4 This file contains descriptions of new features that have been added to Exim.
5 Before a formal release, there may be quite a lot of detail so that people can
6 test from the snapshots or the Git before the documentation is updated. Once
7 the documentation is updated, this file is reduced to a short list.
12 1. The fast-ramp two phase queue run support, previously experimental, is
13 now supported by default.
15 2. The native SRS support, previously experimental, is now supported. It is
16 not built unless specified in the Local/Makefile.
18 3. TLS resumption support, previously experimental, is now supported and
19 included in default builds.
21 4. Single-key LMDB lookups, previously experimental, are now supported.
22 The support is not built unless specified in the Local/Makefile.
24 5. Option "message_linelength_limit" on the smtp transport to enforce (by
25 default) the RFC 998 character limit.
27 6. An option to ignore the cache on a lookup.
29 7. Quota checking during reception (i.e. at SMTP time) for appendfile-
30 transport-managed quotas.
32 8. Sqlite lookups accept a "file=<path>" option to specify a per-operation
33 db file, replacing the previous prefix to the SQL string (which had
34 issues when the SQL used tainted values).
40 1. EXPERIMENTAL_SRS_NATIVE optional build feature. See the experimental.spec
43 2. Channel-binding for authenticators is now supported under OpenSSL.
44 Previously it was GnuTLS-only.
48 4. Client-side support in the gsasl authenticator. Tested against the
49 plaintext driver for PLAIN; only against itself for SCRAM-SHA-1 and
50 SCRAM-SHA-1-PLUS methods.
52 5. Server-side support in the gsasl authenticator for encrypted passwords, as
53 an alternate for the existing plaintext.
55 6. Variable $local_part_data now also set by router check_local_user option,
56 with an de-tainted version of $local_part.
58 7. Named-list definitions can now be prefixed "hide" so that "-bP" commands do
59 not output the content. Previously this could only be done on options.
61 8. As an exerimental feature, the dovecot authenticatino driver supports inet
62 sockets. Previously it was unix-domain sockets only.
64 9. The ACL control "queue_only" can also be spelled "queue", and now takes an
65 option "first_pass_route" to do the same as a "-odqs" on the command line.
67 10. Items specified for the router and transport headers_remove option can use
68 a trailing asterisk to specify globbing.
70 11. New $queue_size variable.
72 12. New variables $local_part_{pre,suf}fix_v.
74 13. New main option "sqlite_dbfile", for use in preference to prefixing the
75 lookup string. The older method fails when tainted variables are used
76 in the lookup, as the filename becomes tainted. The new method keeps the
79 14. Options on the dsearch lookup, to return the full path and to filter
80 filetypes for matching.
82 15. Options on pgsql and mysql lookups, to specify server separate from the
85 16. An option on all single-key lookups, to return (on a hit) a de-tainted
86 version of the lookup key rather than the looked-up data.
88 17. $domain_data and $localpart_data are now set by all list-match successes.
89 Previously only list items that performed lookups did so.
90 Also, matching list items that are tail-match or RE-match now set the
91 numeric variables $0 (etc) in the same way os other RE matches.
93 18. Expansion item ${listquote {<char} {<item>}}.
95 19. An option for the ${readsocket {}{}{}} expansion to make the result data
98 20. dkim_verify_min_keysizes, a list of minimum acceptable public-key sizes.
100 21. bounce_message_file and warn_message_file are now expanded before use.
102 22. New main config option spf_smtp_comment_template to customise the
103 $spf_smtp_comment variable
110 1. An "external" authenticator, per RFC 4422 Appendix A.
112 2. A JSON lookup type, and JSON variants of the forall/any expansion conditions.
114 3. Variables $tls_in_cipher_std, $tls_out_cipher_std giving the RFC names
117 4. Log_selectors "msg_id" (on by default) and "msg_id_created".
119 5. A case_insensitive option for verify=not_blind.
121 6. EXPERIMENTAL_TLS_RESUME optional build feature. See the experimental.spec
124 7. A main option exim_version to override the version Exim
125 reports in verious places ($exim_version, $version_number).
127 8. Expansion operator ${sha2_N:} for N=256, 384, 512.
129 9. Router variables, $r_... settable from router options and usable in routers
132 10. The spf lookup now supports IPv6.
134 11. Main options for DKIM verify to filter hash and key types.
136 12. With TLS1.3, support for full-chain OCSP stapling.
138 13. Dual-certificate stacks on servers now support OCSP stapling, under OpenSSL.
140 14: An smtp:ehlo transport event, for observability of the remote offered features.
142 15: Support under OpenSSL for writing NSS-style key files for packet-capture
143 decode. The environment variable SSLKEYLOGFILE is used; if an absolute path
144 it must indicate a file under the spool directory; if relative the the spool
145 directory is prepended. Works on the server side only. Support under
146 GnuTLS was already there, being done purely by the library (server side
147 only, and exim must be run as root).
149 16: Command-line option to move messages from one named queue to another.
151 17. Variables $tls_in_ver, $tls_out_ver.
157 1. ${l_header:<name>} and ${l_h:<name>} expansion items, giving a colon-sep
158 list when there are multiple headers having a given name. This matters
159 when individual headers are wrapped onto multiple lines; with previous
160 facilities hard to parse.
162 2. The ${readsocket } expansion item now takes a "tls" option, doing the
165 3. EXPERIMENTAL_REQUIRETLS and EXPERIMENTAL_PIPE_CONNECT optional build
166 features. See the experimental.spec file.
168 4. If built with SUPPORT_I18N a "utf8_downconvert" option on the smtp transport.
170 5. A "pipelining" log_selector.
172 6. Builtin macros for supported log_selector and openssl_options values.
174 7. JSON variants of the ${extract } expansion item.
176 8. A "noutf8" debug option, for disabling the UTF-8 characters in debug output.
178 9. TCP Fast Open support on MacOS.
183 1. Dual-certificate stacks on servers now support OCSP stapling, under GnuTLS
184 version 3.5.6 or later.
186 2. DANE is now supported under GnuTLS version 3.0.0 or later. Both GnuTLS and
187 OpenSSL versions are moved to mainline support from Experimental.
188 New SMTP transport option "dane_require_tls_ciphers".
190 3. Feature macros for the compiled-in set of malware scanner interfaces.
192 4. SPF support is promoted from Experimental to mainline status. The template
193 src/EDITME makefile does not enable its inclusion.
195 5. Logging control for DKIM verification. The existing DKIM log line is
196 controlled by a "dkim_verbose" selector which is _not_ enabled by default.
197 A new tag "DKIM=<domain>" is added to <= lines by default, controlled by
198 a "dkim" log_selector.
200 6. Receive duration on <= lines, under a new log_selector "receive_time".
202 7. Options "ipv4_only" and "ipv4_prefer" on the dnslookup router and on
203 routing rules in the manualroute router.
