Commit | Line | Data |
---|---|---|
495ae4b0 PH |
1 | New Features in Exim |
2 | -------------------- | |
3 | ||
38a0a95f PH |
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 | |
33f316f2 | 6 | test from the snapshots or the Git before the documentation is updated. Once |
38a0a95f PH |
7 | the documentation is updated, this file is reduced to a short list. |
8 | ||
d99f54e4 JH |
9 | Version 4.92 |
10 | -------------- | |
11 | ||
bce15b62 JH |
12 | 1. ${l_header:<name>} and ${l_h:<name>} expansion items, giving a colon-sep |
13 | list when there are multiple headers having a given name. This matters | |
14 | when individual headers are wrapped onto multiple lines; with previous | |
15 | facilities hard to parse. | |
16 | ||
afdb5e9c JH |
17 | 2. The ${readsocket } expansion item now takes a "tls" option, doing the |
18 | obvious thing. | |
19 | ||
8ac90765 JH |
20 | 3. EXPERIMENTAL_REQUIRETLS. See the experimental.spec file. |
21 | ||
71c15846 JH |
22 | 4. If built with SUPPORT_I18N a "utf8_downconvert" option on the smtp transport. |
23 | ||
d4fd1b83 | 24 | Version 4.91 |
47195144 JH |
25 | -------------- |
26 | ||
27 | 1. Dual-certificate stacks on servers now support OCSP stapling, under GnuTLS | |
28 | version 3.5.6 or later. | |
29 | ||
c0635b6d JH |
30 | 2. DANE is now supported under GnuTLS version 3.0.0 or later. Both GnuTLS and |
31 | OpenSSL versions are moved to mainline support from Experimental. | |
405074ad | 32 | New SMTP transport option "dane_require_tls_ciphers". |
899b8bbc | 33 | |
c11d665d JH |
34 | 3. Feature macros for the compiled-in set of malware scanner interfaces. |
35 | ||
7952eef9 JH |
36 | 4. SPF support is promoted from Experimental to mainline status. The template |
37 | src/EDITME makefile does not enable its inclusion. | |
38 | ||
306c6c77 | 39 | 5. Logging control for DKIM verification. The existing DKIM log line is |
2c47372f JH |
40 | controlled by a "dkim_verbose" selector which is _not_ enabled by default. |
41 | A new tag "DKIM=<domain>" is added to <= lines by default, controlled by | |
42 | a "dkim" log_selector. | |
43 | ||
306c6c77 JH |
44 | 6. Receive duration on <= lines, under a new log_selector "receive_time". |
45 | ||
66387a73 JH |
46 | 7. Options "ipv4_only" and "ipv4_prefer" on the dnslookup router and on |
47 | routing rules in the manualroute router. | |
48 | ||
9c29c48f JH |
49 | 8. Expansion item ${sha3:<string>} / ${sha3_<N>:<string>} now also supported |
50 | under OpenSSL version 1.1.1 or later. | |
51 | ||
286b9d5f | 52 | 9. DKIM operations can now use the Ed25519 algorithm in addition to RSA, under |
cb78c1a8 | 53 | GnuTLS 3.6.0 or OpenSSL 1.1.1 or later. |
286b9d5f | 54 | |
260958d6 JH |
55 | 10. Builtin feature-macros _CRYPTO_HASH_SHA3 and _CRYPTO_SIGN_ED25519, library |
56 | version dependent. | |
57 | ||
2be324ee JH |
58 | 11. "exim -bP macro <name>" returns caller-usable status. |
59 | ||
dfbcb5ac JH |
60 | 12. Expansion item ${authresults {<machine>}} for creating an |
61 | Authentication-Results: header. | |
62 | ||
617d3932 | 63 | 13. EXPERIMENTAL_ARC. See the experimental.spec file. |
ddd16464 | 64 | See also new util/renew-opendmarc-tlds.sh script for use with DMARC/ARC. |
617d3932 | 65 | |
c4b57fdd JH |
66 | 14: A dane:fail event, intended to facilitate reporting. |
67 | ||
07e347ab GF |
68 | 15. "Lightweight" support for Redis Cluster. Requires redis_servers list to |
69 | contain all the servers in the cluster, all of which must be reachable from | |
70 | the running exim instance. If the cluster has master/slave replication, the | |
71 | list must contain all the master and slave servers. | |
72 | ||
eb445b04 HSHR |
73 | 16. Add an option to the Avast scanner interface: "pass_unscanned". This |
74 | allows to treat unscanned files as clean. Files may be unscanned for | |
75 | several reasons: decompression bombs, broken archives. | |
76 | ||
47195144 | 77 | |
856d1e16 PP |
78 | Version 4.90 |
79 | ------------ | |
80 | ||
81 | 1. PKG_CONFIG_PATH can now be set in Local/Makefile; | |
82 | wildcards will be expanded, values are collapsed. | |
83 | ||
8de9db65 JH |
84 | 2. The ${readsocket } expansion now takes an option to not shutdown the |
85 | connection after sending the query string. The default remains to do so. | |
86 | ||
875512a3 JH |
87 | 3. An smtp transport option "hosts_noproxy_tls" to control whether multiple |
88 | deliveries on a single TCP connection can maintain a TLS connection | |
89 | open. By default disabled for all hosts, doing so saves the cost of | |
90 | making new TLS sessions, at the cost of having to proxy the data via | |
91 | another process. Logging is also affected. | |
92 | ||
71b32d41 ACK |
93 | 4. A malware connection type for the FPSCAND protocol. |
94 | ||
57cc2785 JH |
95 | 5. An option for recipient verify callouts to hold the connection open for |
96 | further recipients and for delivery. | |
97 | ||
6e411084 PP |
98 | 6. The reproducible build $SOURCE_DATE_EPOCH environment variable is now |
99 | supported. | |
100 | ||
328c5688 JH |
101 | 7. Optionally, an alternate format for spool data-files which matches the |
102 | wire format - meaning more efficient reception and transmission (at the | |
103 | cost of difficulty with standard Unix tools). Only used for messages | |
104 | received using the ESMTP CHUNKING option, and when a new main-section | |
105 | option "spool_wireformat" (false by default) is set. | |
106 | ||
f33875c3 PP |
107 | 8. New main configuration option "commandline_checks_require_admin" to |
108 | restrict who can use various introspection options. | |
109 | ||
d291c767 HSHR |
110 | 9. New option modifier "no_check" for quota and quota_filecount |
111 | appendfile transport. | |
112 | ||
a09f2942 JH |
113 | 10. Variable $smtp_command_history returning a comma-sep list of recent |
114 | SMTP commands. | |
115 | ||
0f1a8658 JH |
116 | 11. Millisecond timetamps in logs, on log_selector "millisec". Also affects |
117 | log elements QT, DT and D, and timstamps in debug output. | |
571b2715 | 118 | |
a2673768 JH |
119 | 12. TCP Fast Open logging. As a server, logs when the SMTP banner was sent |
120 | while still in SYN_RECV state; as a client logs when the connection | |
4a5cbaff | 121 | is opened with a TFO cookie. |
a2673768 | 122 | |
9e70917d | 123 | 13. DKIM support for multiple signing, by domain and/or key-selector. |
7c6ec81b | 124 | DKIM support for multiple hashes, and for alternate-identity tags. |
970424a5 | 125 | Builtin macro with default list of signed headers. |
484cc1a9 | 126 | Better syntax for specifying oversigning. |
cc55f420 JH |
127 | The DKIM ACL can override verification status, and status is visible in |
128 | the data ACL. | |
d73e45df | 129 | |
c4d5e329 HSHR |
130 | 14. Exipick understands -C|--config for an alternative Exim |
131 | configuration file. | |
132 | ||
4a5cbaff JH |
133 | 15. TCP Fast Open used, with data-on-SYN, for client SMTP via SOCKS5 proxy, |
134 | for ${readsocket } expansions, and for ClamAV. | |
135 | ||
9650d98a JH |
136 | 16. The "-be" expansion test mode now supports macros. Macros are expanded |
137 | in test lines, and new macros can be defined. | |
138 | ||
ba86e143 JH |
139 | 17. Support for server-side dual-certificate-stacks (eg. RSA + ECDSA). |
140 | ||
856d1e16 | 141 | |
fd047340 JH |
142 | Version 4.89 |
143 | ------------ | |
144 | ||
33f316f2 HSHR |
145 | 1. Allow relative config file names for ".include" |
146 | ||
64073d9c JH |
147 | 2. A main-section config option "debug_store" to control the checks on |
148 | variable locations during store-reset. Normally false but can be enabled | |
149 | when a memory corrution issue is suspected on a production system. | |
150 | ||
fd047340 | 151 | |
8d042305 JH |
152 | Version 4.88 |
153 | ------------ | |
154 | ||
fc16abb4 | 155 | 1. The new perl_taintmode option allows to run the embedded perl |
2f680c0c HSHR |
156 | interpreter in taint mode. |
157 | ||
fc16abb4 JH |
158 | 2. New log_selector: dnssec, adds a "DS" tag to acceptance and delivery lines. |
159 | ||
b0d68adc JH |
160 | 3. Speculative debugging, via a "kill" option to the "control=debug" ACL |
161 | modifier. | |
162 | ||
6e773413 JH |
163 | 4. New expansion item ${sha3:<string>} / ${sha3_<N>:<string>}. |
164 | N can be 224, 256 (default), 384, 512. | |
165 | With GnuTLS 3.5.0 or later, only. | |
166 | ||
f59aaaaa | 167 | 5. Facility for named queues: A command-line argument can specify |
55e70e76 | 168 | the queue name for a queue operation, and an ACL modifier can set |
0cd5fd23 JH |
169 | the queue to be used for a message. A $queue_name variable gives |
170 | visibility. | |
28b3821f | 171 | |
