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 CVS before the documentation is updated. Once
7 the documentation is updated, this file is reduced to a short list.
12 1. If built with the EXPERIMENTAL_PROXY feature enabled, Exim can be
13 configured to expect an initial header from a proxy that will make the
14 actual external source IP:host be used in exim instead of the IP of the
15 proxy that is connecting to it.
17 2. When built with OpenSSL the smtp transport now supports options
18 "tls_verify_hosts" and "tls_try_verify_hosts". If either is set the
19 certificate verification is split from the encryption operation. The
20 default remains that a failed verification cancels the encryption.
26 1. New command-line option -bI:sieve will list all supported sieve extensions
27 of this Exim build on standard output, one per line.
28 ManageSieve (RFC 5804) providers managing scripts for use by Exim should
29 query this to establish the correct list to include in the protocol's
30 SIEVE capability line.
32 2. If the -n option is combined with the -bP option, then the name of an
33 emitted option is not output, only the value (if visible to you).
34 For instance, "exim -n -bP pid_file_path" should just emit a pathname
35 followed by a newline, and no other text.
37 3. When built with SUPPORT_TLS and USE_GNUTLS, the SMTP transport driver now
38 has a "tls_dh_min_bits" option, to set the minimum acceptable number of
39 bits in the Diffie-Hellman prime offered by a server (in DH ciphersuites)
40 acceptable for security. (Option accepted but ignored if using OpenSSL).
41 Defaults to 1024, the old value. May be lowered only to 512, or raised as
42 far as you like. Raising this may hinder TLS interoperability with other
43 sites and is not currently recommended. Lowering this will permit you to
44 establish a TLS session which is not as secure as you might like.
46 Unless you really know what you are doing, leave it alone.
48 4. If not built with DISABLE_DNSSEC, Exim now has the main option
49 dns_dnssec_ok; if set to 1 then Exim will initialise the resolver library
50 to send the DO flag to your recursive resolver. If you have a recursive
51 resolver, which can set the Authenticated Data (AD) flag in results, Exim
52 can now detect this. Exim does not perform validation itself, instead
53 relying upon a trusted path to the resolver.
55 Current status: work-in-progress; $sender_host_dnssec variable added.
57 5. DSCP support for outbound connections: on a transport using the smtp driver,
58 set "dscp = ef", for instance, to cause the connections to have the relevant
59 DSCP (IPv4 TOS or IPv6 TCLASS) value in the header.
61 Similarly for inbound connections, there is a new control modifier, dscp,
62 so "warn control = dscp/ef" in the connect ACL, or after authentication.
64 Supported values depend upon system libraries. "exim -bI:dscp" to list the
65 ones Exim knows of. You can also set a raw number 0..0x3F.
67 6. The -G command-line flag is no longer ignored; it is now equivalent to an
68 ACL setting "control = suppress_local_fixups". The -L command-line flag
69 is now accepted and forces use of syslog, with the provided tag as the
70 process name. A few other flags used by Sendmail are now accepted and
73 7. New cutthrough routing feature. Requested by a "control = cutthrough_delivery"
74 ACL modifier; works for single-recipient mails which are recieved on and
75 deliverable via SMTP. Using the connection made for a recipient verify,
76 if requested before the verify, or a new one made for the purpose while
77 the inbound connection is still active. The bulk of the mail item is copied
78 direct from the inbound socket to the outbound (as well as the spool file).
79 When the source notifies the end of data, the data acceptance by the destination
80 is negociated before the acceptance is sent to the source. If the destination
81 does not accept the mail item, for example due to content-scanning, the item
82 is not accepted from the source and therefore there is no need to generate
83 a bounce mail. This is of benefit when providing a secondary-MX service.
84 The downside is that delays are under the control of the ultimate destination
87 The Recieved-by: header on items delivered by cutthrough is generated
88 early in reception rather than at the end; this will affect any timestamp
89 included. The log line showing delivery is recorded before that showing
90 reception; it uses a new ">>" tag instead of "=>".
92 To support the feature, verify-callout connections can now use ESMTP and TLS.
93 The usual smtp transport options are honoured, plus a (new, default everything)
94 hosts_verify_avoid_tls.
96 New variable families named tls_in_cipher, tls_out_cipher etc. are introduced
97 for specific access to the information for each connection. The old names
98 are present for now but deprecated.
100 Not yet supported: IGNOREQUOTA, SIZE, PIPELINING.
102 8. New expansion operators ${listnamed:name} to get the content of a named list
103 and ${listcount:string} to count the items in a list.
