the cluster has master/slave replication, the
292 list must contain all the master and slave servers.
294 16. Add an option to the Avast scanner interface: "pass_unscanned". This
295 allows to treat unscanned files as clean. Files may be unscanned for
296 several reasons: decompression bombs, broken archives.
302 1. PKG_CONFIG_PATH can now be set in Local/Makefile;
303 wildcards will be expanded, values are collapsed.
305 2. The ${readsocket } expansion now takes an option to not shutdown the
306 connection after sending the query string. The default remains to do so.
308 3. An smtp transport option "hosts_noproxy_tls" to control whether multiple
309 deliveries on a single TCP connection can maintain a TLS connection
310 open. By default disabled for all hosts, doing so saves the cost of
311 making new TLS sessions, at the cost of having to proxy the data via
312 another process. Logging is also affected.
314 4. A malware connection type for the FPSCAND protocol.
316 5. An option for recipient verify callouts to hold the connection open for
317 further recipients and for delivery.
319 6. The reproducible build $SOURCE_DATE_EPOCH environment variable is now
322 7. Optionally, an alternate format for spool data-files which matches the
323 wire format - meaning more efficient reception and transmission (at the
324 cost of difficulty with standard Unix tools). Only used for messages
325 received using the ESMTP CHUNKING option, and when a new main-section
326 option "spool_wireformat" (false by default) is set.
328 8. New main configuration option "commandline_checks_require_admin" to
329 restrict who can use various introspection options.
331 9. New option modifier "no_check" for quota and quota_filecount
332 appendfile transport.
334 10. Variable $smtp_command_history returning a comma-sep list of recent
337 11. Millisecond timetamps in logs, on log_selector "millisec". Also affects
338 log elements QT, DT and D, and timstamps in debug output.
340 12. TCP Fast Open logging. As a server, logs when the SMTP banner was sent
341 while still in SYN_RECV state; as a client logs when the connection
342 is opened with a TFO cookie.
344 13. DKIM support for multiple signing, by domain and/or key-selector.
345 DKIM support for multiple hashes, and for alternate-identity tags.
346 Builtin macro with default list of signed headers.
347 Better syntax for specifying oversigning.
348 The DKIM ACL can override verification status, and status is visible in
351 14. Exipick understands -C|--config for an alternative Exim
354 15. TCP Fast Open used, with data-on-SYN, for client SMTP via SOCKS5 proxy,
355 for ${readsocket } expansions, and for ClamAV.
357 16. The "-be" expansion test mode now supports macros. Macros are expanded
358 in test lines, and new macros can be defined.
360 17. Support for server-side dual-certificate-stacks (eg. RSA + ECDSA).
366 1. Allow relative config file names for ".include"
368 2. A main-section config option "debug_store" to control the checks on
369 variable locations during store-reset. Normally false but can be enabled
370 when a memory corruption issue is suspected on a production system.
376 1. The new perl_taintmode option allows to run the embedded perl
377 interpreter in taint mode.
379 2. New log_selector: dnssec, adds a "DS" tag to acceptance and delivery lines.
381 3. Speculative debugging, via a "kill" option to the "control=debug" ACL
384 4. New expansion item ${sha3:<string>} / ${sha3_<N>:<string>}.
385 N can be 224, 256 (default), 384, 512.
386 With GnuTLS 3.5.0 or later, only.
388 5. Facility for named queues: A command-line argument can specify
389 the queue name for a queue operation, and an ACL modifier can set
390 the queue to be used for a message. A $queue_name variable gives
393 6. New expansion operators base32/base32d.
395 7. The CHUNKING ESMTP extension from RFC 3030. May give some slight
396 performance increase and network load decrease. Main config option
397 chunking_advertise_hosts, and smtp transport option hosts_try_chunking
400 8. LMDB lookup support, as Experimental. Patch supplied by Andrew Colin Kissa.
402 9. Expansion operator escape8bit, like escape but not touching newline etc..
404 10. Feature macros, generated from compile options. All start with "_HAVE_"
405 and go on with some roughly recognisable name. Driver macros, for
406 router, transport and authentication drivers; names starting with "_DRIVER_".
407 Option macros, for each configuration-file option; all start with "_OPT_".
408 Use the "-bP macros" command-line option to see what is present.
410 11. Integer values for options can take a "G" multiplier.
412 12. defer=pass option for the ACL control cutthrough_delivery, to reflect 4xx
413 returns from the target back to the initiator, rather than spooling the
416 13. New built-in constants available for tls_dhparam and default changed.
418 14. If built with EXPERIMENTAL_QUEUEFILE, a queuefile transport, for writing
419 out copies of the message spool files for use by 3rd-party scanners.
421 15. A new option on the smtp transport, hosts_try_fastopen. If the system
422 supports it (on Linux it must be enabled in the kernel by the sysadmin)
423 try to use RFC 7413 "TCP Fast Open". No data is sent on the SYN segment
424 but it permits a peer that also supports the facility to send its SMTP
425 banner immediately after the SYN,ACK segment rather then waiting for
426 another ACK - so saving up to one roundtrip time. Because it requires
427 previous communication with the peer (we save a cookie from it) this
428 will only become active on frequently-contacted destinations.
430 16. A new syslog_pid option to suppress PID duplication in syslog lines.
436 1. The ACL conditions regex and mime_regex now capture substrings
437 into numeric variables $regex1 to 9, like the "match" expansion condition.
439 2. New $callout_address variable records the address used for a spam=,
440 malware= or verify= callout.
442 3. Transports now take a "max_parallel" option, to limit concurrency.
444 4. Expansion operators ${ipv6norm:<string>} and ${ipv6denorm:<string>}.
445 The latter expands to a 8-element colon-sep set of hex digits including
446 leading zeroes. A trailing ipv4-style dotted-decimal set is converted
447 to hex. Pure ipv4 addresses are converted to IPv4-mapped IPv6.
448 The former operator strips leading zeroes and collapses the longest
449 set of 0-groups to a double-colon.