205 8. Expansion item ${sha3:<string>} / ${sha3_<N>:<string>} now also supported
206 under OpenSSL version 1.1.1 or later.
208 9. DKIM operations can now use the Ed25519 algorithm in addition to RSA, under
209 GnuTLS 3.6.0 or OpenSSL 1.1.1 or later.
211 10. Builtin feature-macros _CRYPTO_HASH_SHA3 and _CRYPTO_SIGN_ED25519, library
214 11. "exim -bP macro <name>" returns caller-usable status.
216 12. Expansion item ${authresults {<machine>}} for creating an
217 Authentication-Results: header.
219 13. EXPERIMENTAL_ARC. See the experimental.spec file.
220 See also new util/renew-opendmarc-tlds.sh script for use with DMARC/ARC.
222 14: A dane:fail event, intended to facilitate reporting.
224 15. "Lightweight" support for Redis Cluster. Requires redis_servers list to
225 contain all the servers in the cluster, all of which must be reachable from
226 the running exim instance. If the cluster has master/slave replication, the
227 list must contain all the master and slave servers.
229 16. Add an option to the Avast scanner interface: "pass_unscanned". This
230 allows to treat unscanned files as clean. Files may be unscanned for
231 several reasons: decompression bombs, broken archives.
237 1. PKG_CONFIG_PATH can now be set in Local/Makefile;
238 wildcards will be expanded, values are collapsed.
240 2. The ${readsocket } expansion now takes an option to not shutdown the
241 connection after sending the query string. The default remains to do so.
243 3. An smtp transport option "hosts_noproxy_tls" to control whether multiple
244 deliveries on a single TCP connection can maintain a TLS connection
245 open. By default disabled for all hosts, doing so saves the cost of
246 making new TLS sessions, at the cost of having to proxy the data via
247 another process. Logging is also affected.
249 4. A malware connection type for the FPSCAND protocol.
251 5. An option for recipient verify callouts to hold the connection open for
252 further recipients and for delivery.
254 6. The reproducible build $SOURCE_DATE_EPOCH environment variable is now
257 7. Optionally, an alternate format for spool data-files which matches the
258 wire format - meaning more efficient reception and transmission (at the
259 cost of difficulty with standard Unix tools). Only used for messages
260 received using the ESMTP CHUNKING option, and when a new main-section
261 option "spool_wireformat" (false by default) is set.
263 8. New main configuration option "commandline_checks_require_admin" to
264 restrict who can use various introspection options.
266 9. New option modifier "no_check" for quota and quota_filecount
267 appendfile transport.
269 10. Variable $smtp_command_history returning a comma-sep list of recent
272 11. Millisecond timetamps in logs, on log_selector "millisec". Also affects
273 log elements QT, DT and D, and timstamps in debug output.
275 12. TCP Fast Open logging. As a server, logs when the SMTP banner was sent
276 while still in SYN_RECV state; as a client logs when the connection
277 is opened with a TFO cookie.
279 13. DKIM support for multiple signing, by domain and/or key-selector.
280 DKIM support for multiple hashes, and for alternate-identity tags.
281 Builtin macro with default list of signed headers.
282 Better syntax for specifying oversigning.
283 The DKIM ACL can override verification status, and status is visible in
286 14. Exipick understands -C|--config for an alternative Exim
289 15. TCP Fast Open used, with data-on-SYN, for client SMTP via SOCKS5 proxy,
290 for ${readsocket } expansions, and for ClamAV.
292 16. The "-be" expansion test mode now supports macros. Macros are expanded
293 in test lines, and new macros can be defined.
295 17. Support for server-side dual-certificate-stacks (eg. RSA + ECDSA).
301 1. Allow relative config file names for ".include"
303 2. A main-section config option "debug_store" to control the checks on
304 variable locations during store-reset. Normally false but can be enabled
305 when a memory corruption issue is suspected on a production system.
311 1. The new perl_taintmode option allows to run the embedded perl
312 interpreter in taint mode.
314 2. New log_selector: dnssec, adds a "DS" tag to acceptance and delivery lines.
316 3. Speculative debugging, via a "kill" option to the "control=debug" ACL
319 4. New expansion item ${sha3:<string>} / ${sha3_<N>:<string>}.
320 N can be 224, 256 (default), 384, 512.
321 With GnuTLS 3.5.0 or later, only.
323 5. Facility for named queues: A command-line argument can specify
324 the queue name for a queue operation, and an ACL modifier can set
325 the queue to be used for a message. A $queue_name variable gives
328 6. New expansion operators base32/base32d.
330 7. The CHUNKING ESMTP extension from RFC 3030. May give some slight
331 performance increase and network load decrease. Main config option
332 chunking_advertise_hosts, and smtp transport option hosts_try_chunking
335 8. LMDB lookup support, as Experimental. Patch supplied by Andrew Colin Kissa.
337 9. Expansion operator escape8bit, like escape but not touching newline etc..
339 10. Feature macros, generated from compile options. All start with "_HAVE_"
340 and go on with some roughly recognisable name. Driver macros, for
341 router, transport and authentication drivers; names starting with "_DRIVER_".
342 Option macros, for each configuration-file option; all start with "_OPT_".
343 Use the "-bP macros" command-line option to see what is present.
345 11. Integer values for options can take a "G" multiplier.
347 12. defer=pass option for the ACL control cutthrough_delivery, to reflect 4xx
348 returns from the target back to the initiator, rather than spooling the
351 13. New built-in constants available for tls_dhparam and default changed.
353 14. If built with EXPERIMENTAL_QUEUEFILE, a queuefile transport, for writing
354 out copies of the message spool files for use by 3rd-party scanners.
356 15. A new option on the smtp transport, hosts_try_fastopen. If the system
357 supports it (on Linux it must be enabled in the kernel by the sysadmin)
358 try to use RFC 7413 "TCP Fast Open". No data is sent on the SYN segment
359 but it permits a peer that also supports the facility to send its SMTP
360 banner immediately after the SYN,ACK segment rather then waiting for
361 another ACK - so saving up to one roundtrip time. Because it requires
362 previous communication with the peer (we save a cookie from it) this
363 will only become active on frequently-contacted destinations.
365 16. A new syslog_pid option to suppress PID duplication in syslog lines.
371 1. The ACL conditions regex and mime_regex now capture substrings
372 into numeric variables $regex1 to 9, like the "match" expansion condition.
374 2. New $callout_address variable records the address used for a spam=,
375 malware= or verify= callout.
377 3. Transports now take a "max_parallel" option, to limit concurrency.
379 4. Expansion operators ${ipv6norm:<string>} and ${ipv6denorm:<string>}.
380 The latter expands to a 8-element colon-sep set of hex digits including
381 leading zeroes. A trailing ipv4-style dotted-decimal set is converted
382 to hex. Pure ipv4 addresses are converted to IPv4-mapped IPv6.
383 The former operator strips leading zeroes and collapses the longest
384 set of 0-groups to a double-colon.