105 9. New global option "gnutls_allow_auto_pkcs11", defaults false. The GnuTLS
106 rewrite in 4.80 combines with GnuTLS 2.12.0 or later, to autoload PKCS11
107 modules. For some situations this is desirable, but we expect admin in
108 those situations to know they want the feature. More commonly, it means
109 that GUI user modules get loaded and are broken by the setuid Exim being
110 unable to access files specified in environment variables and passed
111 through, thus breakage. So we explicitly inhibit the PKCS11 initialisation
112 unless this new option is set.
114 Some older OS's with earlier versions of GnuTLS might not have pkcs11 ability,
115 so have also added a build option which can be used to build Exim with GnuTLS
116 but without trying to use any kind of PKCS11 support. Uncomment this in the
119 AVOID_GNUTLS_PKCS11=yes
121 10. The "acl = name" condition on an ACL now supports optional arguments.
122 New expansion item "${acl {name}{arg}...}" and expansion condition
123 "acl {{name}{arg}...}" are added. In all cases up to nine arguments
124 can be used, appearing in $acl_arg1 to $acl_arg9 for the called ACL.
125 Variable $acl_narg contains the number of arguments. If the ACL sets
126 a "message =" value this becomes the result of the expansion item,
127 or the value of $value for the expansion condition. If the ACL returns
128 accept the expansion condition is true; if reject, false. A defer
129 return results in a forced fail.
131 11. Routers and transports can now have multiple headers_add and headers_remove
132 option lines. The concatenated list is used.
134 12. New ACL modifier "remove_header" can remove headers before message gets
135 handled by routers/transports.
137 13. New dnsdb lookup pseudo-type "a+". A sequence of "a6" (if configured),
138 "aaaa" and "a" lookups is done and the full set of results returned.
140 14. New expansion variable $headers_added with content from ACL add_header
141 modifier (but not yet added to messsage).
143 15. New 8bitmime status logging option for received messages. Log field "M8S".
145 16. New authenticated_sender logging option, adding to log field "A".
147 17. New expansion variables $router_name and $transport_name. Useful
148 particularly for debug_print as -bt commandline option does not
149 require privilege whereas -d does.
151 18. If built with EXPERIMENTAL_PRDR, per-recipient data responses per a
152 proposed extension to SMTP from Eric Hall.
154 19. The pipe transport has gained the force_command option, to allow
155 decorating commands from user .forward pipe aliases with prefix
156 wrappers, for instance.
158 20. Callout connections can now AUTH; the same controls as normal delivery
161 21. Support for DMARC, using opendmarc libs, can be enabled. It adds new
162 options: dmarc_forensic_sender, dmarc_history_file, and dmarc_tld_file.
163 It adds new expansion variables $dmarc_ar_header, $dmarc_status,
164 $dmarc_status_text, and $dmarc_used_domain. It adds a new acl modifier
165 dmarc_status. It adds new control flags dmarc_disable_verify and
166 dmarc_enable_forensic.
168 22. Add expansion variable $authenticated_fail_id, which is the username
169 provided to the authentication method which failed. It is available
170 for use in subsequent ACL processing (typically quit or notquit ACLs).
172 23. New ACL modifer "udpsend" can construct a UDP packet to send to a given
175 24. New ${hexquote:..string..} expansion operator converts non-printable
176 characters in the string to \xNN form.
178 25. Experimental TPDA (Transport Post Delivery Action) function added.
179 Patch provided by Axel Rau.
181 26. Experimental Redis lookup added. Patch provided by Warren Baker.
187 1. New authenticator driver, "gsasl". Server-only (at present).
188 This is a SASL interface, licensed under GPL, which can be found at
189 http://www.gnu.org/software/gsasl/.
190 This system does not provide sources of data for authentication, so
191 careful use needs to be made of the conditions in Exim.
193 2. New authenticator driver, "heimdal_gssapi". Server-only.
194 A replacement for using cyrus_sasl with Heimdal, now that $KRB5_KTNAME
195 is no longer honoured for setuid programs by Heimdal. Use the
196 "server_keytab" option to point to the keytab.
198 3. The "pkg-config" system can now be used when building Exim to reference
199 cflags and library information for lookups and authenticators, rather
200 than having to update "CFLAGS", "AUTH_LIBS", "LOOKUP_INCLUDE" and
201 "LOOKUP_LIBS" directly. Similarly for handling the TLS library support
202 without adjusting "TLS_INCLUDE" and "TLS_LIBS".
204 In addition, setting PCRE_CONFIG=yes will query the pcre-config tool to
205 find the headers and libraries for PCRE.
207 4. New expansion variable $tls_bits.