451 5. New "-bP config" support, to dump the effective configuration.
453 6. New $dkim_key_length variable.
455 7. New base64d and base64 expansion items (the existing str2b64 being a
456 synonym of the latter). Add support in base64 for certificates.
458 8. New main configuration option "bounce_return_linesize_limit" to
459 avoid oversize bodies in bounces. The default value matches RFC
462 9. New $initial_cwd expansion variable.
468 1. Support for using the system standard CA bundle.
470 2. New expansion items $config_file, $config_dir, containing the file
471 and directory name of the main configuration file. Also $exim_version.
473 3. New "malware=" support for Avast.
475 4. New "spam=" variant option for Rspamd.
477 5. Assorted options on malware= and spam= scanners.
479 6. A command-line option to write a comment into the logfile.
481 7. If built with EXPERIMENTAL_SOCKS feature enabled, the smtp transport can
482 be configured to make connections via socks5 proxies.
484 8. If built with EXPERIMENTAL_INTERNATIONAL, support is included for
485 the transmission of UTF-8 envelope addresses.
487 9. If built with EXPERIMENTAL_INTERNATIONAL, an expansion item for a commonly
488 used encoding of Maildir folder names.
490 10. A logging option for slow DNS lookups.
492 11. New ${env {<variable>}} expansion.
494 12. A non-SMTP authenticator using information from TLS client certificates.
496 13. Main option "tls_eccurve" for selecting an Elliptic Curve for TLS.
497 Patch originally by Wolfgang Breyha.
499 14. Main option "dns_trust_aa" for trusting your local nameserver at the
500 same level as DNSSEC.
505 1. If built with EXPERIMENTAL_DANE feature enabled, Exim will follow the
506 DANE SMTP draft to assess a secure chain of trust of the certificate
507 used to establish the TLS connection based on a TLSA record in the
508 domain of the sender.
510 2. The EXPERIMENTAL_TPDA feature has been renamed to EXPERIMENTAL_EVENT
511 and several new events have been created. The reason is because it has
512 been expanded beyond just firing events during the transport phase. Any
513 existing TPDA transport options will have to be rewritten to use a new
514 $event_name expansion variable in a condition. Refer to the
515 experimental-spec.txt for details and examples.
517 3. The EXPERIMENTAL_CERTNAMES features is an enhancement to verify that
518 server certs used for TLS match the result of the MX lookup. It does
519 not use the same mechanism as DANE.
529 1. If built with the EXPERIMENTAL_PROXY feature enabled, Exim can be
530 configured to expect an initial header from a proxy that will make the
531 actual external source IP:host be used in exim instead of the IP of the
532 proxy that is connecting to it.
534 2. New verify option header_names_ascii, which will check to make sure
535 there are no non-ASCII characters in header names. Exim itself handles
536 those non-ASCII characters, but downstream apps may not, so Exim can
537 detect and reject if those characters are present.
539 3. New expansion operator ${utf8clean:string} to replace malformed UTF8
540 codepoints with valid ones.
542 4. New malware type "sock". Talks over a Unix or TCP socket, sending one
543 command line and matching a regex against the return data for trigger
544 and a second regex to extract malware_name. The mail spoolfile name can
545 be included in the command line.
547 5. The smtp transport now supports options "tls_verify_hosts" and
548 "tls_try_verify_hosts". If either is set the certificate verification
549 is split from the encryption operation. The default remains that a failed
550 verification cancels the encryption.
552 6. New SERVERS override of default ldap server list. In the ACLs, an ldap
553 lookup can now set a list of servers to use that is different from the
556 7. New command-line option -C for exiqgrep to specify alternate exim.conf
557 file when searching the queue.
559 8. OCSP now supports GnuTLS also, if you have version 3.1.3 or later of that.
561 9. Support for DNSSEC on outbound connections.
563 10. New variables "tls_(in,out)_(our,peer)cert" and expansion item
564 "certextract" to extract fields from them. Hash operators md5 and sha1
565 work over them for generating fingerprints, and a new sha256 operator
568 11. PRDR is now supported dy default.
570 12. OCSP stapling is now supported by default.
572 13. If built with the EXPERIMENTAL_DSN feature enabled, Exim will output
573 Delivery Status Notification messages in MIME format, and negotiate
574 DSN features per RFC 3461.
580 1. New command-line option -bI:sieve will list all supported sieve extensions
581 of this Exim build on standard output, one per line.
582 ManageSieve (RFC 5804) providers managing scripts for use by Exim should
583 query this to establish the correct list to include in the protocol's
584 SIEVE capability line.
586 2. If the -n option is combined with the -bP option, then the name of an
587 emitted option is not output, only the value (if visible to you).
588 For instance, "exim -n -bP pid_file_path" should just emit a pathname
589 followed by a newline, and no other text.
591 3. When built with SUPPORT_TLS and USE_GNUTLS, the SMTP transport driver now
592 has a "tls_dh_min_bits" option, to set the minimum acceptable number of
593 bits in the Diffie-Hellman prime offered by a server (in DH ciphersuites)
594 acceptable for security. (Option accepted but ignored if using OpenSSL).
595 Defaults to 1024, the old value. May be lowered only to 512, or raised as
596 far as you like. Raising this may hinder TLS interoperability with other
597 sites and is not currently recommended. Lowering this will permit you to
598 establish a TLS session which is not as secure as you might like.
600 Unless you really know what you are doing, leave it alone.
602 4. If not built with DISABLE_DNSSEC, Exim now has the main option
603 dns_dnssec_ok; if set to 1 then Exim will initialise the resolver library
604 to send the DO flag to your recursive resolver. If you have a recursive
605 resolver, which can set the Authenticated Data (AD) flag in results, Exim
606 can now detect this. Exim does not perform validation itself, instead
607 relying upon a trusted path to the resolver.