03ca21f8 JH |
172 | 6. New expansion operators base32/base32d. |
173 | ||
44bc8f0c | 174 | 7. The CHUNKING ESMTP extension from RFC 3030. May give some slight |
7e3ce68e | 175 | performance increase and network load decrease. Main config option |
15021e11 JH |
176 | chunking_advertise_hosts, and smtp transport option hosts_try_chunking |
177 | for control. | |
7e3ce68e | 178 | |
5bde3efa ACK |
179 | 8. LMDB lookup support, as Experimental. Patch supplied by Andrew Colin Kissa. |
180 | ||
3367f8c2 JH |
181 | 9. Expansion operator escape8bit, like escape but not touching newline etc.. |
182 | ||
fbbd45ff | 183 | 10. Feature macros, generated from compile options. All start with "_HAVE_" |
4945f557 | 184 | and go on with some roughly recognisable name. Driver macros, for |
383832ef | 185 | router, transport and authentication drivers; names starting with "_DRIVER_". |
4945f557 JH |
186 | Option macros, for each configuration-file option; all start with "_OPT_". |
187 | Use the "-bP macros" command-line option to see what is present. | |
fbbd45ff | 188 | |
dcb72db9 JH |
189 | 11. Integer values for options can take a "G" multiplier. |
190 | ||
ff5929e3 JH |
191 | 12. defer=pass option for the ACL control cutthrough_delivery, to reflect 4xx |
192 | returns from the target back to the initiator, rather than spooling the | |
193 | message. | |
194 | ||
317e40ac PP |
195 | 13. New built-in constants available for tls_dhparam and default changed. |
196 | ||
3369a853 ACK |
197 | 14. If built with EXPERIMENTAL_QUEUEFILE, a queuefile transport, for writing |
198 | out copies of the message spool files for use by 3rd-party scanners. | |
199 | ||
fb05276a JH |
200 | 15. A new option on the smtp transport, hosts_try_fastopen. If the system |
201 | supports it (on Linux it must be enabled in the kernel by the sysadmin) | |
202 | try to use RFC 7413 "TCP Fast Open". No data is sent on the SYN segment | |
203 | but it permits a peer that also supports the facility to send its SMTP | |
204 | banner immediately after the SYN,ACK segment rather then waiting for | |
205 | another ACK - so saving up to one roundtrip time. Because it requires | |
206 | previous communication with the peer (we save a cookie from it) this | |
f59aaaaa | 207 | will only become active on frequently-contacted destinations. |
fb05276a | 208 | |
446415f5 HSHR |
209 | 16. A new syslog_pid option to suppress PID duplication in syslog lines. |
210 | ||
8d042305 | 211 | |
0d9b78be JH |
212 | Version 4.87 |
213 | ------------ | |
214 | ||
f38917cc JH |
215 | 1. The ACL conditions regex and mime_regex now capture substrings |
216 | into numeric variables $regex1 to 9, like the "match" expansion condition. | |
217 | ||
055e2cb4 JH |
218 | 2. New $callout_address variable records the address used for a spam=, |
219 | malware= or verify= callout. | |
220 | ||
fa41615d JH |
221 | 3. Transports now take a "max_parallel" option, to limit concurrency. |
222 | ||
fc4a7f70 JH |
223 | 4. Expansion operators ${ipv6norm:<string>} and ${ipv6denorm:<string>}. |
224 | The latter expands to a 8-element colon-sep set of hex digits including | |
225 | leading zeroes. A trailing ipv4-style dotted-decimal set is converted | |
226 | to hex. Pure ipv4 addresses are converted to IPv4-mapped IPv6. | |
227 | The former operator strips leading zeroes and collapses the longest | |
228 | set of 0-groups to a double-colon. | |
229 | ||
240c288f JH |
230 | 5. New "-bP config" support, to dump the effective configuration. |
231 | ||
abe1010c JH |
232 | 6. New $dkim_key_length variable. |
233 | ||
9aa35e9c | 234 | 7. New base64d and base64 expansion items (the existing str2b64 being a |
59b87190 | 235 | synonym of the latter). Add support in base64 for certificates. |
9aa35e9c | 236 | |
62b7cd08 | 237 | 8. New main configuration option "bounce_return_linesize_limit" to |
f59aaaaa | 238 | avoid oversize bodies in bounces. The default value matches RFC |
62b7cd08 JH |
239 | limits. |
240 | ||
3615fa9a HSHR |
241 | 9. New $initial_cwd expansion variable. |
242 | ||
0d9b78be | 243 | |
71224040 JH |
244 | Version 4.86 |
245 | ------------ | |
246 | ||
247 | 1. Support for using the system standard CA bundle. | |
248 | ||
249 | 2. New expansion items $config_file, $config_dir, containing the file | |
250 | and directory name of the main configuration file. Also $exim_version. | |
251 | ||
b6fbf22d JH |
252 | 3. New "malware=" support for Avast. |
253 | ||
cc00f4af JH |
254 | 4. New "spam=" variant option for Rspamd. |
255 | ||
256 | 5. Assorted options on malware= and spam= scanners. | |
257 | ||
f59aaaaa | 258 | 6. A command-line option to write a comment into the logfile. |
cc00f4af | 259 | |
7eb6c37c | 260 | 7. If built with EXPERIMENTAL_SOCKS feature enabled, the smtp transport can |
3c8b3577 JH |
261 | be configured to make connections via socks5 proxies. |
262 | ||
263 | 8. If built with EXPERIMENTAL_INTERNATIONAL, support is included for | |
264 | the transmission of UTF-8 envelope addresses. | |
7eb6c37c | 265 | |
ed0512a1 JH |
266 | 9. If built with EXPERIMENTAL_INTERNATIONAL, an expansion item for a commonly |
267 | used encoding of Maildir folder names. | |
268 | ||
b3ef41c9 | 269 | 10. A logging option for slow DNS lookups. |
846430d9 | 270 | |
089fc87a JH |
271 | 11. New ${env {<variable>}} expansion. |
272 | ||
b3ef41c9 JH |
273 | 12. A non-SMTP authenticator using information from TLS client certificates. |
274 | ||
10ca4f1c | 275 | 13. Main option "tls_eccurve" for selecting an Elliptic Curve for TLS. |
65463bc9 | 276 | Patch originally by Wolfgang Breyha. |
10ca4f1c | 277 | |
09b80b4e JH |
278 | 14. Main option "dns_trust_aa" for trusting your local nameserver at the |
279 | same level as DNSSEC. | |
280 | ||
7eb6c37c | 281 | |
533fe9b8 TL |
282 | Version 4.85 |
283 | ------------ | |
284 | ||
285 | 1. If built with EXPERIMENTAL_DANE feature enabled, Exim will follow the | |
f59aaaaa | 286 | DANE SMTP draft to assess a secure chain of trust of the certificate |
533fe9b8 TL |
287 | used to establish the TLS connection based on a TLSA record in the |
288 | domain of the sender. | |
289 | ||
290 | 2. The EXPERIMENTAL_TPDA feature has been renamed to EXPERIMENTAL_EVENT | |
291 | and several new events have been created. The reason is because it has | |
292 | been expanded beyond just firing events during the transport phase. Any | |
293 | existing TPDA transport options will have to be rewritten to use a new | |
294 | $event_name expansion variable in a condition. Refer to the | |
295 | experimental-spec.txt for details and examples. | |
296 | ||
297 | 3. The EXPERIMENTAL_CERTNAMES features is an enhancement to verify that | |
298 | server certs used for TLS match the result of the MX lookup. It does | |
299 | not use the same mechanism as DANE. | |
300 | ||
301 | ||
1f0ebb98 TL |
302 | Version 4.84 |
303 | ------------ | |
304 | ||
305 | ||
6ece2e77 TL |
306 | Version 4.83 |
307 | ------------ | |
308 | ||
a3c86431 TL |
309 | 1. If built with the EXPERIMENTAL_PROXY feature enabled, Exim can be |
310 | configured to expect an initial header from a proxy that will make the | |
311 | actual external source IP:host be used in exim instead of the IP of the | |
312 | proxy that is connecting to it. | |
313 | ||
770747fd MFM |
314 | 2. New verify option header_names_ascii, which will check to make sure |
315 | there are no non-ASCII characters in header names. Exim itself handles | |
316 | those non-ASCII characters, but downstream apps may not, so Exim can | |
317 | detect and reject if those characters are present. | |
318 | ||
b9c2e32f AR |
319 | 3. New expansion operator ${utf8clean:string} to replace malformed UTF8 |
320 | codepoints with valid ones. | |
321 | ||
b1f8e4f8 JH |
322 | 4. New malware type "sock". Talks over a Unix or TCP socket, sending one |
323 | command line and matching a regex against the return data for trigger | |
007a2dee | 324 | and a second regex to extract malware_name. The mail spoolfile name can |
b1f8e4f8 JH |
325 | be included in the command line. |
326 | ||
dc4dc04e JH |
327 | 5. The smtp transport now supports options "tls_verify_hosts" and |
328 | "tls_try_verify_hosts". If either is set the certificate verification | |
329 | is split from the encryption operation. The default remains that a failed | |
330 | verification cancels the encryption. | |
214042d2 | 331 | |
deae092e HS |
332 | 6. New SERVERS override of default ldap server list. In the ACLs, an ldap |
333 | lookup can now set a list of servers to use that is different from the | |
334 | default list. | |
335 | ||
8d91c6dc LT |
336 | 7. New command-line option -C for exiqgrep to specify alternate exim.conf |
