Typo & nit fixes.
[exim.git] / doc / doc-txt / NewStuff
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1New Features in Exim
2--------------------
3
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4This file contains descriptions of new features that have been added to Exim.
5Before a formal release, there may be quite a lot of detail so that people can
6test from the snapshots or the CVS before the documentation is updated. Once
7the documentation is updated, this file is reduced to a short list.
8
2c422e6f 9Version 4.82
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10------------
11
12 1. New command-line option -bI:sieve will list all supported sieve extensions
13 of this Exim build on standard output, one per line.
14 ManageSieve (RFC 5804) providers managing scripts for use by Exim should
15 query this to establish the correct list to include in the protocol's
16 SIEVE capability line.
17
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18 2. If the -n option is combined with the -bP option, then the name of an
19 emitted option is not output, only the value (if visible to you).
20 For instance, "exim -n -bP pid_file_path" should just emit a pathname
21 followed by a newline, and no other text.
22
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23 3. When built with SUPPORT_TLS and USE_GNUTLS, the SMTP transport driver now
24 has a "tls_dh_min_bits" option, to set the minimum acceptable number of
25 bits in the Diffie-Hellman prime offered by a server (in DH ciphersuites)
26 acceptable for security. (Option accepted but ignored if using OpenSSL).
27 Defaults to 1024, the old value. May be lowered only to 512, or raised as
28 far as you like. Raising this may hinder TLS interoperability with other
29 sites and is not currently recommended. Lowering this will permit you to
30 establish a TLS session which is not as secure as you might like.
31
32 Unless you really know what you are doing, leave it alone.
33
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34 4. If not built with DISABLE_DNSSEC, Exim now has the main option
35 dns_use_dnssec; if set to 1 then Exim will initialise the resolver library
36 to send the DO flag to your recursive resolver. If you have a recursive
37 resolver, which can set the Authenticated Data (AD) flag in results, Exim
38 can now detect this.
39
40 Current status: work-in-progress; $sender_host_dnssec variable added.
41
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42 5. DSCP support for outbound connections: on a transport using the smtp driver,
43 set "dscp = ef", for instance, to cause the connections to have the relevant
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44 DSCP (IPv4 TOS or IPv6 TCLASS) value in the header.
45
46 Similarly for inbound connections, there is a new control modifier, dscp,
47 so "warn control = dscp/ef" in the connect ACL, or after authentication.
48
49 Supported values depend upon system libraries. "exim -bI:dscp" to list the
50 ones Exim knows of. You can also set a raw number 0..0x3F.
36a3ae5f 51
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52 6. The -G command-line flag is no longer ignored; it is now equivalent to an
53 ACL setting "control = suppress_local_fixups". The -L command-line flag
54 is now accepted and forces use of syslog, with the provided tag as the
55 process name. A few other flags used by Sendmail are now accepted and
56 ignored.
57
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58 7. New cutthrough routing feature. Requested by a "control = cutthrough_delivery"
59 ACL modifier; works for single-recipient mails which are recieved on and
60 deliverable via SMTP. Using the connection made for a recipient verify,
61 if requested before the verify, or a new one made for the purpose while
62 the inbound connection is still active. The bulk of the mail item is copied
63 direct from the inbound socket to the outbound (as well as the spool file).
64 When the source notifies the end of data, the data acceptance by the destination
65 is negociated before the acceptance is sent to the source. If the destination
66 does not accept the mail item, for example due to content-scanning, the item
67 is not accepted from the source and therefore there is no need to generate
68 a bounce mail. This is of benefit when providing a secondary-MX service.
69 The downside is that delays are under the control of the ultimate destination
70 system not your own.
71
72 The Recieved-by: header on items delivered by cutthrough is generated
042eb971 73 early in reception rather than at the end; this will affect any timestamp
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74 included. The log line showing delivery is recorded before that showing
75 reception; it uses a new ">>" tag instead of "=>".
06a6f4ed 76
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77 To support the feature, verify-callout connections can now use ESMTP and TLS.
78 The usual smtp transport options are honoured, plus a (new, default everything)
79 hosts_verify_avoid_tls.
80
81 New variable families named tls_in_cipher, tls_out_cipher etc. are introduced
82 for specific access to the information for each connection. The old names
83 are present for now but deprecated.
84
85 Not yet supported: IGNOREQUOTA, SIZE, PIPELINING, AUTH.
86
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87 8. New expansion operators ${listnamed:name} to get the content of a named list
88 and ${listcount:string} to count the items in a list.
98a90c36 89
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90 9. New global option "gnutls_enable_pkcs11", defaults false. The GnuTLS
91 rewrite in 4.80 combines with GnuTLS 2.12.0 or later, to autoload PKCS11
92 modules. For some situations this is desirable, but we expect admin in
93 those situations to know they want the feature. More commonly, it means
94 that GUI user modules get loaded and are broken by the setuid Exim being
95 unable to access files specified in environment variables and passed
96 through, thus breakage. So we explicitly inhibit the PKCS11 initialisation
97 unless this new option is set.
98
3e8abda0 9910. The "acl = name" condition on an ACL now supports optional arguments.
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100 New expansion item "${acl {name}{arg}...}" and expansion condition
101 "acl {{name}{arg}...}" are added. In all cases up to nine arguments
102 can be used, appearing in $acl_arg1 to $acl_arg9 for the called ACL.