609 Current status: work-in-progress; $sender_host_dnssec variable added.
611 5. DSCP support for outbound connections: on a transport using the smtp driver,
612 set "dscp = ef", for instance, to cause the connections to have the relevant
613 DSCP (IPv4 TOS or IPv6 TCLASS) value in the header.
615 Similarly for inbound connections, there is a new control modifier, dscp,
616 so "warn control = dscp/ef" in the connect ACL, or after authentication.
618 Supported values depend upon system libraries. "exim -bI:dscp" to list the
619 ones Exim knows of. You can also set a raw number 0..0x3F.
621 6. The -G command-line flag is no longer ignored; it is now equivalent to an
622 ACL setting "control = suppress_local_fixups". The -L command-line flag
623 is now accepted and forces use of syslog, with the provided tag as the
624 process name. A few other flags used by Sendmail are now accepted and
627 7. New cutthrough routing feature. Requested by a "control = cutthrough_delivery"
628 ACL modifier; works for single-recipient mails which are received on and
629 deliverable via SMTP. Using the connection made for a recipient verify,
630 if requested before the verify, or a new one made for the purpose while
631 the inbound connection is still active. The bulk of the mail item is copied
632 direct from the inbound socket to the outbound (as well as the spool file).
633 When the source notifies the end of data, the data acceptance by the destination
634 is negotiated before the acceptance is sent to the source. If the destination
635 does not accept the mail item, for example due to content-scanning, the item
636 is not accepted from the source and therefore there is no need to generate
637 a bounce mail. This is of benefit when providing a secondary-MX service.
638 The downside is that delays are under the control of the ultimate destination
641 The Received-by: header on items delivered by cutthrough is generated
642 early in reception rather than at the end; this will affect any timestamp
643 included. The log line showing delivery is recorded before that showing
644 reception; it uses a new ">>" tag instead of "=>".
646 To support the feature, verify-callout connections can now use ESMTP and TLS.
647 The usual smtp transport options are honoured, plus a (new, default everything)
648 hosts_verify_avoid_tls.
650 New variable families named tls_in_cipher, tls_out_cipher etc. are introduced
651 for specific access to the information for each connection. The old names
652 are present for now but deprecated.
654 Not yet supported: IGNOREQUOTA, SIZE, PIPELINING.
656 8. New expansion operators ${listnamed:name} to get the content of a named list
657 and ${listcount:string} to count the items in a list.
659 9. New global option "gnutls_allow_auto_pkcs11", defaults false. The GnuTLS
660 rewrite in 4.80 combines with GnuTLS 2.12.0 or later, to autoload PKCS11
661 modules. For some situations this is desirable, but we expect admin in
662 those situations to know they want the feature. More commonly, it means
663 that GUI user modules get loaded and are broken by the setuid Exim being
664 unable to access files specified in environment variables and passed
665 through, thus breakage. So we explicitly inhibit the PKCS11 initialisation
666 unless this new option is set.
668 Some older OS's with earlier versions of GnuTLS might not have pkcs11 ability,
669 so have also added a build option which can be used to build Exim with GnuTLS
670 but without trying to use any kind of PKCS11 support. Uncomment this in the
673 AVOID_GNUTLS_PKCS11=yes
675 10. The "acl = name" condition on an ACL now supports optional arguments.
676 New expansion item "${acl {name}{arg}...}" and expansion condition
677 "acl {{name}{arg}...}" are added. In all cases up to nine arguments
678 can be used, appearing in $acl_arg1 to $acl_arg9 for the called ACL.
679 Variable $acl_narg contains the number of arguments. If the ACL sets
680 a "message =" value this becomes the result of the expansion item,
681 or the value of $value for the expansion condition. If the ACL returns
682 accept the expansion condition is true; if reject, false. A defer
683 return results in a forced fail.
685 11. Routers and transports can now have multiple headers_add and headers_remove
686 option lines. The concatenated list is used.
688 12. New ACL modifier "remove_header" can remove headers before message gets
689 handled by routers/transports.
691 13. New dnsdb lookup pseudo-type "a+". A sequence of "a6" (if configured),
692 "aaaa" and "a" lookups is done and the full set of results returned.
694 14. New expansion variable $headers_added with content from ACL add_header
695 modifier (but not yet added to message).
697 15. New 8bitmime status logging option for received messages. Log field "M8S".
699 16. New authenticated_sender logging option, adding to log field "A".
701 17. New expansion variables $router_name and $transport_name. Useful
702 particularly for debug_print as -bt command-line option does not
703 require privilege whereas -d does.
705 18. If built with EXPERIMENTAL_PRDR, per-recipient data responses per a
706 proposed extension to SMTP from Eric Hall.
708 19. The pipe transport has gained the force_command option, to allow
709 decorating commands from user .forward pipe aliases with prefix
710 wrappers, for instance.
712 20. Callout connections can now AUTH; the same controls as normal delivery
715 21. Support for DMARC, using opendmarc libs, can be enabled. It adds new
716 options: dmarc_forensic_sender, dmarc_history_file, and dmarc_tld_file.
717 It adds new expansion variables $dmarc_ar_header, $dmarc_status,
718 $dmarc_status_text, and $dmarc_used_domain. It adds a new acl modifier
719 dmarc_status. It adds new control flags dmarc_disable_verify and
720 dmarc_enable_forensic. The default for the dmarc_tld_file option is
721 "/etc/exim/opendmarc.tlds" and can be changed via EDITME.
723 22. Add expansion variable $authenticated_fail_id, which is the username
724 provided to the authentication method which failed. It is available
725 for use in subsequent ACL processing (typically quit or notquit ACLs).
727 23. New ACL modifier "udpsend" can construct a UDP packet to send to a given
730 24. New ${hexquote:..string..} expansion operator converts non-printable
731 characters in the string to \xNN form.
733 25. Experimental TPDA (Transport Post Delivery Action) function added.
734 Patch provided by Axel Rau.
736 26. Experimental Redis lookup added. Patch provided by Warren Baker.
742 1. New authenticator driver, "gsasl". Server-only (at present).