337 | file when searching the queue. | |
338 | ||
f2de3a33 | 339 | 8. OCSP now supports GnuTLS also, if you have version 3.1.3 or later of that. |
2b4a568d | 340 | |
578897ea JH |
341 | 9. Support for DNSSEC on outbound connections. |
342 | ||
9d1c15ef | 343 | 10. New variables "tls_(in,out)_(our,peer)cert" and expansion item |
6a8a60e0 | 344 | "certextract" to extract fields from them. Hash operators md5 and sha1 |
9ef9101c JH |
345 | work over them for generating fingerprints, and a new sha256 operator |
346 | for them added. | |
9d1c15ef | 347 | |
8ccd00b1 JH |
348 | 11. PRDR is now supported dy default. |
349 | ||
f2de3a33 JH |
350 | 12. OCSP stapling is now supported by default. |
351 | ||
352 | 13. If built with the EXPERIMENTAL_DSN feature enabled, Exim will output | |
4c04137d | 353 | Delivery Status Notification messages in MIME format, and negotiate |
f2de3a33 JH |
354 | DSN features per RFC 3461. |
355 | ||
6ece2e77 | 356 | |
2c422e6f | 357 | Version 4.82 |
98a90c36 PP |
358 | ------------ |
359 | ||
360 | 1. New command-line option -bI:sieve will list all supported sieve extensions | |
361 | of this Exim build on standard output, one per line. | |
362 | ManageSieve (RFC 5804) providers managing scripts for use by Exim should | |
363 | query this to establish the correct list to include in the protocol's | |
364 | SIEVE capability line. | |
365 | ||
12f69989 PP |
366 | 2. If the -n option is combined with the -bP option, then the name of an |
367 | emitted option is not output, only the value (if visible to you). | |
368 | For instance, "exim -n -bP pid_file_path" should just emit a pathname | |
369 | followed by a newline, and no other text. | |
370 | ||
54c90be1 PP |
371 | 3. When built with SUPPORT_TLS and USE_GNUTLS, the SMTP transport driver now |
372 | has a "tls_dh_min_bits" option, to set the minimum acceptable number of | |
373 | bits in the Diffie-Hellman prime offered by a server (in DH ciphersuites) | |
374 | acceptable for security. (Option accepted but ignored if using OpenSSL). | |
375 | Defaults to 1024, the old value. May be lowered only to 512, or raised as | |
376 | far as you like. Raising this may hinder TLS interoperability with other | |
377 | sites and is not currently recommended. Lowering this will permit you to | |
378 | establish a TLS session which is not as secure as you might like. | |
379 | ||
380 | Unless you really know what you are doing, leave it alone. | |
381 | ||
1f4a55da | 382 | 4. If not built with DISABLE_DNSSEC, Exim now has the main option |
0fbd9bff | 383 | dns_dnssec_ok; if set to 1 then Exim will initialise the resolver library |
1f4a55da PP |
384 | to send the DO flag to your recursive resolver. If you have a recursive |
385 | resolver, which can set the Authenticated Data (AD) flag in results, Exim | |
0fbd9bff PP |
386 | can now detect this. Exim does not perform validation itself, instead |
387 | relying upon a trusted path to the resolver. | |
1f4a55da PP |
388 | |
389 | Current status: work-in-progress; $sender_host_dnssec variable added. | |
390 | ||
36a3ae5f PP |
391 | 5. DSCP support for outbound connections: on a transport using the smtp driver, |
392 | set "dscp = ef", for instance, to cause the connections to have the relevant | |
13363eba PP |
393 | DSCP (IPv4 TOS or IPv6 TCLASS) value in the header. |
394 | ||
395 | Similarly for inbound connections, there is a new control modifier, dscp, | |
396 | so "warn control = dscp/ef" in the connect ACL, or after authentication. | |
397 | ||
398 | Supported values depend upon system libraries. "exim -bI:dscp" to list the | |
399 | ones Exim knows of. You can also set a raw number 0..0x3F. | |
36a3ae5f | 400 | |
f4ee74ac PP |
401 | 6. The -G command-line flag is no longer ignored; it is now equivalent to an |
402 | ACL setting "control = suppress_local_fixups". The -L command-line flag | |
403 | is now accepted and forces use of syslog, with the provided tag as the | |
404 | process name. A few other flags used by Sendmail are now accepted and | |
405 | ignored. | |
406 | ||
976b7e9f | 407 | 7. New cutthrough routing feature. Requested by a "control = cutthrough_delivery" |
4c04137d | 408 | ACL modifier; works for single-recipient mails which are received on and |
976b7e9f JH |
409 | deliverable via SMTP. Using the connection made for a recipient verify, |
410 | if requested before the verify, or a new one made for the purpose while | |
411 | the inbound connection is still active. The bulk of the mail item is copied | |
412 | direct from the inbound socket to the outbound (as well as the spool file). | |
413 | When the source notifies the end of data, the data acceptance by the destination | |
4c04137d | 414 | is negotiated before the acceptance is sent to the source. If the destination |
976b7e9f JH |
415 | does not accept the mail item, for example due to content-scanning, the item |
416 | is not accepted from the source and therefore there is no need to generate | |
417 | a bounce mail. This is of benefit when providing a secondary-MX service. | |
418 | The downside is that delays are under the control of the ultimate destination | |
419 | system not your own. | |
420 | ||
4c04137d | 421 | The Received-by: header on items delivered by cutthrough is generated |
042eb971 | 422 | early in reception rather than at the end; this will affect any timestamp |
976b7e9f JH |
423 | included. The log line showing delivery is recorded before that showing |
424 | reception; it uses a new ">>" tag instead of "=>". | |
06a6f4ed | 425 | |
976b7e9f JH |
426 | To support the feature, verify-callout connections can now use ESMTP and TLS. |
427 | The usual smtp transport options are honoured, plus a (new, default everything) | |
428 | hosts_verify_avoid_tls. | |
429 | ||
430 | New variable families named tls_in_cipher, tls_out_cipher etc. are introduced | |
431 | for specific access to the information for each connection. The old names | |
432 | are present for now but deprecated. | |
433 | ||
fcc8e047 | 434 | Not yet supported: IGNOREQUOTA, SIZE, PIPELINING. |
976b7e9f | 435 | |
a64a3dfa JH |
436 | 8. New expansion operators ${listnamed:name} to get the content of a named list |
437 | and ${listcount:string} to count the items in a list. | |
98a90c36 | 438 | |
2519e60d | 439 | 9. New global option "gnutls_allow_auto_pkcs11", defaults false. The GnuTLS |
a5f239e4 PP |
440 | rewrite in 4.80 combines with GnuTLS 2.12.0 or later, to autoload PKCS11 |
441 | modules. For some situations this is desirable, but we expect admin in | |
442 | those situations to know they want the feature. More commonly, it means | |
443 | that GUI user modules get loaded and are broken by the setuid Exim being | |
444 | unable to access files specified in environment variables and passed | |
445 | through, thus breakage. So we explicitly inhibit the PKCS11 initialisation | |
446 | unless this new option is set. | |
447 | ||
2519e60d TL |
448 | Some older OS's with earlier versions of GnuTLS might not have pkcs11 ability, |
449 | so have also added a build option which can be used to build Exim with GnuTLS | |
450 | but without trying to use any kind of PKCS11 support. Uncomment this in the | |
451 | Local/Makefile: | |
452 | ||
453 | AVOID_GNUTLS_PKCS11=yes | |
454 | ||
3e8abda0 | 455 | 10. The "acl = name" condition on an ACL now supports optional arguments. |
bef3ea7f JH |
456 | New expansion item "${acl {name}{arg}...}" and expansion condition |
457 | "acl {{name}{arg}...}" are added. In all cases up to nine arguments | |
458 | can be used, appearing in $acl_arg1 to $acl_arg9 for the called ACL. | |
459 | Variable $acl_narg contains the number of arguments. If the ACL sets | |
460 | a "message =" value this becomes the result of the expansion item, | |
461 | or the value of $value for the expansion condition. If the ACL returns | |
462 | accept the expansion condition is true; if reject, false. A defer | |
463 | return results in a forced fail. | |
a5f239e4 | 464 | |
846726c5 JH |
465 | 11. Routers and transports can now have multiple headers_add and headers_remove |
466 | option lines. The concatenated list is used. | |
467 | ||
e7568d51 TL |
468 | 12. New ACL modifier "remove_header" can remove headers before message gets |
469 | handled by routers/transports. | |
470 | ||
3a796370 JH |
471 | 13. New dnsdb lookup pseudo-type "a+". A sequence of "a6" (if configured), |
472 | "aaaa" and "a" lookups is done and the full set of results returned. | |
473 | ||
362145b5 | 474 | 14. New expansion variable $headers_added with content from ACL add_header |
85ffcba6 | 475 | modifier (but not yet added to message). |