386 5. New "-bP config" support, to dump the effective configuration.
388 6. New $dkim_key_length variable.
390 7. New base64d and base64 expansion items (the existing str2b64 being a
391 synonym of the latter). Add support in base64 for certificates.
393 8. New main configuration option "bounce_return_linesize_limit" to
394 avoid oversize bodies in bounces. The default value matches RFC
397 9. New $initial_cwd expansion variable.
403 1. Support for using the system standard CA bundle.
405 2. New expansion items $config_file, $config_dir, containing the file
406 and directory name of the main configuration file. Also $exim_version.
408 3. New "malware=" support for Avast.
410 4. New "spam=" variant option for Rspamd.
412 5. Assorted options on malware= and spam= scanners.
414 6. A command-line option to write a comment into the logfile.
416 7. If built with EXPERIMENTAL_SOCKS feature enabled, the smtp transport can
417 be configured to make connections via socks5 proxies.
419 8. If built with EXPERIMENTAL_INTERNATIONAL, support is included for
420 the transmission of UTF-8 envelope addresses.
422 9. If built with EXPERIMENTAL_INTERNATIONAL, an expansion item for a commonly
423 used encoding of Maildir folder names.
425 10. A logging option for slow DNS lookups.
427 11. New ${env {<variable>}} expansion.
429 12. A non-SMTP authenticator using information from TLS client certificates.
431 13. Main option "tls_eccurve" for selecting an Elliptic Curve for TLS.
432 Patch originally by Wolfgang Breyha.
434 14. Main option "dns_trust_aa" for trusting your local nameserver at the
435 same level as DNSSEC.
440 1. If built with EXPERIMENTAL_DANE feature enabled, Exim will follow the
441 DANE SMTP draft to assess a secure chain of trust of the certificate
442 used to establish the TLS connection based on a TLSA record in the
443 domain of the sender.
445 2. The EXPERIMENTAL_TPDA feature has been renamed to EXPERIMENTAL_EVENT
446 and several new events have been created. The reason is because it has
447 been expanded beyond just firing events during the transport phase. Any
448 existing TPDA transport options will have to be rewritten to use a new
449 $event_name expansion variable in a condition. Refer to the
450 experimental-spec.txt for details and examples.
452 3. The EXPERIMENTAL_CERTNAMES features is an enhancement to verify that
453 server certs used for TLS match the result of the MX lookup. It does
454 not use the same mechanism as DANE.
464 1. If built with the EXPERIMENTAL_PROXY feature enabled, Exim can be
465 configured to expect an initial header from a proxy that will make the
466 actual external source IP:host be used in exim instead of the IP of the
467 proxy that is connecting to it.
469 2. New verify option header_names_ascii, which will check to make sure
470 there are no non-ASCII characters in header names. Exim itself handles
471 those non-ASCII characters, but downstream apps may not, so Exim can
472 detect and reject if those characters are present.
474 3. New expansion operator ${utf8clean:string} to replace malformed UTF8
475 codepoints with valid ones.
477 4. New malware type "sock". Talks over a Unix or TCP socket, sending one
478 command line and matching a regex against the return data for trigger
479 and a second regex to extract malware_name. The mail spoolfile name can
480 be included in the command line.
482 5. The smtp transport now supports options "tls_verify_hosts" and
483 "tls_try_verify_hosts". If either is set the certificate verification
484 is split from the encryption operation. The default remains that a failed
485 verification cancels the encryption.
487 6. New SERVERS override of default ldap server list. In the ACLs, an ldap
488 lookup can now set a list of servers to use that is different from the
491 7. New command-line option -C for exiqgrep to specify alternate exim.conf
492 file when searching the queue.
494 8. OCSP now supports GnuTLS also, if you have version 3.1.3 or later of that.
496 9. Support for DNSSEC on outbound connections.
498 10. New variables "tls_(in,out)_(our,peer)cert" and expansion item
499 "certextract" to extract fields from them. Hash operators md5 and sha1
500 work over them for generating fingerprints, and a new sha256 operator
503 11. PRDR is now supported dy default.
505 12. OCSP stapling is now supported by default.
507 13. If built with the EXPERIMENTAL_DSN feature enabled, Exim will output
508 Delivery Status Notification messages in MIME format, and negotiate
509 DSN features per RFC 3461.
515 1. New command-line option -bI:sieve will list all supported sieve extensions
516 of this Exim build on standard output, one per line.
517 ManageSieve (RFC 5804) providers managing scripts for use by Exim should
518 query this to establish the correct list to include in the protocol's
519 SIEVE capability line.
521 2. If the -n option is combined with the -bP option, then the name of an
522 emitted option is not output, only the value (if visible to you).
523 For instance, "exim -n -bP pid_file_path" should just emit a pathname
524 followed by a newline, and no other text.
526 3. When built with SUPPORT_TLS and USE_GNUTLS, the SMTP transport driver now
527 has a "tls_dh_min_bits" option, to set the minimum acceptable number of
528 bits in the Diffie-Hellman prime offered by a server (in DH ciphersuites)
529 acceptable for security. (Option accepted but ignored if using OpenSSL).
530 Defaults to 1024, the old value. May be lowered only to 512, or raised as
531 far as you like. Raising this may hinder TLS interoperability with other
532 sites and is not currently recommended. Lowering this will permit you to
533 establish a TLS session which is not as secure as you might like.
535 Unless you really know what you are doing, leave it alone.
537 4. If not built with DISABLE_DNSSEC, Exim now has the main option
538 dns_dnssec_ok; if set to 1 then Exim will initialise the resolver library
539 to send the DO flag to your recursive resolver. If you have a recursive
540 resolver, which can set the Authenticated Data (AD) flag in results, Exim
541 can now detect this. Exim does not perform validation itself, instead
542 relying upon a trusted path to the resolver.
544 Current status: work-in-progress; $sender_host_dnssec variable added.
546 5. DSCP support for outbound connections: on a transport using the smtp driver,
547 set "dscp = ef", for instance, to cause the connections to have the relevant
548 DSCP (IPv4 TOS or IPv6 TCLASS) value in the header.
550 Similarly for inbound connections, there is a new control modifier, dscp,
551 so "warn control = dscp/ef" in the connect ACL, or after authentication.
553 Supported values depend upon system libraries. "exim -bI:dscp" to list the
554 ones Exim knows of. You can also set a raw number 0..0x3F.
556 6. The -G command-line flag is no longer ignored; it is now equivalent to an
557 ACL setting "control = suppress_local_fixups". The -L command-line flag
558 is now accepted and forces use of syslog, with the provided tag as the
559 process name. A few other flags used by Sendmail are now accepted and
562 7. New cutthrough routing feature. Requested by a "control = cutthrough_delivery"
563 ACL modifier; works for single-recipient mails which are received on and
564 deliverable via SMTP. Using the connection made for a recipient verify,
565 if requested before the verify, or a new one made for the purpose while
566 the inbound connection is still active. The bulk of the mail item is copied
567 direct from the inbound socket to the outbound (as well as the spool file).