743 This is a SASL interface, licensed under GPL, which can be found at
744 http://www.gnu.org/software/gsasl/.
745 This system does not provide sources of data for authentication, so
746 careful use needs to be made of the conditions in Exim.
748 2. New authenticator driver, "heimdal_gssapi". Server-only.
749 A replacement for using cyrus_sasl with Heimdal, now that $KRB5_KTNAME
750 is no longer honoured for setuid programs by Heimdal. Use the
751 "server_keytab" option to point to the keytab.
753 3. The "pkg-config" system can now be used when building Exim to reference
754 cflags and library information for lookups and authenticators, rather
755 than having to update "CFLAGS", "AUTH_LIBS", "LOOKUP_INCLUDE" and
756 "LOOKUP_LIBS" directly. Similarly for handling the TLS library support
757 without adjusting "TLS_INCLUDE" and "TLS_LIBS".
759 In addition, setting PCRE_CONFIG=yes will query the pcre-config tool to
760 find the headers and libraries for PCRE.
762 4. New expansion variable $tls_bits.
764 5. New lookup type, "dbmjz". Key is an Exim list, the elements of which will
765 be joined together with ASCII NUL characters to construct the key to pass
766 into the DBM library. Can be used with gsasl to access sasldb2 files as
769 6. OpenSSL now supports TLS1.1 and TLS1.2 with OpenSSL 1.0.1.
771 Avoid release 1.0.1a if you can. Note that the default value of
772 "openssl_options" is no longer "+dont_insert_empty_fragments", as that
773 increased susceptibility to attack. This may still have interoperability
774 implications for very old clients (see version 4.31 change 37) but
775 administrators can choose to make the trade-off themselves and restore
776 compatibility at the cost of session security.
778 7. Use of the new expansion variable $tls_sni in the main configuration option
779 tls_certificate will cause Exim to re-expand the option, if the client
780 sends the TLS Server Name Indication extension, to permit choosing a
781 different certificate; tls_privatekey will also be re-expanded. You must
782 still set these options to expand to valid files when $tls_sni is not set.
784 The SMTP Transport has gained the option tls_sni, which will set a hostname
785 for outbound TLS sessions, and set $tls_sni too.
787 A new log_selector, +tls_sni, has been added, to log received SNI values
788 for Exim as a server.
790 8. The existing "accept_8bitmime" option now defaults to true. This means
791 that Exim is deliberately not strictly RFC compliant. We're following
792 Dan Bernstein's advice in http://cr.yp.to/smtp/8bitmime.html by default.
793 Those who disagree, or know that they are talking to mail servers that,
794 even today, are not 8-bit clean, need to turn off this option.
796 9. Exim can now be started with -bw (with an optional timeout, given as
797 -bw<timespec>). With this, stdin at startup is a socket that is
798 already listening for connections. This has a more modern name of
799 "socket activation", but forcing the activated socket to fd 0. We're
800 interested in adding more support for modern variants.
802 10. ${eval } now uses 64-bit values on supporting platforms. A new "G" suffix
803 for numbers indicates multiplication by 1024^3.
805 11. The GnuTLS support has been revamped; the three options gnutls_require_kx,
806 gnutls_require_mac & gnutls_require_protocols are no longer supported.
807 tls_require_ciphers is now parsed by gnutls_priority_init(3) as a priority
808 string, documentation for which is at:
809 http://www.gnutls.org/manual/html_node/Priority-Strings.html
811 SNI support has been added to Exim's GnuTLS integration too.
813 For sufficiently recent GnuTLS libraries, ${randint:..} will now use
814 gnutls_rnd(), asking for GNUTLS_RND_NONCE level randomness.
816 12. With OpenSSL, if built with EXPERIMENTAL_OCSP, a new option tls_ocsp_file
817 is now available. If the contents of the file are valid, then Exim will
818 send that back in response to a TLS status request; this is OCSP Stapling.
819 Exim will not maintain the contents of the file in any way: administrators
820 are responsible for ensuring that it is up-to-date.
822 See "experimental-spec.txt" for more details.
824 13. ${lookup dnsdb{ }} supports now SPF record types. They are handled
825 identically to TXT record lookups.
827 14. New expansion variable $tod_epoch_l for higher-precision time.
829 15. New global option tls_dh_max_bits, defaulting to current value of NSS
830 hard-coded limit of DH ephemeral bits, to fix interop problems caused by
831 GnuTLS 2.12 library recommending a bit count higher than NSS supports.
833 16. tls_dhparam now used by both OpenSSL and GnuTLS, can be path or identifier.
834 Option can now be a path or an identifier for a standard prime.
835 If unset, we use the DH prime from section 2.2 of RFC 5114, "ike23".
836 Set to "historic" to get the old GnuTLS behaviour of auto-generated DH
839 17. SSLv2 now disabled by default in OpenSSL. (Never supported by GnuTLS).
840 Use "openssl_options -no_sslv2" to re-enable support, if your OpenSSL
841 install was not built with OPENSSL_NO_SSL2 ("no-ssl2").
847 1. New options for the ratelimit ACL condition: /count= and /unique=.
848 The /noupdate option has been replaced by a /readonly option.
850 2. The SMTP transport's protocol option may now be set to "smtps", to
851 use SSL-on-connect outbound.
853 3. New variable $av_failed, set true if the AV scanner deferred; ie, when
854 there is a problem talking to the AV scanner, or the AV scanner running.
856 4. New expansion conditions, "inlist" and "inlisti", which take simple lists
857 and check if the search item is a member of the list. This does not
858 support named lists, but does subject the list part to string expansion.
860 5. Unless the new EXPAND_LISTMATCH_RHS build option is set when Exim was
861 built, Exim no longer performs string expansion on the second string of
862 the match_* expansion conditions: "match_address", "match_domain",
863 "match_ip" & "match_local_part". Named lists can still be used.
869 1. The global option "dns_use_edns0" may be set to coerce EDNS0 usage on
870 or off in the resolver library.