362145b5 | 476 | |
bd0fff00 | 477 | 15. New 8bitmime status logging option for received messages. Log field "M8S". |
3c0a92dc | 478 | |
c8e2fc1e JH |
479 | 16. New authenticated_sender logging option, adding to log field "A". |
480 | ||
181d9bf8 | 481 | 17. New expansion variables $router_name and $transport_name. Useful |
f59aaaaa | 482 | particularly for debug_print as -bt command-line option does not |
2a47f028 | 483 | require privilege whereas -d does. |
181d9bf8 | 484 | |
fd98a5c6 JH |
485 | 18. If built with EXPERIMENTAL_PRDR, per-recipient data responses per a |
486 | proposed extension to SMTP from Eric Hall. | |
487 | ||
700d22f3 PP |
488 | 19. The pipe transport has gained the force_command option, to allow |
489 | decorating commands from user .forward pipe aliases with prefix | |
490 | wrappers, for instance. | |
491 | ||
fcc8e047 JH |
492 | 20. Callout connections can now AUTH; the same controls as normal delivery |
493 | connections apply. | |
494 | ||
b1f37849 TL |
495 | 21. Support for DMARC, using opendmarc libs, can be enabled. It adds new |
496 | options: dmarc_forensic_sender, dmarc_history_file, and dmarc_tld_file. | |
497 | It adds new expansion variables $dmarc_ar_header, $dmarc_status, | |
498 | $dmarc_status_text, and $dmarc_used_domain. It adds a new acl modifier | |
499 | dmarc_status. It adds new control flags dmarc_disable_verify and | |
687cac44 HSHR |
500 | dmarc_enable_forensic. The default for the dmarc_tld_file option is |
501 | "/etc/exim/opendmarc.tlds" and can be changed via EDITME. | |
b1f37849 TL |
502 | |
503 | 22. Add expansion variable $authenticated_fail_id, which is the username | |
504 | provided to the authentication method which failed. It is available | |
505 | for use in subsequent ACL processing (typically quit or notquit ACLs). | |
506 | ||
4c04137d | 507 | 23. New ACL modifier "udpsend" can construct a UDP packet to send to a given |
7142daca PP |
508 | UDP host and port. |
509 | ||
510 | 24. New ${hexquote:..string..} expansion operator converts non-printable | |
511 | characters in the string to \xNN form. | |
512 | ||
1a7b746d TL |
513 | 25. Experimental TPDA (Transport Post Delivery Action) function added. |
514 | Patch provided by Axel Rau. | |
515 | ||
4dd78911 TL |
516 | 26. Experimental Redis lookup added. Patch provided by Warren Baker. |
517 | ||
181d9bf8 | 518 | |
b1770b6e | 519 | Version 4.80 |
c1e794ba PP |
520 | ------------ |
521 | ||
522 | 1. New authenticator driver, "gsasl". Server-only (at present). | |
523 | This is a SASL interface, licensed under GPL, which can be found at | |
524 | http://www.gnu.org/software/gsasl/. | |
525 | This system does not provide sources of data for authentication, so | |
3b4f55a3 | 526 | careful use needs to be made of the conditions in Exim. |
c1e794ba | 527 | |
97753960 PP |
528 | 2. New authenticator driver, "heimdal_gssapi". Server-only. |
529 | A replacement for using cyrus_sasl with Heimdal, now that $KRB5_KTNAME | |
530 | is no longer honoured for setuid programs by Heimdal. Use the | |
531 | "server_keytab" option to point to the keytab. | |
532 | ||
252e0c7b PP |
533 | 3. The "pkg-config" system can now be used when building Exim to reference |
534 | cflags and library information for lookups and authenticators, rather | |
535 | than having to update "CFLAGS", "AUTH_LIBS", "LOOKUP_INCLUDE" and | |
7e6a8985 PP |
536 | "LOOKUP_LIBS" directly. Similarly for handling the TLS library support |
537 | without adjusting "TLS_INCLUDE" and "TLS_LIBS". | |
252e0c7b | 538 | |
6a6084f8 PP |
539 | In addition, setting PCRE_CONFIG=yes will query the pcre-config tool to |
540 | find the headers and libraries for PCRE. | |
541 | ||
f1e05cc7 | 542 | 4. New expansion variable $tls_bits. |
20aa9dbd | 543 | |
4a6a987a PP |
544 | 5. New lookup type, "dbmjz". Key is an Exim list, the elements of which will |
545 | be joined together with ASCII NUL characters to construct the key to pass | |
3b4f55a3 PP |
546 | into the DBM library. Can be used with gsasl to access sasldb2 files as |
547 | used by Cyrus SASL. | |
4a6a987a | 548 | |
da3ad30d PP |
549 | 6. OpenSSL now supports TLS1.1 and TLS1.2 with OpenSSL 1.0.1. |
550 | ||
551 | Avoid release 1.0.1a if you can. Note that the default value of | |
552 | "openssl_options" is no longer "+dont_insert_empty_fragments", as that | |
553 | increased susceptibility to attack. This may still have interoperability | |
554 | implications for very old clients (see version 4.31 change 37) but | |
555 | administrators can choose to make the trade-off themselves and restore | |
556 | compatibility at the cost of session security. | |
557 | ||
7be682ca PP |
558 | 7. Use of the new expansion variable $tls_sni in the main configuration option |
559 | tls_certificate will cause Exim to re-expand the option, if the client | |
560 | sends the TLS Server Name Indication extension, to permit choosing a | |
561 | different certificate; tls_privatekey will also be re-expanded. You must | |
562 | still set these options to expand to valid files when $tls_sni is not set. | |
3f0945ff PP |
563 | |
564 | The SMTP Transport has gained the option tls_sni, which will set a hostname | |
565 | for outbound TLS sessions, and set $tls_sni too. | |
566 | ||
567 | A new log_selector, +tls_sni, has been added, to log received SNI values | |
568 | for Exim as a server. | |
569 | ||
9cbad13b PP |
570 | 8. The existing "accept_8bitmime" option now defaults to true. This means |
571 | that Exim is deliberately not strictly RFC compliant. We're following | |
572 | Dan Bernstein's advice in http://cr.yp.to/smtp/8bitmime.html by default. | |
573 | Those who disagree, or know that they are talking to mail servers that, | |
574 | even today, are not 8-bit clean, need to turn off this option. | |
575 | ||
9ee44efb PP |
576 | 9. Exim can now be started with -bw (with an optional timeout, given as |
577 | -bw<timespec>). With this, stdin at startup is a socket that is | |
578 | already listening for connections. This has a more modern name of | |
579 | "socket activation", but forcing the activated socket to fd 0. We're | |
580 | interested in adding more support for modern variants. | |
581 | ||
eae0036b | 582 | 10. ${eval } now uses 64-bit values on supporting platforms. A new "G" suffix |
97d17305 JH |
583 | for numbers indicates multiplication by 1024^3. |
584 | ||
17c76198 PP |
585 | 11. The GnuTLS support has been revamped; the three options gnutls_require_kx, |
586 | gnutls_require_mac & gnutls_require_protocols are no longer supported. | |
587 | tls_require_ciphers is now parsed by gnutls_priority_init(3) as a priority | |
588 | string, documentation for which is at: | |
42bfef1e | 589 | http://www.gnutls.org/manual/html_node/Priority-Strings.html |
17c76198 PP |
590 | |
591 | SNI support has been added to Exim's GnuTLS integration too. | |
592 | ||
af3498d6 PP |
593 | For sufficiently recent GnuTLS libraries, ${randint:..} will now use |
594 | gnutls_rnd(), asking for GNUTLS_RND_NONCE level randomness. | |
595 | ||
53947857 | 596 | 12. With OpenSSL, if built with EXPERIMENTAL_OCSP, a new option tls_ocsp_file |
3f7eeb86 PP |
597 | is now available. If the contents of the file are valid, then Exim will |
598 | send that back in response to a TLS status request; this is OCSP Stapling. | |
599 | Exim will not maintain the contents of the file in any way: administrators | |
600 | are responsible for ensuring that it is up-to-date. | |
601 | ||
602 | See "experimental-spec.txt" for more details. | |
603 | ||
eae0036b PP |
604 | 13. ${lookup dnsdb{ }} supports now SPF record types. They are handled |
605 | identically to TXT record lookups. | |
606 | ||
2605c55b | 607 | 14. New expansion variable $tod_epoch_l for higher-precision time. |
c1e794ba | 608 | |
3375e053 PP |
609 | 15. New global option tls_dh_max_bits, defaulting to current value of NSS |
610 | hard-coded limit of DH ephemeral bits, to fix interop problems caused by | |
611 | GnuTLS 2.12 library recommending a bit count higher than NSS supports. | |
612 | ||
a799883d PP |
613 | 16. tls_dhparam now used by both OpenSSL and GnuTLS, can be path or identifier. |
614 | Option can now be a path or an identifier for a standard prime. | |
615 | If unset, we use the DH prime from section 2.2 of RFC 5114, "ike23". | |
616 | Set to "historic" to get the old GnuTLS behaviour of auto-generated DH | |
617 | primes. | |
618 | ||
3ecab157 | 619 | 17. SSLv2 now disabled by default in OpenSSL. (Never supported by GnuTLS). |
f0f5a555 PP |
620 | Use "openssl_options -no_sslv2" to re-enable support, if your OpenSSL |
621 | install was not built with OPENSSL_NO_SSL2 ("no-ssl2"). | |