568 When the source notifies the end of data, the data acceptance by the destination
569 is negotiated before the acceptance is sent to the source. If the destination
570 does not accept the mail item, for example due to content-scanning, the item
571 is not accepted from the source and therefore there is no need to generate
572 a bounce mail. This is of benefit when providing a secondary-MX service.
573 The downside is that delays are under the control of the ultimate destination
576 The Received-by: header on items delivered by cutthrough is generated
577 early in reception rather than at the end; this will affect any timestamp
578 included. The log line showing delivery is recorded before that showing
579 reception; it uses a new ">>" tag instead of "=>".
581 To support the feature, verify-callout connections can now use ESMTP and TLS.
582 The usual smtp transport options are honoured, plus a (new, default everything)
583 hosts_verify_avoid_tls.
585 New variable families named tls_in_cipher, tls_out_cipher etc. are introduced
586 for specific access to the information for each connection. The old names
587 are present for now but deprecated.
589 Not yet supported: IGNOREQUOTA, SIZE, PIPELINING.
591 8. New expansion operators ${listnamed:name} to get the content of a named list
592 and ${listcount:string} to count the items in a list.
594 9. New global option "gnutls_allow_auto_pkcs11", defaults false. The GnuTLS
595 rewrite in 4.80 combines with GnuTLS 2.12.0 or later, to autoload PKCS11
596 modules. For some situations this is desirable, but we expect admin in
597 those situations to know they want the feature. More commonly, it means
598 that GUI user modules get loaded and are broken by the setuid Exim being
599 unable to access files specified in environment variables and passed
600 through, thus breakage. So we explicitly inhibit the PKCS11 initialisation
601 unless this new option is set.
603 Some older OS's with earlier versions of GnuTLS might not have pkcs11 ability,
604 so have also added a build option which can be used to build Exim with GnuTLS
605 but without trying to use any kind of PKCS11 support. Uncomment this in the
608 AVOID_GNUTLS_PKCS11=yes
610 10. The "acl = name" condition on an ACL now supports optional arguments.
611 New expansion item "${acl {name}{arg}...}" and expansion condition
612 "acl {{name}{arg}...}" are added. In all cases up to nine arguments
613 can be used, appearing in $acl_arg1 to $acl_arg9 for the called ACL.
614 Variable $acl_narg contains the number of arguments. If the ACL sets
615 a "message =" value this becomes the result of the expansion item,
616 or the value of $value for the expansion condition. If the ACL returns
617 accept the expansion condition is true; if reject, false. A defer
618 return results in a forced fail.
620 11. Routers and transports can now have multiple headers_add and headers_remove
621 option lines. The concatenated list is used.
623 12. New ACL modifier "remove_header" can remove headers before message gets
624 handled by routers/transports.
626 13. New dnsdb lookup pseudo-type "a+". A sequence of "a6" (if configured),
627 "aaaa" and "a" lookups is done and the full set of results returned.
629 14. New expansion variable $headers_added with content from ACL add_header
630 modifier (but not yet added to message).
632 15. New 8bitmime status logging option for received messages. Log field "M8S".
634 16. New authenticated_sender logging option, adding to log field "A".
636 17. New expansion variables $router_name and $transport_name. Useful
637 particularly for debug_print as -bt command-line option does not
638 require privilege whereas -d does.
640 18. If built with EXPERIMENTAL_PRDR, per-recipient data responses per a
641 proposed extension to SMTP from Eric Hall.
643 19. The pipe transport has gained the force_command option, to allow
644 decorating commands from user .forward pipe aliases with prefix
645 wrappers, for instance.
647 20. Callout connections can now AUTH; the same controls as normal delivery
650 21. Support for DMARC, using opendmarc libs, can be enabled. It adds new
651 options: dmarc_forensic_sender, dmarc_history_file, and dmarc_tld_file.
652 It adds new expansion variables $dmarc_ar_header, $dmarc_status,
653 $dmarc_status_text, and $dmarc_used_domain. It adds a new acl modifier
654 dmarc_status. It adds new control flags dmarc_disable_verify and
655 dmarc_enable_forensic. The default for the dmarc_tld_file option is
656 "/etc/exim/opendmarc.tlds" and can be changed via EDITME.
658 22. Add expansion variable $authenticated_fail_id, which is the username
659 provided to the authentication method which failed. It is available
660 for use in subsequent ACL processing (typically quit or notquit ACLs).
662 23. New ACL modifier "udpsend" can construct a UDP packet to send to a given
665 24. New ${hexquote:..string..} expansion operator converts non-printable
666 characters in the string to \xNN form.
668 25. Experimental TPDA (Transport Post Delivery Action) function added.
669 Patch provided by Axel Rau.
671 26. Experimental Redis lookup added. Patch provided by Warren Baker.
677 1. New authenticator driver, "gsasl". Server-only (at present).
678 This is a SASL interface, licensed under GPL, which can be found at
679 http://www.gnu.org/software/gsasl/.
680 This system does not provide sources of data for authentication, so
681 careful use needs to be made of the conditions in Exim.
683 2. New authenticator driver, "heimdal_gssapi". Server-only.
684 A replacement for using cyrus_sasl with Heimdal, now that $KRB5_KTNAME
685 is no longer honoured for setuid programs by Heimdal. Use the
686 "server_keytab" option to point to the keytab.
688 3. The "pkg-config" system can now be used when building Exim to reference
689 cflags and library information for lookups and authenticators, rather
690 than having to update "CFLAGS", "AUTH_LIBS", "LOOKUP_INCLUDE" and
691 "LOOKUP_LIBS" directly. Similarly for handling the TLS library support
692 without adjusting "TLS_INCLUDE" and "TLS_LIBS".
694 In addition, setting PCRE_CONFIG=yes will query the pcre-config tool to
695 find the headers and libraries for PCRE.
697 4. New expansion variable $tls_bits.
699 5. New lookup type, "dbmjz". Key is an Exim list, the elements of which will
700 be joined together with ASCII NUL characters to construct the key to pass
701 into the DBM library. Can be used with gsasl to access sasldb2 files as
704 6. OpenSSL now supports TLS1.1 and TLS1.2 with OpenSSL 1.0.1.
706 Avoid release 1.0.1a if you can. Note that the default value of
707 "openssl_options" is no longer "+dont_insert_empty_fragments", as that
708 increased susceptibility to attack. This may still have interoperability
709 implications for very old clients (see version 4.31 change 37) but
710 administrators can choose to make the trade-off themselves and restore
711 compatibility at the cost of session security.
713 7. Use of the new expansion variable $tls_sni in the main configuration option
714 tls_certificate will cause Exim to re-expand the option, if the client
715 sends the TLS Server Name Indication extension, to permit choosing a
716 different certificate; tls_privatekey will also be re-expanded. You must
717 still set these options to expand to valid files when $tls_sni is not set.