876 1. In addition to the existing LDAP and LDAP/SSL ("ldaps") support, there
877 is now LDAP/TLS support, given sufficiently modern OpenLDAP client
878 libraries. The following global options have been added in support of
879 this: ldap_ca_cert_dir, ldap_ca_cert_file, ldap_cert_file, ldap_cert_key,
880 ldap_cipher_suite, ldap_require_cert, ldap_start_tls.
882 2. The pipe transport now takes a boolean option, "freeze_signal", default
883 false. When true, if the external delivery command exits on a signal then
884 Exim will freeze the message in the queue, instead of generating a bounce.
886 3. Log filenames may now use %M as an escape, instead of %D (still available).
887 The %M pattern expands to yyyymm, providing month-level resolution.
889 4. The $message_linecount variable is now updated for the maildir_tag option,
890 in the same way as $message_size, to reflect the real number of lines,
891 including any header additions or removals from transport.
893 5. When contacting a pool of SpamAssassin servers configured in spamd_address,
894 Exim now selects entries randomly, to better scale in a cluster setup.
900 1. SECURITY FIX: privilege escalation flaw fixed. On Linux (and only Linux)
901 the flaw permitted the Exim run-time user to cause root to append to
902 arbitrary files of the attacker's choosing, with the content based
903 on content supplied by the attacker.
905 2. Exim now supports loading some lookup types at run-time, using your
906 platform's dlopen() functionality. This has limited platform support
907 and the intention is not to support every variant, it's limited to
908 dlopen(). This permits the main Exim binary to not be linked against
909 all the libraries needed for all the lookup types.
915 NOTE: this version is not guaranteed backwards-compatible, please read the
916 items below carefully
918 1. A new main configuration option, "openssl_options", is available if Exim
919 is built with SSL support provided by OpenSSL. The option allows
920 administrators to specify OpenSSL options to be used on connections;
921 typically this is to set bug compatibility features which the OpenSSL
922 developers have not enabled by default. There may be security
923 consequences for certain options, so these should not be changed
926 2. A new pipe transport option, "permit_coredumps", may help with problem
927 diagnosis in some scenarios. Note that Exim is typically installed as
928 a setuid binary, which on most OSes will inhibit coredumps by default,
929 so that safety mechanism would have to be overridden for this option to
930 be able to take effect.
932 3. ClamAV 0.95 is now required for ClamAV support in Exim, unless
933 Local/Makefile sets: WITH_OLD_CLAMAV_STREAM=yes
934 Note that this switches Exim to use a new API ("INSTREAM") and a future
935 release of ClamAV will remove support for the old API ("STREAM").
937 The av_scanner option, when set to "clamd", now takes an optional third
938 part, "local", which causes Exim to pass a filename to ClamAV instead of
939 the file content. This is the same behaviour as when clamd is pointed at
940 a Unix-domain socket. For example:
942 av_scanner = clamd:192.0.2.3 1234:local
944 ClamAV's ExtendedDetectionInfo response format is now handled.
946 4. There is now a -bmalware option, restricted to admin users. This option
947 takes one parameter, a filename, and scans that file with Exim's
948 malware-scanning framework. This is intended purely as a debugging aid
949 to ensure that Exim's scanning is working, not to replace other tools.
950 Note that the ACL framework is not invoked, so if av_scanner references
951 ACL variables without a fallback then this will fail.
953 5. There is a new expansion operator, "reverse_ip", which will reverse IP
954 addresses; IPv4 into dotted quad, IPv6 into dotted nibble. Examples:
956 ${reverse_ip:192.0.2.4}
958 ${reverse_ip:2001:0db8:c42:9:1:abcd:192.0.2.3}
959 -> 3.0.2.0.0.0.0.c.d.c.b.a.1.0.0.0.9.0.0.0.2.4.c.0.8.b.d.0.1.0.0.2
961 6. There is a new ACL control called "debug", to enable debug logging.
962 This allows selective logging of certain incoming transactions within
963 production environments, with some care. It takes two options, "tag"
964 and "opts"; "tag" is included in the filename of the log and "opts"
965 is used as per the -d<options> command-line option. Examples, which
966 don't all make sense in all contexts:
969 control = debug/tag=.$sender_host_address
970 control = debug/opts=+expand+acl
971 control = debug/tag=.$message_exim_id/opts=+expand
973 7. It has always been implicit in the design and the documentation that
974 "the Exim user" is not root. src/EDITME said that using root was
975 "very strongly discouraged". This is not enough to keep people from
976 shooting themselves in the foot in days when many don't configure Exim
977 themselves but via package build managers. The security consequences of
978 running various bits of network code are severe if there should be bugs in
979 them. As such, the Exim user may no longer be root. If configured
980 statically, Exim will refuse to build. If configured as ref:user then Exim
981 will exit shortly after start-up. If you must shoot yourself in the foot,
982 then henceforth you will have to maintain your own local patches to strip
985 8. There is a new expansion condition, bool_lax{}. Where bool{} uses the ACL
986 condition logic to determine truth/failure and will fail to expand many
987 strings, bool_lax{} uses the router condition logic, where most strings
989 Note: bool{00} is false, bool_lax{00} is true.
991 9. Routers now support multiple "condition" tests.
993 10. There is now a runtime configuration option "tcp_wrappers_daemon_name".
994 Setting this allows an admin to define which entry in the tcpwrappers
995 config file will be used to control access to the daemon. This option
996 is only available when Exim is built with USE_TCP_WRAPPERS. The
997 default value is set at build time using the TCP_WRAPPERS_DAEMON_NAME
1000 11. [POSSIBLE CONFIG BREAKAGE] The default value for system_filter_user is now
1001 the Exim run-time user, instead of root.