209 5. New lookup type, "dbmjz". Key is an Exim list, the elements of which will
210 be joined together with ASCII NUL characters to construct the key to pass
211 into the DBM library. Can be used with gsasl to access sasldb2 files as
214 6. OpenSSL now supports TLS1.1 and TLS1.2 with OpenSSL 1.0.1.
216 Avoid release 1.0.1a if you can. Note that the default value of
217 "openssl_options" is no longer "+dont_insert_empty_fragments", as that
218 increased susceptibility to attack. This may still have interoperability
219 implications for very old clients (see version 4.31 change 37) but
220 administrators can choose to make the trade-off themselves and restore
221 compatibility at the cost of session security.
223 7. Use of the new expansion variable $tls_sni in the main configuration option
224 tls_certificate will cause Exim to re-expand the option, if the client
225 sends the TLS Server Name Indication extension, to permit choosing a
226 different certificate; tls_privatekey will also be re-expanded. You must
227 still set these options to expand to valid files when $tls_sni is not set.
229 The SMTP Transport has gained the option tls_sni, which will set a hostname
230 for outbound TLS sessions, and set $tls_sni too.
232 A new log_selector, +tls_sni, has been added, to log received SNI values
233 for Exim as a server.
235 8. The existing "accept_8bitmime" option now defaults to true. This means
236 that Exim is deliberately not strictly RFC compliant. We're following
237 Dan Bernstein's advice in http://cr.yp.to/smtp/8bitmime.html by default.
238 Those who disagree, or know that they are talking to mail servers that,
239 even today, are not 8-bit clean, need to turn off this option.
241 9. Exim can now be started with -bw (with an optional timeout, given as
242 -bw<timespec>). With this, stdin at startup is a socket that is
243 already listening for connections. This has a more modern name of
244 "socket activation", but forcing the activated socket to fd 0. We're
245 interested in adding more support for modern variants.
247 10. ${eval } now uses 64-bit values on supporting platforms. A new "G" suffix
248 for numbers indicates multiplication by 1024^3.
250 11. The GnuTLS support has been revamped; the three options gnutls_require_kx,
251 gnutls_require_mac & gnutls_require_protocols are no longer supported.
252 tls_require_ciphers is now parsed by gnutls_priority_init(3) as a priority
253 string, documentation for which is at:
254 http://www.gnutls.org/manual/html_node/Priority-Strings.html
256 SNI support has been added to Exim's GnuTLS integration too.
258 For sufficiently recent GnuTLS libraries, ${randint:..} will now use
259 gnutls_rnd(), asking for GNUTLS_RND_NONCE level randomness.
261 12. With OpenSSL, if built with EXPERIMENTAL_OCSP, a new option tls_ocsp_file
262 is now available. If the contents of the file are valid, then Exim will
263 send that back in response to a TLS status request; this is OCSP Stapling.
264 Exim will not maintain the contents of the file in any way: administrators
265 are responsible for ensuring that it is up-to-date.
267 See "experimental-spec.txt" for more details.
269 13. ${lookup dnsdb{ }} supports now SPF record types. They are handled
270 identically to TXT record lookups.
272 14. New expansion variable $tod_epoch_l for higher-precision time.
274 15. New global option tls_dh_max_bits, defaulting to current value of NSS
275 hard-coded limit of DH ephemeral bits, to fix interop problems caused by
276 GnuTLS 2.12 library recommending a bit count higher than NSS supports.
278 16. tls_dhparam now used by both OpenSSL and GnuTLS, can be path or identifier.
279 Option can now be a path or an identifier for a standard prime.
280 If unset, we use the DH prime from section 2.2 of RFC 5114, "ike23".
281 Set to "historic" to get the old GnuTLS behaviour of auto-generated DH
284 17. SSLv2 now disabled by default in OpenSSL. (Never supported by GnuTLS).
285 Use "openssl_options -no_sslv2" to re-enable support, if your OpenSSL
286 install was not built with OPENSSL_NO_SSL2 ("no-ssl2").
292 1. New options for the ratelimit ACL condition: /count= and /unique=.
293 The /noupdate option has been replaced by a /readonly option.
295 2. The SMTP transport's protocol option may now be set to "smtps", to
296 use SSL-on-connect outbound.
298 3. New variable $av_failed, set true if the AV scanner deferred; ie, when
299 there is a problem talking to the AV scanner, or the AV scanner running.
301 4. New expansion conditions, "inlist" and "inlisti", which take simple lists
302 and check if the search item is a member of the list. This does not
303 support named lists, but does subject the list part to string expansion.
305 5. Unless the new EXPAND_LISTMATCH_RHS build option is set when Exim was
306 built, Exim no longer performs string expansion on the second string of
307 the match_* expansion conditions: "match_address", "match_domain",
308 "match_ip" & "match_local_part". Named lists can still be used.