622 | ||
9e45c72b | 623 | |
3ce96ada TF |
624 | Version 4.77 |
625 | ------------ | |
626 | ||
627 | 1. New options for the ratelimit ACL condition: /count= and /unique=. | |
628 | The /noupdate option has been replaced by a /readonly option. | |
629 | ||
061b7ebd PP |
630 | 2. The SMTP transport's protocol option may now be set to "smtps", to |
631 | use SSL-on-connect outbound. | |
632 | ||
9e949f00 PP |
633 | 3. New variable $av_failed, set true if the AV scanner deferred; ie, when |
634 | there is a problem talking to the AV scanner, or the AV scanner running. | |
635 | ||
39257585 PP |
636 | 4. New expansion conditions, "inlist" and "inlisti", which take simple lists |
637 | and check if the search item is a member of the list. This does not | |
638 | support named lists, but does subject the list part to string expansion. | |
639 | ||
640 | 5. Unless the new EXPAND_LISTMATCH_RHS build option is set when Exim was | |
641 | built, Exim no longer performs string expansion on the second string of | |
642 | the match_* expansion conditions: "match_address", "match_domain", | |
643 | "match_ip" & "match_local_part". Named lists can still be used. | |
644 | ||
7c6d71af | 645 | |
e97d1f08 PP |
646 | Version 4.76 |
647 | ------------ | |
648 | ||
649 | 1. The global option "dns_use_edns0" may be set to coerce EDNS0 usage on | |
650 | or off in the resolver library. | |
651 | ||
652 | ||
bc19a55b PP |
653 | Version 4.75 |
654 | ------------ | |
655 | ||
656 | 1. In addition to the existing LDAP and LDAP/SSL ("ldaps") support, there | |
657 | is now LDAP/TLS support, given sufficiently modern OpenLDAP client | |
658 | libraries. The following global options have been added in support of | |
659 | this: ldap_ca_cert_dir, ldap_ca_cert_file, ldap_cert_file, ldap_cert_key, | |
660 | ldap_cipher_suite, ldap_require_cert, ldap_start_tls. | |
661 | ||
2fe76745 PP |
662 | 2. The pipe transport now takes a boolean option, "freeze_signal", default |
663 | false. When true, if the external delivery command exits on a signal then | |
664 | Exim will freeze the message in the queue, instead of generating a bounce. | |
665 | ||
f1e5fef5 PP |
666 | 3. Log filenames may now use %M as an escape, instead of %D (still available). |
667 | The %M pattern expands to yyyymm, providing month-level resolution. | |
668 | ||
332f5cf3 PP |
669 | 4. The $message_linecount variable is now updated for the maildir_tag option, |
670 | in the same way as $message_size, to reflect the real number of lines, | |
671 | including any header additions or removals from transport. | |
672 | ||
29cfeb94 PP |
673 | 5. When contacting a pool of SpamAssassin servers configured in spamd_address, |
674 | Exim now selects entries randomly, to better scale in a cluster setup. | |
675 | ||
bc19a55b | 676 | |
a01ba081 PP |
677 | Version 4.74 |
678 | ------------ | |
679 | ||
1670ef10 PP |
680 | 1. SECURITY FIX: privilege escalation flaw fixed. On Linux (and only Linux) |
681 | the flaw permitted the Exim run-time user to cause root to append to | |
682 | arbitrary files of the attacker's choosing, with the content based | |
683 | on content supplied by the attacker. | |
684 | ||
685 | 2. Exim now supports loading some lookup types at run-time, using your | |
a01ba081 PP |
686 | platform's dlopen() functionality. This has limited platform support |
687 | and the intention is not to support every variant, it's limited to | |
688 | dlopen(). This permits the main Exim binary to not be linked against | |
689 | all the libraries needed for all the lookup types. | |
690 | ||
691 | ||
77bb000f PP |
692 | Version 4.73 |
693 | ------------ | |
694 | ||
2cfd3221 PP |
695 | NOTE: this version is not guaranteed backwards-compatible, please read the |
696 | items below carefully | |
697 | ||
77bb000f PP |
698 | 1. A new main configuration option, "openssl_options", is available if Exim |
699 | is built with SSL support provided by OpenSSL. The option allows | |
700 | administrators to specify OpenSSL options to be used on connections; | |
701 | typically this is to set bug compatibility features which the OpenSSL | |
702 | developers have not enabled by default. There may be security | |
703 | consequences for certain options, so these should not be changed | |
704 | frivolously. | |
705 | ||
a29e5231 PP |
706 | 2. A new pipe transport option, "permit_coredumps", may help with problem |
707 | diagnosis in some scenarios. Note that Exim is typically installed as | |
708 | a setuid binary, which on most OSes will inhibit coredumps by default, | |
43236f35 | 709 | so that safety mechanism would have to be overridden for this option to |
a29e5231 PP |
710 | be able to take effect. |
711 | ||
8544e77a PP |
712 | 3. ClamAV 0.95 is now required for ClamAV support in Exim, unless |
713 | Local/Makefile sets: WITH_OLD_CLAMAV_STREAM=yes | |
714 | Note that this switches Exim to use a new API ("INSTREAM") and a future | |
715 | release of ClamAV will remove support for the old API ("STREAM"). | |
716 | ||
717 | The av_scanner option, when set to "clamd", now takes an optional third | |
718 | part, "local", which causes Exim to pass a filename to ClamAV instead of | |
719 | the file content. This is the same behaviour as when clamd is pointed at | |
720 | a Unix-domain socket. For example: | |
721 | ||
722 | av_scanner = clamd:192.0.2.3 1234:local | |
723 | ||
491fab4c PP |
724 | ClamAV's ExtendedDetectionInfo response format is now handled. |
725 | ||
8544e77a PP |
726 | 4. There is now a -bmalware option, restricted to admin users. This option |
727 | takes one parameter, a filename, and scans that file with Exim's | |
728 | malware-scanning framework. This is intended purely as a debugging aid | |
729 | to ensure that Exim's scanning is working, not to replace other tools. | |
a9622bc6 PP |
730 | Note that the ACL framework is not invoked, so if av_scanner references |
731 | ACL variables without a fallback then this will fail. | |
8544e77a | 732 | |
83e029d5 PP |
733 | 5. There is a new expansion operator, "reverse_ip", which will reverse IP |
734 | addresses; IPv4 into dotted quad, IPv6 into dotted nibble. Examples: | |
735 | ||
736 | ${reverse_ip:192.0.2.4} | |
737 | -> 4.2.0.192 | |
738 | ${reverse_ip:2001:0db8:c42:9:1:abcd:192.0.2.3} | |
739 | -> 3.0.2.0.0.0.0.c.d.c.b.a.1.0.0.0.9.0.0.0.2.4.c.0.8.b.d.0.1.0.0.2 | |
740 | ||
ed7f7860 PP |
741 | 6. There is a new ACL control called "debug", to enable debug logging. |
742 | This allows selective logging of certain incoming transactions within | |
743 | production environments, with some care. It takes two options, "tag" | |
744 | and "opts"; "tag" is included in the filename of the log and "opts" | |
745 | is used as per the -d<options> command-line option. Examples, which | |
746 | don't all make sense in all contexts: | |
747 | ||
748 | control = debug | |
749 | control = debug/tag=.$sender_host_address | |
750 | control = debug/opts=+expand+acl | |
751 | control = debug/tag=.$message_exim_id/opts=+expand | |
752 | ||
10385c15 PP |
753 | 7. It has always been implicit in the design and the documentation that |
754 | "the Exim user" is not root. src/EDITME said that using root was | |
755 | "very strongly discouraged". This is not enough to keep people from | |
756 | shooting themselves in the foot in days when many don't configure Exim | |
757 | themselves but via package build managers. The security consequences of | |
758 | running various bits of network code are severe if there should be bugs in | |
759 | them. As such, the Exim user may no longer be root. If configured | |
760 | statically, Exim will refuse to build. If configured as ref:user then Exim | |
761 | will exit shortly after start-up. If you must shoot yourself in the foot, | |
762 | then henceforth you will have to maintain your own local patches to strip | |
763 | the safeties off. | |
764 | ||
06a6f4ed | 765 | 8. There is a new expansion condition, bool_lax{}. Where bool{} uses the ACL |
6a8de854 PP |
766 | condition logic to determine truth/failure and will fail to expand many |
767 | strings, bool_lax{} uses the router condition logic, where most strings | |
768 | do evaluate true. | |
769 | Note: bool{00} is false, bool_lax{00} is true. | |
770 | ||
06a6f4ed | 771 | 9. Routers now support multiple "condition" tests. |
532be449 | 772 | |
5dc43717 JJ |
773 | 10. There is now a runtime configuration option "tcp_wrappers_daemon_name". |
774 | Setting this allows an admin to define which entry in the tcpwrappers | |
775 | config file will be used to control access to the daemon. This option | |
776 | is only available when Exim is built with USE_TCP_WRAPPERS. The | |