719 The SMTP Transport has gained the option tls_sni, which will set a hostname
720 for outbound TLS sessions, and set $tls_sni too.
722 A new log_selector, +tls_sni, has been added, to log received SNI values
723 for Exim as a server.
725 8. The existing "accept_8bitmime" option now defaults to true. This means
726 that Exim is deliberately not strictly RFC compliant. We're following
727 Dan Bernstein's advice in http://cr.yp.to/smtp/8bitmime.html by default.
728 Those who disagree, or know that they are talking to mail servers that,
729 even today, are not 8-bit clean, need to turn off this option.
731 9. Exim can now be started with -bw (with an optional timeout, given as
732 -bw<timespec>). With this, stdin at startup is a socket that is
733 already listening for connections. This has a more modern name of
734 "socket activation", but forcing the activated socket to fd 0. We're
735 interested in adding more support for modern variants.
737 10. ${eval } now uses 64-bit values on supporting platforms. A new "G" suffix
738 for numbers indicates multiplication by 1024^3.
740 11. The GnuTLS support has been revamped; the three options gnutls_require_kx,
741 gnutls_require_mac & gnutls_require_protocols are no longer supported.
742 tls_require_ciphers is now parsed by gnutls_priority_init(3) as a priority
743 string, documentation for which is at:
744 http://www.gnutls.org/manual/html_node/Priority-Strings.html
746 SNI support has been added to Exim's GnuTLS integration too.
748 For sufficiently recent GnuTLS libraries, ${randint:..} will now use
749 gnutls_rnd(), asking for GNUTLS_RND_NONCE level randomness.
751 12. With OpenSSL, if built with EXPERIMENTAL_OCSP, a new option tls_ocsp_file
752 is now available. If the contents of the file are valid, then Exim will
753 send that back in response to a TLS status request; this is OCSP Stapling.
754 Exim will not maintain the contents of the file in any way: administrators
755 are responsible for ensuring that it is up-to-date.
757 See "experimental-spec.txt" for more details.
759 13. ${lookup dnsdb{ }} supports now SPF record types. They are handled
760 identically to TXT record lookups.
762 14. New expansion variable $tod_epoch_l for higher-precision time.
764 15. New global option tls_dh_max_bits, defaulting to current value of NSS
765 hard-coded limit of DH ephemeral bits, to fix interop problems caused by
766 GnuTLS 2.12 library recommending a bit count higher than NSS supports.
768 16. tls_dhparam now used by both OpenSSL and GnuTLS, can be path or identifier.
769 Option can now be a path or an identifier for a standard prime.
770 If unset, we use the DH prime from section 2.2 of RFC 5114, "ike23".
771 Set to "historic" to get the old GnuTLS behaviour of auto-generated DH
774 17. SSLv2 now disabled by default in OpenSSL. (Never supported by GnuTLS).
775 Use "openssl_options -no_sslv2" to re-enable support, if your OpenSSL
776 install was not built with OPENSSL_NO_SSL2 ("no-ssl2").
782 1. New options for the ratelimit ACL condition: /count= and /unique=.
783 The /noupdate option has been replaced by a /readonly option.
785 2. The SMTP transport's protocol option may now be set to "smtps", to
786 use SSL-on-connect outbound.
788 3. New variable $av_failed, set true if the AV scanner deferred; ie, when
789 there is a problem talking to the AV scanner, or the AV scanner running.
791 4. New expansion conditions, "inlist" and "inlisti", which take simple lists
792 and check if the search item is a member of the list. This does not
793 support named lists, but does subject the list part to string expansion.
795 5. Unless the new EXPAND_LISTMATCH_RHS build option is set when Exim was
796 built, Exim no longer performs string expansion on the second string of
797 the match_* expansion conditions: "match_address", "match_domain",
798 "match_ip" & "match_local_part". Named lists can still be used.
804 1. The global option "dns_use_edns0" may be set to coerce EDNS0 usage on
805 or off in the resolver library.
811 1. In addition to the existing LDAP and LDAP/SSL ("ldaps") support, there
812 is now LDAP/TLS support, given sufficiently modern OpenLDAP client
813 libraries. The following global options have been added in support of
814 this: ldap_ca_cert_dir, ldap_ca_cert_file, ldap_cert_file, ldap_cert_key,
815 ldap_cipher_suite, ldap_require_cert, ldap_start_tls.
817 2. The pipe transport now takes a boolean option, "freeze_signal", default
818 false. When true, if the external delivery command exits on a signal then
819 Exim will freeze the message in the queue, instead of generating a bounce.
821 3. Log filenames may now use %M as an escape, instead of %D (still available).
822 The %M pattern expands to yyyymm, providing month-level resolution.
824 4. The $message_linecount variable is now updated for the maildir_tag option,
825 in the same way as $message_size, to reflect the real number of lines,
826 including any header additions or removals from transport.
828 5. When contacting a pool of SpamAssassin servers configured in spamd_address,
829 Exim now selects entries randomly, to better scale in a cluster setup.
835 1. SECURITY FIX: privilege escalation flaw fixed. On Linux (and only Linux)
836 the flaw permitted the Exim run-time user to cause root to append to
837 arbitrary files of the attacker's choosing, with the content based
838 on content supplied by the attacker.
840 2. Exim now supports loading some lookup types at run-time, using your
841 platform's dlopen() functionality. This has limited platform support
842 and the intention is not to support every variant, it's limited to
843 dlopen(). This permits the main Exim binary to not be linked against
844 all the libraries needed for all the lookup types.
850 NOTE: this version is not guaranteed backwards-compatible, please read the
851 items below carefully
853 1. A new main configuration option, "openssl_options", is available if Exim
854 is built with SSL support provided by OpenSSL. The option allows
855 administrators to specify OpenSSL options to be used on connections;
856 typically this is to set bug compatibility features which the OpenSSL
857 developers have not enabled by default. There may be security
858 consequences for certain options, so these should not be changed
861 2. A new pipe transport option, "permit_coredumps", may help with problem
862 diagnosis in some scenarios. Note that Exim is typically installed as
863 a setuid binary, which on most OSes will inhibit coredumps by default,
864 so that safety mechanism would have to be overridden for this option to
865 be able to take effect.
867 3. ClamAV 0.95 is now required for ClamAV support in Exim, unless
868 Local/Makefile sets: WITH_OLD_CLAMAV_STREAM=yes
869 Note that this switches Exim to use a new API ("INSTREAM") and a future
870 release of ClamAV will remove support for the old API ("STREAM").