314 1. The global option "dns_use_edns0" may be set to coerce EDNS0 usage on
315 or off in the resolver library.
321 1. In addition to the existing LDAP and LDAP/SSL ("ldaps") support, there
322 is now LDAP/TLS support, given sufficiently modern OpenLDAP client
323 libraries. The following global options have been added in support of
324 this: ldap_ca_cert_dir, ldap_ca_cert_file, ldap_cert_file, ldap_cert_key,
325 ldap_cipher_suite, ldap_require_cert, ldap_start_tls.
327 2. The pipe transport now takes a boolean option, "freeze_signal", default
328 false. When true, if the external delivery command exits on a signal then
329 Exim will freeze the message in the queue, instead of generating a bounce.
331 3. Log filenames may now use %M as an escape, instead of %D (still available).
332 The %M pattern expands to yyyymm, providing month-level resolution.
334 4. The $message_linecount variable is now updated for the maildir_tag option,
335 in the same way as $message_size, to reflect the real number of lines,
336 including any header additions or removals from transport.
338 5. When contacting a pool of SpamAssassin servers configured in spamd_address,
339 Exim now selects entries randomly, to better scale in a cluster setup.
345 1. SECURITY FIX: privilege escalation flaw fixed. On Linux (and only Linux)
346 the flaw permitted the Exim run-time user to cause root to append to
347 arbitrary files of the attacker's choosing, with the content based
348 on content supplied by the attacker.
350 2. Exim now supports loading some lookup types at run-time, using your
351 platform's dlopen() functionality. This has limited platform support
352 and the intention is not to support every variant, it's limited to
353 dlopen(). This permits the main Exim binary to not be linked against
354 all the libraries needed for all the lookup types.
360 NOTE: this version is not guaranteed backwards-compatible, please read the
361 items below carefully
363 1. A new main configuration option, "openssl_options", is available if Exim
364 is built with SSL support provided by OpenSSL. The option allows
365 administrators to specify OpenSSL options to be used on connections;
366 typically this is to set bug compatibility features which the OpenSSL
367 developers have not enabled by default. There may be security
368 consequences for certain options, so these should not be changed
371 2. A new pipe transport option, "permit_coredumps", may help with problem
372 diagnosis in some scenarios. Note that Exim is typically installed as
373 a setuid binary, which on most OSes will inhibit coredumps by default,
374 so that safety mechanism would have to be overridden for this option to
375 be able to take effect.
377 3. ClamAV 0.95 is now required for ClamAV support in Exim, unless
378 Local/Makefile sets: WITH_OLD_CLAMAV_STREAM=yes
379 Note that this switches Exim to use a new API ("INSTREAM") and a future
380 release of ClamAV will remove support for the old API ("STREAM").
382 The av_scanner option, when set to "clamd", now takes an optional third
383 part, "local", which causes Exim to pass a filename to ClamAV instead of
384 the file content. This is the same behaviour as when clamd is pointed at
385 a Unix-domain socket. For example:
387 av_scanner = clamd:192.0.2.3 1234:local
389 ClamAV's ExtendedDetectionInfo response format is now handled.
391 4. There is now a -bmalware option, restricted to admin users. This option
392 takes one parameter, a filename, and scans that file with Exim's
393 malware-scanning framework. This is intended purely as a debugging aid
394 to ensure that Exim's scanning is working, not to replace other tools.
395 Note that the ACL framework is not invoked, so if av_scanner references
396 ACL variables without a fallback then this will fail.
398 5. There is a new expansion operator, "reverse_ip", which will reverse IP
399 addresses; IPv4 into dotted quad, IPv6 into dotted nibble. Examples:
401 ${reverse_ip:192.0.2.4}
403 ${reverse_ip:2001:0db8:c42:9:1:abcd:192.0.2.3}
404 -> 3.0.2.0.0.0.0.c.d.c.b.a.1.0.0.0.9.0.0.0.2.4.c.0.8.b.d.0.1.0.0.2
406 6. There is a new ACL control called "debug", to enable debug logging.