777 | default value is set at build time using the TCP_WRAPPERS_DAEMON_NAME | |
778 | build option. | |
779 | ||
79d4bc3d PP |
780 | 11. [POSSIBLE CONFIG BREAKAGE] The default value for system_filter_user is now |
781 | the Exim run-time user, instead of root. | |
782 | ||
2cfd3221 PP |
783 | 12. [POSSIBLE CONFIG BREAKAGE] ALT_CONFIG_ROOT_ONLY is no longer optional and |
784 | is forced on. This is mitigated by the new build option | |
90b6341f | 785 | TRUSTED_CONFIG_LIST which defines a list of configuration files which |
7f7f0545 DW |
786 | are trusted; one per line. If a config file is owned by root and matches |
787 | a pathname in the list, then it may be invoked by the Exim build-time | |
788 | user without Exim relinquishing root privileges. | |
2cfd3221 PP |
789 | |
790 | 13. [POSSIBLE CONFIG BREAKAGE] The Exim user is no longer automatically | |
791 | trusted to supply -D<Macro[=Value]> overrides on the command-line. Going | |
90b6341f DW |
792 | forward, we recommend using TRUSTED_CONFIG_LIST with shim configs that |
793 | include the main config. As a transition mechanism, we are temporarily | |
794 | providing a work-around: the new build option WHITELIST_D_MACROS provides | |
43236f35 | 795 | a colon-separated list of macro names which may be overridden by the Exim |
90b6341f DW |
796 | run-time user. The values of these macros are constrained to the regex |
797 | ^[A-Za-z0-9_/.-]*$ (which explicitly does allow for empty values). | |
2cfd3221 | 798 | |
77bb000f | 799 | |
3fc596e4 NM |
800 | Version 4.72 |
801 | ------------ | |
802 | ||
b26eacf1 PP |
803 | 1. TWO SECURITY FIXES: one relating to mail-spools which are globally |
804 | writable, the other to locking of MBX folders (not mbox). | |
805 | ||
806 | 2. MySQL stored procedures are now supported. | |
807 | ||
808 | 3. The dkim_domain transport option is now a list, not a single string, and | |
809 | messages will be signed for each element in the list (discarding | |
810 | duplicates). | |
811 | ||
812 | 4. The 4.70 release unexpectedly changed the behaviour of dnsdb TXT lookups | |
813 | in the presence of multiple character strings within the RR. Prior to 4.70, | |
814 | only the first string would be returned. The dnsdb lookup now, by default, | |
815 | preserves the pre-4.70 semantics, but also now takes an extended output | |
8f425947 PP |
816 | separator specification. The separator can be followed by a semicolon, to |
817 | concatenate the individual text strings together with no join character, | |
818 | or by a comma and a second separator character, in which case the text | |
819 | strings within a TXT record are joined on that second character. | |
820 | Administrators are reminded that DNS provides no ordering guarantees | |
821 | between multiple records in an RRset. For example: | |
b26eacf1 PP |
822 | |
823 | foo.example. IN TXT "a" "b" "c" | |
824 | foo.example. IN TXT "d" "e" "f" | |
825 | ||
826 | ${lookup dnsdb{>/ txt=foo.example}} -> "a/d" | |
827 | ${lookup dnsdb{>/; txt=foo.example}} -> "def/abc" | |
8f425947 | 828 | ${lookup dnsdb{>/,+ txt=foo.example}} -> "a+b+c/d+e+f" |
b26eacf1 | 829 | |
3fc596e4 | 830 | |
f33253cc NM |
831 | Version 4.70 / 4.71 |
832 | ------------------- | |
65a7d8c3 | 833 | |
7c6d71af | 834 | 1. Native DKIM support without an external library. |
a8c8d6b5 JJ |
835 | (Note that if no action to prevent it is taken, a straight upgrade will |
836 | result in DKIM verification of all signed incoming emails. See spec | |
837 | for details on conditionally disabling) | |
7c6d71af NM |
838 | |
839 | 2. Experimental DCC support via dccifd (contributed by Wolfgang Breyha). | |
65a7d8c3 | 840 | |
f33253cc | 841 | 3. There is now a bool{} expansion condition which maps certain strings to |
7d9f747b | 842 | true/false condition values (most likely of use in conjunction with the |
f33253cc NM |
843 | and{} expansion operator). |
844 | ||
845 | 4. The $spam_score, $spam_bar and $spam_report variables are now available | |
846 | at delivery time. | |
847 | ||
848 | 5. exim -bP now supports "macros", "macro_list" or "macro MACRO_NAME" as | |
849 | options, provided that Exim is invoked by an admin_user. | |
850 | ||
851 | 6. There is a new option gnutls_compat_mode, when linked against GnuTLS, | |
852 | which increases compatibility with older clients at the cost of decreased | |
853 | security. Don't set this unless you need to support such clients. | |
854 | ||
855 | 7. There is a new expansion operator, ${randint:...} which will produce a | |
856 | "random" number less than the supplied integer. This randomness is | |
857 | not guaranteed to be cryptographically strong, but depending upon how | |
858 | Exim was built may be better than the most naive schemes. | |
859 | ||
860 | 8. Exim now explicitly ensures that SHA256 is available when linked against | |
861 | OpenSSL. | |
862 | ||
863 | 9. The transport_filter_timeout option now applies to SMTP transports too. | |
864 | ||
65a7d8c3 | 865 | |
7d9f747b PP |
866 | Version 4.69 |
867 | ------------ | |
868 | ||
869 | 1. Preliminary DKIM support in Experimental. | |
870 | ||
871 | ||
2b85bce7 PH |
872 | Version 4.68 |
873 | ------------ | |
874 | ||
875 | 1. The body_linecount and body_zerocount C variables are now exported in the | |
876 | local_scan API. | |
877 | ||
93655c46 PH |
878 | 2. When a dnslists lookup succeeds, the key that was looked up is now placed |
879 | in $dnslist_matched. When the key is an IP address, it is not reversed in | |
880 | this variable (though it is, of course, in the actual lookup). In simple | |
881 | cases, for example: | |
882 | ||
883 | deny dnslists = spamhaus.example | |
884 | ||
885 | the key is also available in another variable (in this case, | |
886 | $sender_host_address). In more complicated cases, however, this is not | |
887 | true. For example, using a data lookup might generate a dnslists lookup | |
888 | like this: | |
889 | ||
890 | deny dnslists = spamhaus.example/<|192.168.1.2|192.168.6.7|... | |
891 | ||
892 | If this condition succeeds, the value in $dnslist_matched might be | |
893 | 192.168.6.7 (for example). | |
894 | ||
6c512171 PH |
895 | 3. Authenticators now have a client_condition option. When Exim is running as |
896 | a client, it skips an authenticator whose client_condition expansion yields | |
897 | "0", "no", or "false". This can be used, for example, to skip plain text | |
898 | authenticators when the connection is not encrypted by a setting such as: | |
899 | ||
900 | client_condition = ${if !eq{$tls_cipher}{}} | |
901 | ||
902 | Note that the 4.67 documentation states that $tls_cipher contains the | |
903 | cipher used for incoming messages. In fact, during SMTP delivery, it | |
904 | contains the cipher used for the delivery. The same is true for | |
905 | $tls_peerdn. | |
906 | ||
a96603a0 PH |
907 | 4. There is now a -Mvc <message-id> option, which outputs a copy of the |
908 | message to the standard output, in RFC 2822 format. The option can be used | |
909 | only by an admin user. | |
910 | ||
8f240103 PH |
911 | 5. There is now a /noupdate option for the ratelimit ACL condition. It |
912 | computes the rate and checks the limit as normal, but it does not update | |
913 | the saved data. This means that, in relevant ACLs, it is possible to lookup | |
914 | the existence of a specified (or auto-generated) ratelimit key without | |
915 | incrementing the ratelimit counter for that key. | |
916 | ||
917 | In order for this to be useful, another ACL entry must set the rate | |
918 | for the same key somewhere (otherwise it will always be zero). | |
919 | ||
920 | Example: | |
921 | ||
922 | acl_check_connect: | |
923 | # Read the rate; if it doesn't exist or is below the maximum | |
924 | # we update it below | |
925 | deny ratelimit = 100 / 5m / strict / noupdate | |
926 | log_message = RATE: $sender_rate / $sender_rate_period \ | |
927 | (max $sender_rate_limit) | |
928 | ||
929 | [... some other logic and tests...] | |
930 | ||
931 | warn ratelimit = 100 / 5m / strict / per_cmd | |
932 | log_message = RATE UPDATE: $sender_rate / $sender_rate_period \ | |
933 | (max $sender_rate_limit) | |
934 | condition = ${if le{$sender_rate}{$sender_rate_limit}} | |
935 | ||
936 | accept | |
937 | ||
d677b2f2 PH |
938 | 6. The variable $max_received_linelength contains the number of bytes in the |
939 | longest line that was received as part of the message, not counting the | |
940 | line termination character(s). | |
941 | ||
d52120f2 PH |
942 | 7. Host lists can now include +ignore_defer and +include_defer, analagous to |