1003 12. [POSSIBLE CONFIG BREAKAGE] ALT_CONFIG_ROOT_ONLY is no longer optional and
1004 is forced on. This is mitigated by the new build option
1005 TRUSTED_CONFIG_LIST which defines a list of configuration files which
1006 are trusted; one per line. If a config file is owned by root and matches
1007 a pathname in the list, then it may be invoked by the Exim build-time
1008 user without Exim relinquishing root privileges.
1010 13. [POSSIBLE CONFIG BREAKAGE] The Exim user is no longer automatically
1011 trusted to supply -D<Macro[=Value]> overrides on the command-line. Going
1012 forward, we recommend using TRUSTED_CONFIG_LIST with shim configs that
1013 include the main config. As a transition mechanism, we are temporarily
1014 providing a work-around: the new build option WHITELIST_D_MACROS provides
1015 a colon-separated list of macro names which may be overridden by the Exim
1016 run-time user. The values of these macros are constrained to the regex
1017 ^[A-Za-z0-9_/.-]*$ (which explicitly does allow for empty values).
1023 1. TWO SECURITY FIXES: one relating to mail-spools which are globally
1024 writable, the other to locking of MBX folders (not mbox).
1026 2. MySQL stored procedures are now supported.
1028 3. The dkim_domain transport option is now a list, not a single string, and
1029 messages will be signed for each element in the list (discarding
1032 4. The 4.70 release unexpectedly changed the behaviour of dnsdb TXT lookups
1033 in the presence of multiple character strings within the RR. Prior to 4.70,
1034 only the first string would be returned. The dnsdb lookup now, by default,
1035 preserves the pre-4.70 semantics, but also now takes an extended output
1036 separator specification. The separator can be followed by a semicolon, to
1037 concatenate the individual text strings together with no join character,
1038 or by a comma and a second separator character, in which case the text
1039 strings within a TXT record are joined on that second character.
1040 Administrators are reminded that DNS provides no ordering guarantees
1041 between multiple records in an RRset. For example:
1043 foo.example. IN TXT "a" "b" "c"
1044 foo.example. IN TXT "d" "e" "f"
1046 ${lookup dnsdb{>/ txt=foo.example}} -> "a/d"
1047 ${lookup dnsdb{>/; txt=foo.example}} -> "def/abc"
1048 ${lookup dnsdb{>/,+ txt=foo.example}} -> "a+b+c/d+e+f"
1054 1. Native DKIM support without an external library.
1055 (Note that if no action to prevent it is taken, a straight upgrade will
1056 result in DKIM verification of all signed incoming emails. See spec
1057 for details on conditionally disabling)
1059 2. Experimental DCC support via dccifd (contributed by Wolfgang Breyha).
1061 3. There is now a bool{} expansion condition which maps certain strings to
1062 true/false condition values (most likely of use in conjunction with the
1063 and{} expansion operator).
1065 4. The $spam_score, $spam_bar and $spam_report variables are now available
1068 5. exim -bP now supports "macros", "macro_list" or "macro MACRO_NAME" as
1069 options, provided that Exim is invoked by an admin_user.
1071 6. There is a new option gnutls_compat_mode, when linked against GnuTLS,
1072 which increases compatibility with older clients at the cost of decreased
1073 security. Don't set this unless you need to support such clients.
1075 7. There is a new expansion operator, ${randint:...} which will produce a
1076 "random" number less than the supplied integer. This randomness is
1077 not guaranteed to be cryptographically strong, but depending upon how
1078 Exim was built may be better than the most naive schemes.
1080 8. Exim now explicitly ensures that SHA256 is available when linked against
1083 9. The transport_filter_timeout option now applies to SMTP transports too.
1089 1. Preliminary DKIM support in Experimental.
1095 1. The body_linecount and body_zerocount C variables are now exported in the
1098 2. When a dnslists lookup succeeds, the key that was looked up is now placed
1099 in $dnslist_matched. When the key is an IP address, it is not reversed in
1100 this variable (though it is, of course, in the actual lookup). In simple
1103 deny dnslists = spamhaus.example
1105 the key is also available in another variable (in this case,
1106 $sender_host_address). In more complicated cases, however, this is not
1107 true. For example, using a data lookup might generate a dnslists lookup
1110 deny dnslists = spamhaus.example/<|192.168.1.2|192.168.6.7|...
1112 If this condition succeeds, the value in $dnslist_matched might be
1113 192.168.6.7 (for example).
1115 3. Authenticators now have a client_condition option. When Exim is running as
1116 a client, it skips an authenticator whose client_condition expansion yields
1117 "0", "no", or "false". This can be used, for example, to skip plain text
1118 authenticators when the connection is not encrypted by a setting such as:
1120 client_condition = ${if !eq{$tls_cipher}{}}
1122 Note that the 4.67 documentation states that $tls_cipher contains the
1123 cipher used for incoming messages. In fact, during SMTP delivery, it
1124 contains the cipher used for the delivery. The same is true for
1127 4. There is now a -Mvc <message-id> option, which outputs a copy of the
1128 message to the standard output, in RFC 2822 format. The option can be used
1129 only by an admin user.
1131 5. There is now a /noupdate option for the ratelimit ACL condition. It
1132 computes the rate and checks the limit as normal, but it does not update
1133 the saved data. This means that, in relevant ACLs, it is possible to lookup
1134 the existence of a specified (or auto-generated) ratelimit key without
1135 incrementing the ratelimit counter for that key.
1137 In order for this to be useful, another ACL entry must set the rate
1138 for the same key somewhere (otherwise it will always be zero).
1143 # Read the rate; if it doesn't exist or is below the maximum
1144 # we update it below
1145 deny ratelimit = 100 / 5m / strict / noupdate
1146 log_message = RATE: $sender_rate / $sender_rate_period \
1147 (max $sender_rate_limit)
1149 [... some other logic and tests...]
1151 warn ratelimit = 100 / 5m / strict / per_cmd
1152 log_message = RATE UPDATE: $sender_rate / $sender_rate_period \
1153 (max $sender_rate_limit)
1154 condition = ${if le{$sender_rate}{$sender_rate_limit}}
1158 6. The variable $max_received_linelength contains the number of bytes in the
1159 longest line that was received as part of the message, not counting the
1160 line termination character(s).