407 This allows selective logging of certain incoming transactions within
408 production environments, with some care. It takes two options, "tag"
409 and "opts"; "tag" is included in the filename of the log and "opts"
410 is used as per the -d<options> command-line option. Examples, which
411 don't all make sense in all contexts:
414 control = debug/tag=.$sender_host_address
415 control = debug/opts=+expand+acl
416 control = debug/tag=.$message_exim_id/opts=+expand
418 7. It has always been implicit in the design and the documentation that
419 "the Exim user" is not root. src/EDITME said that using root was
420 "very strongly discouraged". This is not enough to keep people from
421 shooting themselves in the foot in days when many don't configure Exim
422 themselves but via package build managers. The security consequences of
423 running various bits of network code are severe if there should be bugs in
424 them. As such, the Exim user may no longer be root. If configured
425 statically, Exim will refuse to build. If configured as ref:user then Exim
426 will exit shortly after start-up. If you must shoot yourself in the foot,
427 then henceforth you will have to maintain your own local patches to strip
430 8. There is a new expansion condition, bool_lax{}. Where bool{} uses the ACL
431 condition logic to determine truth/failure and will fail to expand many
432 strings, bool_lax{} uses the router condition logic, where most strings
434 Note: bool{00} is false, bool_lax{00} is true.
436 9. Routers now support multiple "condition" tests.
438 10. There is now a runtime configuration option "tcp_wrappers_daemon_name".
439 Setting this allows an admin to define which entry in the tcpwrappers
440 config file will be used to control access to the daemon. This option
441 is only available when Exim is built with USE_TCP_WRAPPERS. The
442 default value is set at build time using the TCP_WRAPPERS_DAEMON_NAME
445 11. [POSSIBLE CONFIG BREAKAGE] The default value for system_filter_user is now
446 the Exim run-time user, instead of root.
448 12. [POSSIBLE CONFIG BREAKAGE] ALT_CONFIG_ROOT_ONLY is no longer optional and
449 is forced on. This is mitigated by the new build option
450 TRUSTED_CONFIG_LIST which defines a list of configuration files which
451 are trusted; one per line. If a config file is owned by root and matches
452 a pathname in the list, then it may be invoked by the Exim build-time
453 user without Exim relinquishing root privileges.
455 13. [POSSIBLE CONFIG BREAKAGE] The Exim user is no longer automatically
456 trusted to supply -D<Macro[=Value]> overrides on the command-line. Going
457 forward, we recommend using TRUSTED_CONFIG_LIST with shim configs that
458 include the main config. As a transition mechanism, we are temporarily
459 providing a work-around: the new build option WHITELIST_D_MACROS provides
460 a colon-separated list of macro names which may be overridden by the Exim
461 run-time user. The values of these macros are constrained to the regex
462 ^[A-Za-z0-9_/.-]*$ (which explicitly does allow for empty values).
468 1. TWO SECURITY FIXES: one relating to mail-spools which are globally
469 writable, the other to locking of MBX folders (not mbox).
471 2. MySQL stored procedures are now supported.
473 3. The dkim_domain transport option is now a list, not a single string, and
474 messages will be signed for each element in the list (discarding
477 4. The 4.70 release unexpectedly changed the behaviour of dnsdb TXT lookups
478 in the presence of multiple character strings within the RR. Prior to 4.70,
479 only the first string would be returned. The dnsdb lookup now, by default,
480 preserves the pre-4.70 semantics, but also now takes an extended output
481 separator specification. The separator can be followed by a semicolon, to
482 concatenate the individual text strings together with no join character,
483 or by a comma and a second separator character, in which case the text
484 strings within a TXT record are joined on that second character.
485 Administrators are reminded that DNS provides no ordering guarantees
486 between multiple records in an RRset. For example:
488 foo.example. IN TXT "a" "b" "c"
489 foo.example. IN TXT "d" "e" "f"
491 ${lookup dnsdb{>/ txt=foo.example}} -> "a/d"
492 ${lookup dnsdb{>/; txt=foo.example}} -> "def/abc"
493 ${lookup dnsdb{>/,+ txt=foo.example}} -> "a+b+c/d+e+f"
499 1. Native DKIM support without an external library.
500 (Note that if no action to prevent it is taken, a straight upgrade will
501 result in DKIM verification of all signed incoming emails. See spec
502 for details on conditionally disabling)
504 2. Experimental DCC support via dccifd (contributed by Wolfgang Breyha).
506 3. There is now a bool{} expansion condition which maps certain strings to
507 true/false condition values (most likely of use in conjunction with the
508 and{} expansion operator).
510 4. The $spam_score, $spam_bar and $spam_report variables are now available
513 5. exim -bP now supports "macros", "macro_list" or "macro MACRO_NAME" as
514 options, provided that Exim is invoked by an admin_user.
516 6. There is a new option gnutls_compat_mode, when linked against GnuTLS,
517 which increases compatibility with older clients at the cost of decreased
518 security. Don't set this unless you need to support such clients.
520 7. There is a new expansion operator, ${randint:...} which will produce a
521 "random" number less than the supplied integer. This randomness is
522 not guaranteed to be cryptographically strong, but depending upon how
523 Exim was built may be better than the most naive schemes.
525 8. Exim now explicitly ensures that SHA256 is available when linked against
528 9. The transport_filter_timeout option now applies to SMTP transports too.