943 | +ignore_unknown and +include_unknown. These options should be used with | |
944 | care, probably only in non-critical host lists such as whitelists. | |
945 | ||
8669f003 PH |
946 | 8. There's a new option called queue_only_load_latch, which defaults true. |
947 | If set false when queue_only_load is greater than zero, Exim re-evaluates | |
948 | the load for each incoming message in an SMTP session. Otherwise, once one | |
949 | message is queued, the remainder are also. | |
950 | ||
4f054c63 | 951 | 9. There is a new ACL, specified by acl_smtp_notquit, which is run in most |
8f128379 PH |
952 | cases when an SMTP session ends without sending QUIT. However, when Exim |
953 | itself is is bad trouble, such as being unable to write to its log files, | |
954 | this ACL is not run, because it might try to do things (such as write to | |
955 | log files) that make the situation even worse. | |
956 | ||
957 | Like the QUIT ACL, this new ACL is provided to make it possible to gather | |
958 | statistics. Whatever it returns (accept or deny) is immaterial. The "delay" | |
959 | modifier is forbidden in this ACL. | |
960 | ||
961 | When the NOTQUIT ACL is running, the variable $smtp_notquit_reason is set | |
962 | to a string that indicates the reason for the termination of the SMTP | |
963 | connection. The possible values are: | |
964 | ||
965 | acl-drop Another ACL issued a "drop" command | |
966 | bad-commands Too many unknown or non-mail commands | |
967 | command-timeout Timeout while reading SMTP commands | |
968 | connection-lost The SMTP connection has been lost | |
969 | data-timeout Timeout while reading message data | |
970 | local-scan-error The local_scan() function crashed | |
971 | local-scan-timeout The local_scan() function timed out | |
972 | signal-exit SIGTERM or SIGINT | |
973 | synchronization-error SMTP synchronization error | |
974 | tls-failed TLS failed to start | |
975 | ||
976 | In most cases when an SMTP connection is closed without having received | |
977 | QUIT, Exim sends an SMTP response message before actually closing the | |
978 | connection. With the exception of acl-drop, the default message can be | |
979 | overridden by the "message" modifier in the NOTQUIT ACL. In the case of a | |
980 | "drop" verb in another ACL, it is the message from the other ACL that is | |
981 | used. | |
982 | ||
b7670459 PH |
983 | 10. For MySQL and PostgreSQL lookups, it is now possible to specify a list of |
984 | servers with individual queries. This is done by starting the query with | |
985 | "servers=x:y:z;", where each item in the list may take one of two forms: | |
986 | ||
987 | (1) If it is just a host name, the appropriate global option (mysql_servers | |
988 | or pgsql_servers) is searched for a host of the same name, and the | |
989 | remaining parameters (database, user, password) are taken from there. | |
990 | ||
991 | (2) If it contains any slashes, it is taken as a complete parameter set. | |
992 | ||
993 | The list of servers is used in exactly the same was as the global list. | |
994 | Once a connection to a server has happened and a query has been | |
995 | successfully executed, processing of the lookup ceases. | |
996 | ||
997 | This feature is intended for use in master/slave situations where updates | |
998 | are occurring, and one wants to update a master rather than a slave. If the | |
999 | masters are in the list for reading, you might have: | |
1000 | ||
1001 | mysql_servers = slave1/db/name/pw:slave2/db/name/pw:master/db/name/pw | |
1002 | ||
1003 | In an updating lookup, you could then write | |
1004 | ||
1005 | ${lookup mysql{servers=master; UPDATE ...} | |
1006 | ||
1007 | If, on the other hand, the master is not to be used for reading lookups: | |
1008 | ||
1009 | pgsql_servers = slave1/db/name/pw:slave2/db/name/pw | |
1010 | ||
1011 | you can still update the master by | |
1012 | ||
1013 | ${lookup pgsql{servers=master/db/name/pw; UPDATE ...} | |
1014 | ||
ddea74fa PH |
1015 | 11. The message_body_newlines option (default FALSE, for backwards |
1016 | compatibility) can be used to control whether newlines are present in | |
1017 | $message_body and $message_body_end. If it is FALSE, they are replaced by | |
1018 | spaces. | |
1019 | ||
2b85bce7 | 1020 | |
b4ed4da0 PH |
1021 | Version 4.67 |
1022 | ------------ | |
1023 | ||
1024 | 1. There is a new log selector called smtp_no_mail, which is not included in | |
1025 | the default setting. When it is set, a line is written to the main log | |
1026 | whenever an accepted SMTP connection terminates without having issued a | |
4aa45c31 | 1027 | MAIL command. |
b4ed4da0 | 1028 | |
431b7361 | 1029 | 2. When an item in a dnslists list is followed by = and & and a list of IP |
4aa45c31 PH |
1030 | addresses, the behaviour was not clear when the lookup returned more than |
1031 | one IP address. This has been solved by the addition of == and =& for "all" | |
93655c46 | 1032 | rather than the default "any" matching. |
431b7361 | 1033 | |
4aa45c31 PH |
1034 | 3. Up till now, the only control over which cipher suites GnuTLS uses has been |
1035 | for the cipher algorithms. New options have been added to allow some of the | |
1036 | other parameters to be varied. | |
431b7361 | 1037 | |
4aa45c31 PH |
1038 | 4. There is a new compile-time option called ENABLE_DISABLE_FSYNC. When it is |
1039 | set, Exim compiles a runtime option called disable_fsync. | |
431b7361 | 1040 | |
4aa45c31 | 1041 | 5. There is a new variable called $smtp_count_at_connection_start. |
431b7361 | 1042 | |
4aa45c31 | 1043 | 6. There's a new control called no_pipelining. |
cf8b11a5 | 1044 | |
41c7c167 | 1045 | 7. There are two new variables called $sending_ip_address and $sending_port. |
4aa45c31 | 1046 | These are set whenever an SMTP connection to another host has been set up. |
41c7c167 PH |
1047 | |
1048 | 8. The expansion of the helo_data option in the smtp transport now happens | |
4aa45c31 | 1049 | after the connection to the server has been made. |
41c7c167 | 1050 | |
9c57cbc0 | 1051 | 9. There is a new expansion operator ${rfc2047d: that decodes strings that |
4aa45c31 | 1052 | are encoded as per RFC 2047. |
9c57cbc0 | 1053 | |
f3f065bb PH |
1054 | 10. There is a new log selector called "pid", which causes the current process |
1055 | id to be added to every log line, in square brackets, immediately after the | |
1056 | time and date. | |
1057 | ||
047bdd8c | 1058 | 11. Exim has been modified so that it flushes SMTP output before implementing |
4c590bd1 PH |
1059 | a delay in an ACL. It also flushes the output before performing a callout, |
1060 | as this can take a substantial time. These behaviours can be disabled by | |
1061 | obeying control = no_delay_flush or control = no_callout_flush, | |
4aa45c31 | 1062 | respectively, at some earlier stage of the connection. |
047bdd8c | 1063 | |
0ce9abe6 | 1064 | 12. There are two new expansion conditions that iterate over a list. They are |
4aa45c31 | 1065 | called forany and forall. |
0ce9abe6 | 1066 | |
0e22dfd1 PH |
1067 | 13. There's a new global option called dsn_from that can be used to vary the |
1068 | contents of From: lines in bounces and other automatically generated | |
1069 | messages ("delivery status notifications" - hence the name of the option). | |
0e22dfd1 | 1070 | |
4aa45c31 | 1071 | 14. The smtp transport has a new option called hosts_avoid_pipelining. |
c51b8e75 | 1072 | |
75b1493f | 1073 | 15. By default, exigrep does case-insensitive matches. There is now a -I option |
4aa45c31 | 1074 | that makes it case-sensitive. |
29f89cad | 1075 | |
4aa45c31 PH |
1076 | 16. A number of new features ("addresses", "map", "filter", and "reduce") have |
1077 | been added to string expansions to make it easier to process lists of | |
1078 | items, typically addresses. | |
29f89cad | 1079 | |
c3611384 PH |
1080 | 17. There's a new ACL modifier called "continue". It does nothing of itself, |
1081 | and processing of the ACL always continues with the next condition or | |
1082 | modifier. It is provided so that the side effects of expanding its argument | |
4aa45c31 | 1083 | can be used. |
c3611384 | 1084 | |
ec95d1a6 | 1085 | 18. It is now possible to use newline and other control characters (those with |
4aa45c31 | 1086 | values less than 32, plus DEL) as separators in lists. |
ec95d1a6 | 1087 | |
b2d5182b PH |
1088 | 19. The exigrep utility now has a -v option, which inverts the matching |
1089 | condition. | |
1090 | ||
c456d9bb | 1091 | 20. The host_find_failed option in the manualroute router can now be set to |
4aa45c31 | 1092 | "ignore". |
c456d9bb | 1093 | |
b4ed4da0 PH |
1094 | |
1095 | Version 4.66 | |