1162 7. Host lists can now include +ignore_defer and +include_defer, analogous to
1163 +ignore_unknown and +include_unknown. These options should be used with
1164 care, probably only in non-critical host lists such as whitelists.
1166 8. There's a new option called queue_only_load_latch, which defaults true.
1167 If set false when queue_only_load is greater than zero, Exim re-evaluates
1168 the load for each incoming message in an SMTP session. Otherwise, once one
1169 message is queued, the remainder are also.
1171 9. There is a new ACL, specified by acl_smtp_notquit, which is run in most
1172 cases when an SMTP session ends without sending QUIT. However, when Exim
1173 itself is is bad trouble, such as being unable to write to its log files,
1174 this ACL is not run, because it might try to do things (such as write to
1175 log files) that make the situation even worse.
1177 Like the QUIT ACL, this new ACL is provided to make it possible to gather
1178 statistics. Whatever it returns (accept or deny) is immaterial. The "delay"
1179 modifier is forbidden in this ACL.
1181 When the NOTQUIT ACL is running, the variable $smtp_notquit_reason is set
1182 to a string that indicates the reason for the termination of the SMTP
1183 connection. The possible values are:
1185 acl-drop Another ACL issued a "drop" command
1186 bad-commands Too many unknown or non-mail commands
1187 command-timeout Timeout while reading SMTP commands
1188 connection-lost The SMTP connection has been lost
1189 data-timeout Timeout while reading message data
1190 local-scan-error The local_scan() function crashed
1191 local-scan-timeout The local_scan() function timed out
1192 signal-exit SIGTERM or SIGINT
1193 synchronization-error SMTP synchronization error
1194 tls-failed TLS failed to start
1196 In most cases when an SMTP connection is closed without having received
1197 QUIT, Exim sends an SMTP response message before actually closing the
1198 connection. With the exception of acl-drop, the default message can be
1199 overridden by the "message" modifier in the NOTQUIT ACL. In the case of a
1200 "drop" verb in another ACL, it is the message from the other ACL that is
1203 10. For MySQL and PostgreSQL lookups, it is now possible to specify a list of
1204 servers with individual queries. This is done by starting the query with
1205 "servers=x:y:z;", where each item in the list may take one of two forms:
1207 (1) If it is just a host name, the appropriate global option (mysql_servers
1208 or pgsql_servers) is searched for a host of the same name, and the
1209 remaining parameters (database, user, password) are taken from there.
1211 (2) If it contains any slashes, it is taken as a complete parameter set.
1213 The list of servers is used in exactly the same was as the global list.
1214 Once a connection to a server has happened and a query has been
1215 successfully executed, processing of the lookup ceases.
1217 This feature is intended for use in master/slave situations where updates
1218 are occurring, and one wants to update a master rather than a slave. If the
1219 masters are in the list for reading, you might have:
1221 mysql_servers = slave1/db/name/pw:slave2/db/name/pw:master/db/name/pw
1223 In an updating lookup, you could then write
1225 ${lookup mysql{servers=master; UPDATE ...}
1227 If, on the other hand, the master is not to be used for reading lookups:
1229 pgsql_servers = slave1/db/name/pw:slave2/db/name/pw
1231 you can still update the master by
1233 ${lookup pgsql{servers=master/db/name/pw; UPDATE ...}
1235 11. The message_body_newlines option (default FALSE, for backwards
1236 compatibility) can be used to control whether newlines are present in
1237 $message_body and $message_body_end. If it is FALSE, they are replaced by
1244 1. There is a new log selector called smtp_no_mail, which is not included in
1245 the default setting. When it is set, a line is written to the main log
1246 whenever an accepted SMTP connection terminates without having issued a
1249 2. When an item in a dnslists list is followed by = and & and a list of IP
1250 addresses, the behaviour was not clear when the lookup returned more than
1251 one IP address. This has been solved by the addition of == and =& for "all"
1252 rather than the default "any" matching.
1254 3. Up till now, the only control over which cipher suites GnuTLS uses has been
1255 for the cipher algorithms. New options have been added to allow some of the
1256 other parameters to be varied.
1258 4. There is a new compile-time option called ENABLE_DISABLE_FSYNC. When it is
1259 set, Exim compiles a runtime option called disable_fsync.
1261 5. There is a new variable called $smtp_count_at_connection_start.
1263 6. There's a new control called no_pipelining.
1265 7. There are two new variables called $sending_ip_address and $sending_port.
1266 These are set whenever an SMTP connection to another host has been set up.
1268 8. The expansion of the helo_data option in the smtp transport now happens
1269 after the connection to the server has been made.
1271 9. There is a new expansion operator ${rfc2047d: that decodes strings that
1272 are encoded as per RFC 2047.
1274 10. There is a new log selector called "pid", which causes the current process
1275 id to be added to every log line, in square brackets, immediately after the
1278 11. Exim has been modified so that it flushes SMTP output before implementing
1279 a delay in an ACL. It also flushes the output before performing a callout,
1280 as this can take a substantial time. These behaviours can be disabled by
1281 obeying control = no_delay_flush or control = no_callout_flush,
1282 respectively, at some earlier stage of the connection.
1284 12. There are two new expansion conditions that iterate over a list. They are
1285 called forany and forall.
1287 13. There's a new global option called dsn_from that can be used to vary the
1288 contents of From: lines in bounces and other automatically generated
1289 messages ("delivery status notifications" - hence the name of the option).
1291 14. The smtp transport has a new option called hosts_avoid_pipelining.
1293 15. By default, exigrep does case-insensitive matches. There is now a -I option
1294 that makes it case-sensitive.
1296 16. A number of new features ("addresses", "map", "filter", and "reduce") have
1297 been added to string expansions to make it easier to process lists of
1298 items, typically addresses.