534 1. Preliminary DKIM support in Experimental.
540 1. The body_linecount and body_zerocount C variables are now exported in the
543 2. When a dnslists lookup succeeds, the key that was looked up is now placed
544 in $dnslist_matched. When the key is an IP address, it is not reversed in
545 this variable (though it is, of course, in the actual lookup). In simple
548 deny dnslists = spamhaus.example
550 the key is also available in another variable (in this case,
551 $sender_host_address). In more complicated cases, however, this is not
552 true. For example, using a data lookup might generate a dnslists lookup
555 deny dnslists = spamhaus.example/<|192.168.1.2|192.168.6.7|...
557 If this condition succeeds, the value in $dnslist_matched might be
558 192.168.6.7 (for example).
560 3. Authenticators now have a client_condition option. When Exim is running as
561 a client, it skips an authenticator whose client_condition expansion yields
562 "0", "no", or "false". This can be used, for example, to skip plain text
563 authenticators when the connection is not encrypted by a setting such as:
565 client_condition = ${if !eq{$tls_cipher}{}}
567 Note that the 4.67 documentation states that $tls_cipher contains the
568 cipher used for incoming messages. In fact, during SMTP delivery, it
569 contains the cipher used for the delivery. The same is true for
572 4. There is now a -Mvc <message-id> option, which outputs a copy of the
573 message to the standard output, in RFC 2822 format. The option can be used
574 only by an admin user.
576 5. There is now a /noupdate option for the ratelimit ACL condition. It
577 computes the rate and checks the limit as normal, but it does not update
578 the saved data. This means that, in relevant ACLs, it is possible to lookup
579 the existence of a specified (or auto-generated) ratelimit key without
580 incrementing the ratelimit counter for that key.
582 In order for this to be useful, another ACL entry must set the rate
583 for the same key somewhere (otherwise it will always be zero).
588 # Read the rate; if it doesn't exist or is below the maximum
590 deny ratelimit = 100 / 5m / strict / noupdate
591 log_message = RATE: $sender_rate / $sender_rate_period \
592 (max $sender_rate_limit)
594 [... some other logic and tests...]
596 warn ratelimit = 100 / 5m / strict / per_cmd
597 log_message = RATE UPDATE: $sender_rate / $sender_rate_period \
598 (max $sender_rate_limit)
599 condition = ${if le{$sender_rate}{$sender_rate_limit}}
603 6. The variable $max_received_linelength contains the number of bytes in the
604 longest line that was received as part of the message, not counting the
605 line termination character(s).
607 7. Host lists can now include +ignore_defer and +include_defer, analagous to
608 +ignore_unknown and +include_unknown. These options should be used with
609 care, probably only in non-critical host lists such as whitelists.
611 8. There's a new option called queue_only_load_latch, which defaults true.
612 If set false when queue_only_load is greater than zero, Exim re-evaluates
613 the load for each incoming message in an SMTP session. Otherwise, once one
614 message is queued, the remainder are also.
616 9. There is a new ACL, specified by acl_smtp_notquit, which is run in most
617 cases when an SMTP session ends without sending QUIT. However, when Exim
618 itself is is bad trouble, such as being unable to write to its log files,
619 this ACL is not run, because it might try to do things (such as write to
620 log files) that make the situation even worse.
622 Like the QUIT ACL, this new ACL is provided to make it possible to gather
623 statistics. Whatever it returns (accept or deny) is immaterial. The "delay"
624 modifier is forbidden in this ACL.
626 When the NOTQUIT ACL is running, the variable $smtp_notquit_reason is set
627 to a string that indicates the reason for the termination of the SMTP
628 connection. The possible values are:
630 acl-drop Another ACL issued a "drop" command
631 bad-commands Too many unknown or non-mail commands
632 command-timeout Timeout while reading SMTP commands
633 connection-lost The SMTP connection has been lost
634 data-timeout Timeout while reading message data
635 local-scan-error The local_scan() function crashed
636 local-scan-timeout The local_scan() function timed out
637 signal-exit SIGTERM or SIGINT
638 synchronization-error SMTP synchronization error
639 tls-failed TLS failed to start
641 In most cases when an SMTP connection is closed without having received
642 QUIT, Exim sends an SMTP response message before actually closing the
643 connection. With the exception of acl-drop, the default message can be
644 overridden by the "message" modifier in the NOTQUIT ACL. In the case of a
645 "drop" verb in another ACL, it is the message from the other ACL that is
648 10. For MySQL and PostgreSQL lookups, it is now possible to specify a list of
649 servers with individual queries. This is done by starting the query with
650 "servers=x:y:z;", where each item in the list may take one of two forms:
652 (1) If it is just a host name, the appropriate global option (mysql_servers
653 or pgsql_servers) is searched for a host of the same name, and the
654 remaining parameters (database, user, password) are taken from there.