872 The av_scanner option, when set to "clamd", now takes an optional third
873 part, "local", which causes Exim to pass a filename to ClamAV instead of
874 the file content. This is the same behaviour as when clamd is pointed at
875 a Unix-domain socket. For example:
877 av_scanner = clamd:192.0.2.3 1234:local
879 ClamAV's ExtendedDetectionInfo response format is now handled.
881 4. There is now a -bmalware option, restricted to admin users. This option
882 takes one parameter, a filename, and scans that file with Exim's
883 malware-scanning framework. This is intended purely as a debugging aid
884 to ensure that Exim's scanning is working, not to replace other tools.
885 Note that the ACL framework is not invoked, so if av_scanner references
886 ACL variables without a fallback then this will fail.
888 5. There is a new expansion operator, "reverse_ip", which will reverse IP
889 addresses; IPv4 into dotted quad, IPv6 into dotted nibble. Examples:
891 ${reverse_ip:192.0.2.4}
893 ${reverse_ip:2001:0db8:c42:9:1:abcd:192.0.2.3}
894 -> 3.0.2.0.0.0.0.c.d.c.b.a.1.0.0.0.9.0.0.0.2.4.c.0.8.b.d.0.1.0.0.2
896 6. There is a new ACL control called "debug", to enable debug logging.
897 This allows selective logging of certain incoming transactions within
898 production environments, with some care. It takes two options, "tag"
899 and "opts"; "tag" is included in the filename of the log and "opts"
900 is used as per the -d<options> command-line option. Examples, which
901 don't all make sense in all contexts:
904 control = debug/tag=.$sender_host_address
905 control = debug/opts=+expand+acl
906 control = debug/tag=.$message_exim_id/opts=+expand
908 7. It has always been implicit in the design and the documentation that
909 "the Exim user" is not root. src/EDITME said that using root was
910 "very strongly discouraged". This is not enough to keep people from
911 shooting themselves in the foot in days when many don't configure Exim
912 themselves but via package build managers. The security consequences of
913 running various bits of network code are severe if there should be bugs in
914 them. As such, the Exim user may no longer be root. If configured
915 statically, Exim will refuse to build. If configured as ref:user then Exim
916 will exit shortly after start-up. If you must shoot yourself in the foot,
917 then henceforth you will have to maintain your own local patches to strip
920 8. There is a new expansion condition, bool_lax{}. Where bool{} uses the ACL
921 condition logic to determine truth/failure and will fail to expand many
922 strings, bool_lax{} uses the router condition logic, where most strings
924 Note: bool{00} is false, bool_lax{00} is true.
926 9. Routers now support multiple "condition" tests.
928 10. There is now a runtime configuration option "tcp_wrappers_daemon_name".
929 Setting this allows an admin to define which entry in the tcpwrappers
930 config file will be used to control access to the daemon. This option
931 is only available when Exim is built with USE_TCP_WRAPPERS. The
932 default value is set at build time using the TCP_WRAPPERS_DAEMON_NAME
935 11. [POSSIBLE CONFIG BREAKAGE] The default value for system_filter_user is now
936 the Exim run-time user, instead of root.
938 12. [POSSIBLE CONFIG BREAKAGE] ALT_CONFIG_ROOT_ONLY is no longer optional and
939 is forced on. This is mitigated by the new build option
940 TRUSTED_CONFIG_LIST which defines a list of configuration files which
941 are trusted; one per line. If a config file is owned by root and matches
942 a pathname in the list, then it may be invoked by the Exim build-time
943 user without Exim relinquishing root privileges.
945 13. [POSSIBLE CONFIG BREAKAGE] The Exim user is no longer automatically
946 trusted to supply -D<Macro[=Value]> overrides on the command-line. Going
947 forward, we recommend using TRUSTED_CONFIG_LIST with shim configs that
948 include the main config. As a transition mechanism, we are temporarily
949 providing a work-around: the new build option WHITELIST_D_MACROS provides
950 a colon-separated list of macro names which may be overridden by the Exim
951 run-time user. The values of these macros are constrained to the regex
952 ^[A-Za-z0-9_/.-]*$ (which explicitly does allow for empty values).
958 1. TWO SECURITY FIXES: one relating to mail-spools which are globally
959 writable, the other to locking of MBX folders (not mbox).
961 2. MySQL stored procedures are now supported.
963 3. The dkim_domain transport option is now a list, not a single string, and
964 messages will be signed for each element in the list (discarding
967 4. The 4.70 release unexpectedly changed the behaviour of dnsdb TXT lookups
968 in the presence of multiple character strings within the RR. Prior to 4.70,
969 only the first string would be returned. The dnsdb lookup now, by default,
970 preserves the pre-4.70 semantics, but also now takes an extended output
971 separator specification. The separator can be followed by a semicolon, to
972 concatenate the individual text strings together with no join character,
973 or by a comma and a second separator character, in which case the text
974 strings within a TXT record are joined on that second character.
975 Administrators are reminded that DNS provides no ordering guarantees
976 between multiple records in an RRset. For example:
978 foo.example. IN TXT "a" "b" "c"
979 foo.example. IN TXT "d" "e" "f"
981 ${lookup dnsdb{>/ txt=foo.example}} -> "a/d"
982 ${lookup dnsdb{>/; txt=foo.example}} -> "def/abc"
983 ${lookup dnsdb{>/,+ txt=foo.example}} -> "a+b+c/d+e+f"
989 1. Native DKIM support without an external library.
990 (Note that if no action to prevent it is taken, a straight upgrade will
991 result in DKIM verification of all signed incoming emails. See spec
992 for details on conditionally disabling)
994 2. Experimental DCC support via dccifd (contributed by Wolfgang Breyha).
996 3. There is now a bool{} expansion condition which maps certain strings to
997 true/false condition values (most likely of use in conjunction with the
998 and{} expansion operator).
1000 4. The $spam_score, $spam_bar and $spam_report variables are now available
1003 5. exim -bP now supports "macros", "macro_list" or "macro MACRO_NAME" as
1004 options, provided that Exim is invoked by an admin_user.
1006 6. There is a new option gnutls_compat_mode, when linked against GnuTLS,
1007 which increases compatibility with older clients at the cost of decreased
1008 security. Don't set this unless you need to support such clients.
1010 7. There is a new expansion operator, ${randint:...} which will produce a
1011 "random" number less than the supplied integer. This randomness is
1012 not guaranteed to be cryptographically strong, but depending upon how
1013 Exim was built may be better than the most naive schemes.
1015 8. Exim now explicitly ensures that SHA256 is available when linked against
1018 9. The transport_filter_timeout option now applies to SMTP transports too.
1024 1. Preliminary DKIM support in Experimental.
1030 1. The body_linecount and body_zerocount C variables are now exported in the
1033 2. When a dnslists lookup succeeds, the key that was looked up is now placed
1034 in $dnslist_matched. When the key is an IP address, it is not reversed in
1035 this variable (though it is, of course, in the actual lookup). In simple
1038 deny dnslists = spamhaus.example
1040 the key is also available in another variable (in this case,
1041 $sender_host_address). In more complicated cases, however, this is not
1042 true. For example, using a data lookup might generate a dnslists lookup
1045 deny dnslists = spamhaus.example/<|192.168.1.2|192.168.6.7|...