1096 | ------------ | |
1097 | ||
1098 | No new features were added to 4.66. | |
1099 | ||
1100 | ||
1101 | Version 4.65 | |
1102 | ------------ | |
1103 | ||
1104 | No new features were added to 4.65. | |
1105 | ||
38a0a95f PH |
1106 | |
1107 | Version 4.64 | |
1108 | ------------ | |
1109 | ||
af561417 PH |
1110 | 1. ACL variables can now be given arbitrary names, as long as they start with |
1111 | "acl_c" or "acl_m" (for connection variables and message variables), are at | |
1112 | least six characters long, with the sixth character being either a digit or | |
883335dc | 1113 | an underscore. |
af561417 PH |
1114 | |
1115 | 2. There is a new ACL modifier called log_reject_target. It makes it possible | |
883335dc | 1116 | to specify which logs are used for messages about ACL rejections. |
af561417 PH |
1117 | |
1118 | 3. There is a new authenticator called "dovecot". This is an interface to the | |
1119 | authentication facility of the Dovecot POP/IMAP server, which can support a | |
883335dc | 1120 | number of authentication methods. |
af561417 PH |
1121 | |
1122 | 4. The variable $message_headers_raw provides a concatenation of all the | |
1123 | messages's headers without any decoding. This is in contrast to | |
1124 | $message_headers, which does RFC2047 decoding on the header contents. | |
1125 | ||
883335dc PH |
1126 | 5. In a DNS black list, if two domain names, comma-separated, are given, the |
1127 | second is used first to do an initial check, making use of any IP value | |
1128 | restrictions that are set. If there is a match, the first domain is used, | |
1129 | without any IP value restrictions, to get the TXT record. | |
af561417 | 1130 | |
883335dc | 1131 | 6. All authenticators now have a server_condition option. |
af561417 PH |
1132 | |
1133 | 7. There is a new command-line option called -Mset. It is useful only in | |
1134 | conjunction with -be (that is, when testing string expansions). It must be | |
1135 | followed by a message id; Exim loads the given message from its spool | |
883335dc | 1136 | before doing the expansions. |
af561417 PH |
1137 | |
1138 | 8. Another similar new command-line option is called -bem. It operates like | |
883335dc PH |
1139 | -be except that it must be followed by the name of a file that contains a |
1140 | message. | |
af561417 PH |
1141 | |
1142 | 9. When an address is delayed because of a 4xx response to a RCPT command, it | |
1143 | is now the combination of sender and recipient that is delayed in | |
883335dc | 1144 | subsequent queue runs until its retry time is reached. |
af561417 PH |
1145 | |
1146 | 10. Unary negation and the bitwise logical operators and, or, xor, not, and | |
883335dc | 1147 | shift, have been added to the eval: and eval10: expansion items. |
48c7f9e2 | 1148 | |
194cc0e4 PH |
1149 | 11. The variables $interface_address and $interface_port have been renamed |
1150 | as $received_ip_address and $received_port, to make it clear that they | |
1151 | relate to message reception rather than delivery. (The old names remain | |
1152 | available for compatibility.) | |
1153 | ||
883335dc PH |
1154 | 12. The "message" modifier can now be used on "accept" and "discard" acl verbs |
1155 | to vary the message that is sent when an SMTP command is accepted. | |
4e88a19f | 1156 | |
495ae4b0 | 1157 | |
4608d683 PH |
1158 | Version 4.63 |
1159 | ------------ | |
1160 | ||
1161 | 1. There is a new Boolean option called filter_prepend_home for the redirect | |
38a0a95f | 1162 | router. |
4608d683 | 1163 | |
45b91596 PH |
1164 | 2. There is a new acl, set by acl_not_smtp_start, which is run right at the |
1165 | start of receiving a non-SMTP message, before any of the message has been | |
38a0a95f | 1166 | read. |
45b91596 | 1167 | |
a5bd321b PH |
1168 | 3. When an SMTP error message is specified in a "message" modifier in an ACL, |
1169 | or in a :fail: or :defer: message in a redirect router, Exim now checks the | |
38a0a95f | 1170 | start of the message for an SMTP error code. |
a5bd321b | 1171 | |
6ec97b1b | 1172 | 4. There is a new parameter for LDAP lookups called "referrals", which takes |
38a0a95f | 1173 | one of the settings "follow" (the default) or "nofollow". |
6ec97b1b | 1174 | |
e22ca4ac JJ |
1175 | 5. Version 20070721.2 of exipick now included, offering these new options: |
1176 | --reverse | |
1177 | After all other sorting options have bee processed, reverse order | |
1178 | before displaying messages (-R is synonym). | |
1179 | --random | |
1180 | Randomize order of matching messages before displaying. | |
1181 | --size | |
1182 | Instead of displaying the matching messages, display the sum | |
1183 | of their sizes. | |
1184 | --sort <variable>[,<variable>...] | |
1185 | Before displaying matching messages, sort the messages according to | |
1186 | each messages value for each variable. | |
1187 | --not | |
1188 | Negate the value for every test (returns inverse output from the | |
1189 | same criteria without --not). | |
1190 | ||
4608d683 | 1191 | |
1cce3af8 PH |
1192 | Version 4.62 |
1193 | ------------ | |
1194 | ||
1195 | 1. The ${readsocket expansion item now supports Internet domain sockets as well | |
1196 | as Unix domain sockets. If the first argument begins "inet:", it must be of | |
1197 | the form "inet:host:port". The port is mandatory; it may be a number or the | |
1198 | name of a TCP port in /etc/services. The host may be a name, or it may be an | |
1199 | IP address. An ip address may optionally be enclosed in square brackets. | |
1200 | This is best for IPv6 addresses. For example: | |
1201 | ||
1202 | ${readsocket{inet:[::1]:1234}{<request data>}... | |
1203 | ||
1204 | Only a single host name may be given, but if looking it up yield more than | |
1205 | one IP address, they are each tried in turn until a connection is made. Once | |
1206 | a connection has been made, the behaviour is as for ${readsocket with a Unix | |
1207 | domain socket. | |
1208 | ||
f7fd3850 PH |
1209 | 2. If a redirect router sets up file or pipe deliveries for more than one |
1210 | incoming address, and the relevant transport has batch_max set greater than | |
1211 | one, a batch delivery now occurs. | |
1212 | ||
d6629cdc PH |
1213 | 3. The appendfile transport has a new option called maildirfolder_create_regex. |
1214 | Its value is a regular expression. For a maildir delivery, this is matched | |
1215 | against the maildir directory; if it matches, Exim ensures that a | |
1216 | maildirfolder file is created alongside the new, cur, and tmp directories. | |
1217 | ||
1cce3af8 | 1218 | |
7e66e54d PH |
1219 | Version 4.61 |
1220 | ------------ | |
1221 | ||
4f578862 PH |
1222 | The documentation is up-to-date for the 4.61 release. Major new features since |
1223 | the 4.60 release are: | |
1224 | ||
1225 | . An option called disable_ipv6, to disable the use of IPv6 completely. | |
1226 | ||
1227 | . An increase in the number of ACL variables to 20 of each type. | |
1228 | ||
1229 | . A change to use $auth1, $auth2, and $auth3 in authenticators instead of $1, | |
1230 | $2, $3, (though those are still set) because the numeric variables get used | |
1231 | for other things in complicated expansions. | |
1232 | ||
843a41e8 | 1233 | . The default for rfc1413_query_timeout has been changed from 30s to 5s. |
4f578862 PH |
1234 | |
1235 | . It is possible to use setclassresources() on some BSD OS to control the | |
1236 | resources used in pipe deliveries. | |
1237 | ||
1238 | . A new ACL modifier called add_header, which can be used with any verb. | |
1239 | ||
1240 | . More errors are detectable in retry rules. | |
1241 | ||
1242 | There are a number of other additions too. | |
71fafd95 | 1243 | |
7e66e54d | 1244 | |
425ae40f | 1245 | Version 4.60 |
b5aea5e1 PH |
1246 | ------------ |
1247 | ||
425ae40f PH |
1248 | The documentation is up-to-date for the 4.60 release. Major new features since |
1249 | the 4.50 release are: | |
1a46a8c5 | 1250 | |
425ae40f | 1251 | . Support for SQLite. |
1a46a8c5 | 1252 | |
425ae40f | 1253 | . Support for IGNOREQUOTA in LMTP. |
1a46a8c5 | 1254 | |
425ae40f | 1255 | . Extensions to the "submission mode" features. |
1a46a8c5 | 1256 | |
425ae40f | 1257 | . Support for Client SMTP Authorization (CSA). |
1a46a8c5 | 1258 | |
425ae40f | 1259 | . Support for ratelimiting hosts and users. |
b5aea5e1 | 1260 | |
425ae40f | 1261 | . New expansion items to help with the BATV "prvs" scheme. |
b5aea5e1 | 1262 | |
425ae40f | 1263 | . A "match_ip" condition, that matches an IP address against a list. |
35edf2ff | 1264 | |
425ae40f | 1265 | There are many more minor changes. |
495ae4b0 PH |
1266 | |
1267 | **** |