656 (2) If it contains any slashes, it is taken as a complete parameter set.
658 The list of servers is used in exactly the same was as the global list.
659 Once a connection to a server has happened and a query has been
660 successfully executed, processing of the lookup ceases.
662 This feature is intended for use in master/slave situations where updates
663 are occurring, and one wants to update a master rather than a slave. If the
664 masters are in the list for reading, you might have:
666 mysql_servers = slave1/db/name/pw:slave2/db/name/pw:master/db/name/pw
668 In an updating lookup, you could then write
670 ${lookup mysql{servers=master; UPDATE ...}
672 If, on the other hand, the master is not to be used for reading lookups:
674 pgsql_servers = slave1/db/name/pw:slave2/db/name/pw
676 you can still update the master by
678 ${lookup pgsql{servers=master/db/name/pw; UPDATE ...}
680 11. The message_body_newlines option (default FALSE, for backwards
681 compatibility) can be used to control whether newlines are present in
682 $message_body and $message_body_end. If it is FALSE, they are replaced by
689 1. There is a new log selector called smtp_no_mail, which is not included in
690 the default setting. When it is set, a line is written to the main log
691 whenever an accepted SMTP connection terminates without having issued a
694 2. When an item in a dnslists list is followed by = and & and a list of IP
695 addresses, the behaviour was not clear when the lookup returned more than
696 one IP address. This has been solved by the addition of == and =& for "all"
697 rather than the default "any" matching.
699 3. Up till now, the only control over which cipher suites GnuTLS uses has been
700 for the cipher algorithms. New options have been added to allow some of the
701 other parameters to be varied.
703 4. There is a new compile-time option called ENABLE_DISABLE_FSYNC. When it is
704 set, Exim compiles a runtime option called disable_fsync.
706 5. There is a new variable called $smtp_count_at_connection_start.
708 6. There's a new control called no_pipelining.
710 7. There are two new variables called $sending_ip_address and $sending_port.
711 These are set whenever an SMTP connection to another host has been set up.
713 8. The expansion of the helo_data option in the smtp transport now happens
714 after the connection to the server has been made.
716 9. There is a new expansion operator ${rfc2047d: that decodes strings that
717 are encoded as per RFC 2047.
719 10. There is a new log selector called "pid", which causes the current process
720 id to be added to every log line, in square brackets, immediately after the
723 11. Exim has been modified so that it flushes SMTP output before implementing
724 a delay in an ACL. It also flushes the output before performing a callout,
725 as this can take a substantial time. These behaviours can be disabled by
726 obeying control = no_delay_flush or control = no_callout_flush,
727 respectively, at some earlier stage of the connection.
729 12. There are two new expansion conditions that iterate over a list. They are
730 called forany and forall.
732 13. There's a new global option called dsn_from that can be used to vary the
733 contents of From: lines in bounces and other automatically generated
734 messages ("delivery status notifications" - hence the name of the option).
736 14. The smtp transport has a new option called hosts_avoid_pipelining.
738 15. By default, exigrep does case-insensitive matches. There is now a -I option
739 that makes it case-sensitive.
741 16. A number of new features ("addresses", "map", "filter", and "reduce") have
742 been added to string expansions to make it easier to process lists of
743 items, typically addresses.
745 17. There's a new ACL modifier called "continue". It does nothing of itself,
746 and processing of the ACL always continues with the next condition or
747 modifier. It is provided so that the side effects of expanding its argument
750 18. It is now possible to use newline and other control characters (those with
751 values less than 32, plus DEL) as separators in lists.
753 19. The exigrep utility now has a -v option, which inverts the matching
756 20. The host_find_failed option in the manualroute router can now be set to
763 No new features were added to 4.66.
769 No new features were added to 4.65.
775 1. ACL variables can now be given arbitrary names, as long as they start with
776 "acl_c" or "acl_m" (for connection variables and message variables), are at
777 least six characters long, with the sixth character being either a digit or
780 2. There is a new ACL modifier called log_reject_target. It makes it possible
781 to specify which logs are used for messages about ACL rejections.
783 3. There is a new authenticator called "dovecot". This is an interface to the
784 authentication facility of the Dovecot POP/IMAP server, which can support a
785 number of authentication methods.
787 4. The variable $message_headers_raw provides a concatenation of all the
788 messages's headers without any decoding. This is in contrast to
789 $message_headers, which does RFC2047 decoding on the header contents.