1047 If this condition succeeds, the value in $dnslist_matched might be
1048 192.168.6.7 (for example).
1050 3. Authenticators now have a client_condition option. When Exim is running as
1051 a client, it skips an authenticator whose client_condition expansion yields
1052 "0", "no", or "false". This can be used, for example, to skip plain text
1053 authenticators when the connection is not encrypted by a setting such as:
1055 client_condition = ${if !eq{$tls_cipher}{}}
1057 Note that the 4.67 documentation states that $tls_cipher contains the
1058 cipher used for incoming messages. In fact, during SMTP delivery, it
1059 contains the cipher used for the delivery. The same is true for
1062 4. There is now a -Mvc <message-id> option, which outputs a copy of the
1063 message to the standard output, in RFC 2822 format. The option can be used
1064 only by an admin user.
1066 5. There is now a /noupdate option for the ratelimit ACL condition. It
1067 computes the rate and checks the limit as normal, but it does not update
1068 the saved data. This means that, in relevant ACLs, it is possible to lookup
1069 the existence of a specified (or auto-generated) ratelimit key without
1070 incrementing the ratelimit counter for that key.
1072 In order for this to be useful, another ACL entry must set the rate
1073 for the same key somewhere (otherwise it will always be zero).
1078 # Read the rate; if it doesn't exist or is below the maximum
1079 # we update it below
1080 deny ratelimit = 100 / 5m / strict / noupdate
1081 log_message = RATE: $sender_rate / $sender_rate_period \
1082 (max $sender_rate_limit)
1084 [... some other logic and tests...]
1086 warn ratelimit = 100 / 5m / strict / per_cmd
1087 log_message = RATE UPDATE: $sender_rate / $sender_rate_period \
1088 (max $sender_rate_limit)
1089 condition = ${if le{$sender_rate}{$sender_rate_limit}}
1093 6. The variable $max_received_linelength contains the number of bytes in the
1094 longest line that was received as part of the message, not counting the
1095 line termination character(s).
1097 7. Host lists can now include +ignore_defer and +include_defer, analogous to
1098 +ignore_unknown and +include_unknown. These options should be used with
1099 care, probably only in non-critical host lists such as whitelists.
1101 8. There's a new option called queue_only_load_latch, which defaults true.
1102 If set false when queue_only_load is greater than zero, Exim re-evaluates
1103 the load for each incoming message in an SMTP session. Otherwise, once one
1104 message is queued, the remainder are also.
1106 9. There is a new ACL, specified by acl_smtp_notquit, which is run in most
1107 cases when an SMTP session ends without sending QUIT. However, when Exim
1108 itself is is bad trouble, such as being unable to write to its log files,
1109 this ACL is not run, because it might try to do things (such as write to
1110 log files) that make the situation even worse.
1112 Like the QUIT ACL, this new ACL is provided to make it possible to gather
1113 statistics. Whatever it returns (accept or deny) is immaterial. The "delay"
1114 modifier is forbidden in this ACL.
1116 When the NOTQUIT ACL is running, the variable $smtp_notquit_reason is set
1117 to a string that indicates the reason for the termination of the SMTP
1118 connection. The possible values are:
1120 acl-drop Another ACL issued a "drop" command
1121 bad-commands Too many unknown or non-mail commands
1122 command-timeout Timeout while reading SMTP commands
1123 connection-lost The SMTP connection has been lost
1124 data-timeout Timeout while reading message data
1125 local-scan-error The local_scan() function crashed
1126 local-scan-timeout The local_scan() function timed out
1127 signal-exit SIGTERM or SIGINT
1128 synchronization-error SMTP synchronization error
1129 tls-failed TLS failed to start
1131 In most cases when an SMTP connection is closed without having received
1132 QUIT, Exim sends an SMTP response message before actually closing the
1133 connection. With the exception of acl-drop, the default message can be
1134 overridden by the "message" modifier in the NOTQUIT ACL. In the case of a
1135 "drop" verb in another ACL, it is the message from the other ACL that is
1138 10. For MySQL and PostgreSQL lookups, it is now possible to specify a list of
1139 servers with individual queries. This is done by starting the query with
1140 "servers=x:y:z;", where each item in the list may take one of two forms:
1142 (1) If it is just a host name, the appropriate global option (mysql_servers
1143 or pgsql_servers) is searched for a host of the same name, and the
1144 remaining parameters (database, user, password) are taken from there.
1146 (2) If it contains any slashes, it is taken as a complete parameter set.
1148 The list of servers is used in exactly the same was as the global list.
1149 Once a connection to a server has happened and a query has been
1150 successfully executed, processing of the lookup ceases.
1152 This feature is intended for use in master/slave situations where updates
1153 are occurring, and one wants to update a master rather than a slave. If the
1154 masters are in the list for reading, you might have:
1156 mysql_servers = slave1/db/name/pw:slave2/db/name/pw:master/db/name/pw
1158 In an updating lookup, you could then write
1160 ${lookup mysql{servers=master; UPDATE ...}
1162 If, on the other hand, the master is not to be used for reading lookups:
1164 pgsql_servers = slave1/db/name/pw:slave2/db/name/pw
1166 you can still update the master by
1168 ${lookup pgsql{servers=master/db/name/pw; UPDATE ...}
1170 11. The message_body_newlines option (default FALSE, for backwards
1171 compatibility) can be used to control whether newlines are present in
1172 $message_body and $message_body_end. If it is FALSE, they are replaced by
1179 1. There is a new log selector called smtp_no_mail, which is not included in
1180 the default setting. When it is set, a line is written to the main log
1181 whenever an accepted SMTP connection terminates without having issued a
1184 2. When an item in a dnslists list is followed by = and & and a list of IP
1185 addresses, the behaviour was not clear when the lookup returned more than
1186 one IP address. This has been solved by the addition of == and =& for "all"
1187 rather than the default "any" matching.
1189 3. Up till now, the only control over which cipher suites GnuTLS uses has been
1190 for the cipher algorithms. New options have been added to allow some of the
1191 other parameters to be varied.
1193 4. There is a new compile-time option called ENABLE_DISABLE_FSYNC. When it is
1194 set, Exim compiles a runtime option called disable_fsync.
1196 5. There is a new variable called $smtp_count_at_connection_start.
1198 6. There's a new control called no_pipelining.
1200 7. There are two new variables called $sending_ip_address and $sending_port.
1201 These are set whenever an SMTP connection to another host has been set up.
1203 8. The expansion of the helo_data option in the smtp transport now happens
1204 after the connection to the server has been made.
1206 9. There is a new expansion operator ${rfc2047d: that decodes strings that
1207 are encoded as per RFC 2047.