1300 17. There's a new ACL modifier called "continue". It does nothing of itself,
1301 and processing of the ACL always continues with the next condition or
1302 modifier. It is provided so that the side effects of expanding its argument
1305 18. It is now possible to use newline and other control characters (those with
1306 values less than 32, plus DEL) as separators in lists.
1308 19. The exigrep utility now has a -v option, which inverts the matching
1311 20. The host_find_failed option in the manualroute router can now be set to
1318 No new features were added to 4.66.
1324 No new features were added to 4.65.
1330 1. ACL variables can now be given arbitrary names, as long as they start with
1331 "acl_c" or "acl_m" (for connection variables and message variables), are at
1332 least six characters long, with the sixth character being either a digit or
1335 2. There is a new ACL modifier called log_reject_target. It makes it possible
1336 to specify which logs are used for messages about ACL rejections.
1338 3. There is a new authenticator called "dovecot". This is an interface to the
1339 authentication facility of the Dovecot POP/IMAP server, which can support a
1340 number of authentication methods.
1342 4. The variable $message_headers_raw provides a concatenation of all the
1343 messages's headers without any decoding. This is in contrast to
1344 $message_headers, which does RFC2047 decoding on the header contents.
1346 5. In a DNS black list, if two domain names, comma-separated, are given, the
1347 second is used first to do an initial check, making use of any IP value
1348 restrictions that are set. If there is a match, the first domain is used,
1349 without any IP value restrictions, to get the TXT record.
1351 6. All authenticators now have a server_condition option.
1353 7. There is a new command-line option called -Mset. It is useful only in
1354 conjunction with -be (that is, when testing string expansions). It must be
1355 followed by a message id; Exim loads the given message from its spool
1356 before doing the expansions.
1358 8. Another similar new command-line option is called -bem. It operates like
1359 -be except that it must be followed by the name of a file that contains a
1362 9. When an address is delayed because of a 4xx response to a RCPT command, it
1363 is now the combination of sender and recipient that is delayed in
1364 subsequent queue runs until its retry time is reached.
1366 10. Unary negation and the bitwise logical operators and, or, xor, not, and
1367 shift, have been added to the eval: and eval10: expansion items.
1369 11. The variables $interface_address and $interface_port have been renamed
1370 as $received_ip_address and $received_port, to make it clear that they
1371 relate to message reception rather than delivery. (The old names remain
1372 available for compatibility.)
1374 12. The "message" modifier can now be used on "accept" and "discard" acl verbs
1375 to vary the message that is sent when an SMTP command is accepted.
1381 1. There is a new Boolean option called filter_prepend_home for the redirect
1384 2. There is a new acl, set by acl_not_smtp_start, which is run right at the
1385 start of receiving a non-SMTP message, before any of the message has been
1388 3. When an SMTP error message is specified in a "message" modifier in an ACL,
1389 or in a :fail: or :defer: message in a redirect router, Exim now checks the
1390 start of the message for an SMTP error code.
1392 4. There is a new parameter for LDAP lookups called "referrals", which takes
1393 one of the settings "follow" (the default) or "nofollow".
1395 5. Version 20070721.2 of exipick now included, offering these new options:
1397 After all other sorting options have bee processed, reverse order
1398 before displaying messages (-R is synonym).
1400 Randomize order of matching messages before displaying.
1402 Instead of displaying the matching messages, display the sum
1404 --sort <variable>[,<variable>...]
1405 Before displaying matching messages, sort the messages according to
1406 each messages value for each variable.
1408 Negate the value for every test (returns inverse output from the
1409 same criteria without --not).
1415 1. The ${readsocket expansion item now supports Internet domain sockets as well
1416 as Unix domain sockets. If the first argument begins "inet:", it must be of
1417 the form "inet:host:port". The port is mandatory; it may be a number or the
1418 name of a TCP port in /etc/services. The host may be a name, or it may be an
1419 IP address. An ip address may optionally be enclosed in square brackets.
1420 This is best for IPv6 addresses. For example:
1422 ${readsocket{inet:[::1]:1234}{<request data>}...
1424 Only a single host name may be given, but if looking it up yield more than
1425 one IP address, they are each tried in turn until a connection is made. Once
1426 a connection has been made, the behaviour is as for ${readsocket with a Unix
1429 2. If a redirect router sets up file or pipe deliveries for more than one
1430 incoming address, and the relevant transport has batch_max set greater than
1431 one, a batch delivery now occurs.
1433 3. The appendfile transport has a new option called maildirfolder_create_regex.
1434 Its value is a regular expression. For a maildir delivery, this is matched
1435 against the maildir directory; if it matches, Exim ensures that a
1436 maildirfolder file is created alongside the new, cur, and tmp directories.
1442 The documentation is up-to-date for the 4.61 release. Major new features since
1443 the 4.60 release are:
1445 . An option called disable_ipv6, to disable the use of IPv6 completely.
1447 . An increase in the number of ACL variables to 20 of each type.
1449 . A change to use $auth1, $auth2, and $auth3 in authenticators instead of $1,
1450 $2, $3, (though those are still set) because the numeric variables get used
1451 for other things in complicated expansions.
1453 . The default for rfc1413_query_timeout has been changed from 30s to 5s.
1455 . It is possible to use setclassresources() on some BSD OS to control the
1456 resources used in pipe deliveries.
1458 . A new ACL modifier called add_header, which can be used with any verb.
1460 . More errors are detectable in retry rules.
1462 There are a number of other additions too.
1468 The documentation is up-to-date for the 4.60 release. Major new features since
1469 the 4.50 release are:
1471 . Support for SQLite.
1473 . Support for IGNOREQUOTA in LMTP.
1475 . Extensions to the "submission mode" features.
1477 . Support for Client SMTP Authorization (CSA).
1479 . Support for ratelimiting hosts and users.
1481 . New expansion items to help with the BATV "prvs" scheme.
1483 . A "match_ip" condition, that matches an IP address against a list.
1485 There are many more minor changes.