791 5. In a DNS black list, if two domain names, comma-separated, are given, the
792 second is used first to do an initial check, making use of any IP value
793 restrictions that are set. If there is a match, the first domain is used,
794 without any IP value restrictions, to get the TXT record.
796 6. All authenticators now have a server_condition option.
798 7. There is a new command-line option called -Mset. It is useful only in
799 conjunction with -be (that is, when testing string expansions). It must be
800 followed by a message id; Exim loads the given message from its spool
801 before doing the expansions.
803 8. Another similar new command-line option is called -bem. It operates like
804 -be except that it must be followed by the name of a file that contains a
807 9. When an address is delayed because of a 4xx response to a RCPT command, it
808 is now the combination of sender and recipient that is delayed in
809 subsequent queue runs until its retry time is reached.
811 10. Unary negation and the bitwise logical operators and, or, xor, not, and
812 shift, have been added to the eval: and eval10: expansion items.
814 11. The variables $interface_address and $interface_port have been renamed
815 as $received_ip_address and $received_port, to make it clear that they
816 relate to message reception rather than delivery. (The old names remain
817 available for compatibility.)
819 12. The "message" modifier can now be used on "accept" and "discard" acl verbs
820 to vary the message that is sent when an SMTP command is accepted.
826 1. There is a new Boolean option called filter_prepend_home for the redirect
829 2. There is a new acl, set by acl_not_smtp_start, which is run right at the
830 start of receiving a non-SMTP message, before any of the message has been
833 3. When an SMTP error message is specified in a "message" modifier in an ACL,
834 or in a :fail: or :defer: message in a redirect router, Exim now checks the
835 start of the message for an SMTP error code.
837 4. There is a new parameter for LDAP lookups called "referrals", which takes
838 one of the settings "follow" (the default) or "nofollow".
840 5. Version 20070721.2 of exipick now included, offering these new options:
842 After all other sorting options have bee processed, reverse order
843 before displaying messages (-R is synonym).
845 Randomize order of matching messages before displaying.
847 Instead of displaying the matching messages, display the sum
849 --sort <variable>[,<variable>...]
850 Before displaying matching messages, sort the messages according to
851 each messages value for each variable.
853 Negate the value for every test (returns inverse output from the
854 same criteria without --not).
860 1. The ${readsocket expansion item now supports Internet domain sockets as well
861 as Unix domain sockets. If the first argument begins "inet:", it must be of
862 the form "inet:host:port". The port is mandatory; it may be a number or the
863 name of a TCP port in /etc/services. The host may be a name, or it may be an
864 IP address. An ip address may optionally be enclosed in square brackets.
865 This is best for IPv6 addresses. For example:
867 ${readsocket{inet:[::1]:1234}{<request data>}...
869 Only a single host name may be given, but if looking it up yield more than
870 one IP address, they are each tried in turn until a connection is made. Once
871 a connection has been made, the behaviour is as for ${readsocket with a Unix
874 2. If a redirect router sets up file or pipe deliveries for more than one
875 incoming address, and the relevant transport has batch_max set greater than
876 one, a batch delivery now occurs.
878 3. The appendfile transport has a new option called maildirfolder_create_regex.
879 Its value is a regular expression. For a maildir delivery, this is matched
880 against the maildir directory; if it matches, Exim ensures that a
881 maildirfolder file is created alongside the new, cur, and tmp directories.
887 The documentation is up-to-date for the 4.61 release. Major new features since
888 the 4.60 release are:
890 . An option called disable_ipv6, to disable the use of IPv6 completely.
892 . An increase in the number of ACL variables to 20 of each type.
894 . A change to use $auth1, $auth2, and $auth3 in authenticators instead of $1,
895 $2, $3, (though those are still set) because the numeric variables get used
896 for other things in complicated expansions.
898 . The default for rfc1413_query_timeout has been changed from 30s to 5s.
900 . It is possible to use setclassresources() on some BSD OS to control the
901 resources used in pipe deliveries.
903 . A new ACL modifier called add_header, which can be used with any verb.
905 . More errors are detectable in retry rules.
907 There are a number of other additions too.
913 The documentation is up-to-date for the 4.60 release. Major new features since
914 the 4.50 release are:
916 . Support for SQLite.
918 . Support for IGNOREQUOTA in LMTP.
920 . Extensions to the "submission mode" features.
922 . Support for Client SMTP Authorization (CSA).
924 . Support for ratelimiting hosts and users.
926 . New expansion items to help with the BATV "prvs" scheme.
928 . A "match_ip" condition, that matches an IP address against a list.
930 There are many more minor changes.
projects / exim.git / blob