1209 10. There is a new log selector called "pid", which causes the current process
1210 id to be added to every log line, in square brackets, immediately after the
1213 11. Exim has been modified so that it flushes SMTP output before implementing
1214 a delay in an ACL. It also flushes the output before performing a callout,
1215 as this can take a substantial time. These behaviours can be disabled by
1216 obeying control = no_delay_flush or control = no_callout_flush,
1217 respectively, at some earlier stage of the connection.
1219 12. There are two new expansion conditions that iterate over a list. They are
1220 called forany and forall.
1222 13. There's a new global option called dsn_from that can be used to vary the
1223 contents of From: lines in bounces and other automatically generated
1224 messages ("delivery status notifications" - hence the name of the option).
1226 14. The smtp transport has a new option called hosts_avoid_pipelining.
1228 15. By default, exigrep does case-insensitive matches. There is now a -I option
1229 that makes it case-sensitive.
1231 16. A number of new features ("addresses", "map", "filter", and "reduce") have
1232 been added to string expansions to make it easier to process lists of
1233 items, typically addresses.
1235 17. There's a new ACL modifier called "continue". It does nothing of itself,
1236 and processing of the ACL always continues with the next condition or
1237 modifier. It is provided so that the side effects of expanding its argument
1240 18. It is now possible to use newline and other control characters (those with
1241 values less than 32, plus DEL) as separators in lists.
1243 19. The exigrep utility now has a -v option, which inverts the matching
1246 20. The host_find_failed option in the manualroute router can now be set to
1253 No new features were added to 4.66.
1259 No new features were added to 4.65.
1265 1. ACL variables can now be given arbitrary names, as long as they start with
1266 "acl_c" or "acl_m" (for connection variables and message variables), are at
1267 least six characters long, with the sixth character being either a digit or
1270 2. There is a new ACL modifier called log_reject_target. It makes it possible
1271 to specify which logs are used for messages about ACL rejections.
1273 3. There is a new authenticator called "dovecot". This is an interface to the
1274 authentication facility of the Dovecot POP/IMAP server, which can support a
1275 number of authentication methods.
1277 4. The variable $message_headers_raw provides a concatenation of all the
1278 messages's headers without any decoding. This is in contrast to
1279 $message_headers, which does RFC2047 decoding on the header contents.
1281 5. In a DNS black list, if two domain names, comma-separated, are given, the
1282 second is used first to do an initial check, making use of any IP value
1283 restrictions that are set. If there is a match, the first domain is used,
1284 without any IP value restrictions, to get the TXT record.
1286 6. All authenticators now have a server_condition option.
1288 7. There is a new command-line option called -Mset. It is useful only in
1289 conjunction with -be (that is, when testing string expansions). It must be
1290 followed by a message id; Exim loads the given message from its spool
1291 before doing the expansions.
1293 8. Another similar new command-line option is called -bem. It operates like
1294 -be except that it must be followed by the name of a file that contains a
1297 9. When an address is delayed because of a 4xx response to a RCPT command, it
1298 is now the combination of sender and recipient that is delayed in
1299 subsequent queue runs until its retry time is reached.
1301 10. Unary negation and the bitwise logical operators and, or, xor, not, and
1302 shift, have been added to the eval: and eval10: expansion items.
1304 11. The variables $interface_address and $interface_port have been renamed
1305 as $received_ip_address and $received_port, to make it clear that they
1306 relate to message reception rather than delivery. (The old names remain
1307 available for compatibility.)
1309 12. The "message" modifier can now be used on "accept" and "discard" acl verbs
1310 to vary the message that is sent when an SMTP command is accepted.
1316 1. There is a new Boolean option called filter_prepend_home for the redirect
1319 2. There is a new acl, set by acl_not_smtp_start, which is run right at the
1320 start of receiving a non-SMTP message, before any of the message has been
1323 3. When an SMTP error message is specified in a "message" modifier in an ACL,
1324 or in a :fail: or :defer: message in a redirect router, Exim now checks the
1325 start of the message for an SMTP error code.
1327 4. There is a new parameter for LDAP lookups called "referrals", which takes
1328 one of the settings "follow" (the default) or "nofollow".
1330 5. Version 20070721.2 of exipick now included, offering these new options:
1332 After all other sorting options have bee processed, reverse order
1333 before displaying messages (-R is synonym).
1335 Randomize order of matching messages before displaying.
1337 Instead of displaying the matching messages, display the sum
1339 --sort <variable>[,<variable>...]
1340 Before displaying matching messages, sort the messages according to
1341 each messages value for each variable.
1343 Negate the value for every test (returns inverse output from the
1344 same criteria without --not).
1350 1. The ${readsocket expansion item now supports Internet domain sockets as well
1351 as Unix domain sockets. If the first argument begins "inet:", it must be of
1352 the form "inet:host:port". The port is mandatory; it may be a number or the
1353 name of a TCP port in /etc/services. The host may be a name, or it may be an
1354 IP address. An ip address may optionally be enclosed in square brackets.
1355 This is best for IPv6 addresses. For example:
1357 ${readsocket{inet:[::1]:1234}{<request data>}...
1359 Only a single host name may be given, but if looking it up yield more than
1360 one IP address, they are each tried in turn until a connection is made. Once
1361 a connection has been made, the behaviour is as for ${readsocket with a Unix
1364 2. If a redirect router sets up file or pipe deliveries for more than one
1365 incoming address, and the relevant transport has batch_max set greater than
1366 one, a batch delivery now occurs.
1368 3. The appendfile transport has a new option called maildirfolder_create_regex.
1369 Its value is a regular expression. For a maildir delivery, this is matched
1370 against the maildir directory; if it matches, Exim ensures that a
1371 maildirfolder file is created alongside the new, cur, and tmp directories.
1377 The documentation is up-to-date for the 4.61 release. Major new features since
1378 the 4.60 release are:
1380 . An option called disable_ipv6, to disable the use of IPv6 completely.
1382 . An increase in the number of ACL variables to 20 of each type.
1384 . A change to use $auth1, $auth2, and $auth3 in authenticators instead of $1,
1385 $2, $3, (though those are still set) because the numeric variables get used
1386 for other things in complicated expansions.
1388 . The default for rfc1413_query_timeout has been changed from 30s to 5s.
1390 . It is possible to use setclassresources() on some BSD OS to control the
1391 resources used in pipe deliveries.
1393 . A new ACL modifier called add_header, which can be used with any verb.
1395 . More errors are detectable in retry rules.
1397 There are a number of other additions too.
1403 The documentation is up-to-date for the 4.60 release. Major new features since
1404 the 4.50 release are:
1406 . Support for SQLite.
1408 . Support for IGNOREQUOTA in LMTP.
1410 . Extensions to the "submission mode" features.
1412 . Support for Client SMTP Authorization (CSA).
1414 . Support for ratelimiting hosts and users.
1416 . New expansion items to help with the BATV "prvs" scheme.
1418 . A "match_ip" condition, that matches an IP address against a list.
1420 There are many more minor changes.