103 Variable $acl_narg contains the number of arguments. If the ACL sets
104 a "message =" value this becomes the result of the expansion item,
105 or the value of $value for the expansion condition. If the ACL returns
106 accept the expansion condition is true; if reject, false. A defer
107 return results in a forced fail.
a5f239e4 108
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10911. Routers and transports can now have multiple headers_add and headers_remove
110 option lines. The concatenated list is used.
111
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11212. New ACL modifier "remove_header" can remove headers before message gets
113 handled by routers/transports.
114
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11513. New dnsdb lookup pseudo-type "a+". A sequence of "a6" (if configured),
116 "aaaa" and "a" lookups is done and the full set of results returned.
117
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11814. New expansion variable $headers_added with content from ACL add_header
119 modifier (but not yet added to messsage).
120
bd0fff00 12115. New 8bitmime status logging option for received messages. Log field "M8S".
3c0a92dc 122
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12316. New authenticated_sender logging option, adding to log field "A".
124
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12517. New expansion variables $router_name and $transport_name. Useful
126 particularly for debug_print as -bt commandline option does not
2a47f028 127 require privilege whereas -d does.
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128
129
b1770b6e 130Version 4.80
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131------------
132
133 1. New authenticator driver, "gsasl". Server-only (at present).
134 This is a SASL interface, licensed under GPL, which can be found at
135 http://www.gnu.org/software/gsasl/.
136 This system does not provide sources of data for authentication, so
3b4f55a3 137 careful use needs to be made of the conditions in Exim.
c1e794ba 138
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139 2. New authenticator driver, "heimdal_gssapi". Server-only.
140 A replacement for using cyrus_sasl with Heimdal, now that $KRB5_KTNAME
141 is no longer honoured for setuid programs by Heimdal. Use the
142 "server_keytab" option to point to the keytab.
143
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144 3. The "pkg-config" system can now be used when building Exim to reference
145 cflags and library information for lookups and authenticators, rather
146 than having to update "CFLAGS", "AUTH_LIBS", "LOOKUP_INCLUDE" and
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147 "LOOKUP_LIBS" directly. Similarly for handling the TLS library support
148 without adjusting "TLS_INCLUDE" and "TLS_LIBS".
252e0c7b 149
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150 In addition, setting PCRE_CONFIG=yes will query the pcre-config tool to
151 find the headers and libraries for PCRE.
152
f1e05cc7 153 4. New expansion variable $tls_bits.
20aa9dbd 154
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155 5. New lookup type, "dbmjz". Key is an Exim list, the elements of which will
156 be joined together with ASCII NUL characters to construct the key to pass
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157 into the DBM library. Can be used with gsasl to access sasldb2 files as
158 used by Cyrus SASL.
4a6a987a 159
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160 6. OpenSSL now supports TLS1.1 and TLS1.2 with OpenSSL 1.0.1.
161
162 Avoid release 1.0.1a if you can. Note that the default value of
163 "openssl_options" is no longer "+dont_insert_empty_fragments", as that
164 increased susceptibility to attack. This may still have interoperability
165 implications for very old clients (see version 4.31 change 37) but
166 administrators can choose to make the trade-off themselves and restore
167 compatibility at the cost of session security.
168
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169 7. Use of the new expansion variable $tls_sni in the main configuration option
170 tls_certificate will cause Exim to re-expand the option, if the client
171 sends the TLS Server Name Indication extension, to permit choosing a
172 different certificate; tls_privatekey will also be re-expanded. You must
173 still set these options to expand to valid files when $tls_sni is not set.
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174
175 The SMTP Transport has gained the option tls_sni, which will set a hostname
176 for outbound TLS sessions, and set $tls_sni too.
177
178 A new log_selector, +tls_sni, has been added, to log received SNI values
179 for Exim as a server.
180
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181 8. The existing "accept_8bitmime" option now defaults to true. This means
182 that Exim is deliberately not strictly RFC compliant. We're following
183 Dan Bernstein's advice in http://cr.yp.to/smtp/8bitmime.html by default.
184 Those who disagree, or know that they are talking to mail servers that,
185 even today, are not 8-bit clean, need to turn off this option.
186
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187 9. Exim can now be started with -bw (with an optional timeout, given as
188 -bw<timespec>). With this, stdin at startup is a socket that is
189 already listening for connections. This has a more modern name of
190 "socket activation", but forcing the activated socket to fd 0. We're
191 interested in adding more support for modern variants.
192
eae0036b 19310. ${eval } now uses 64-bit values on supporting platforms. A new "G" suffix
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194 for numbers indicates multiplication by 1024^3.
195
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19611. The GnuTLS support has been revamped; the three options gnutls_require_kx,
197 gnutls_require_mac & gnutls_require_protocols are no longer supported.
198 tls_require_ciphers is now parsed by gnutls_priority_init(3) as a priority
199 string, documentation for which is at:
200 http://www.gnu.org/software/gnutls/manual/html_node/Priority-Strings.html
201
202 SNI support has been added to Exim's GnuTLS integration too.
203
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204 For sufficiently recent GnuTLS libraries, ${randint:..} will now use
205 gnutls_rnd(), asking for GNUTLS_RND_NONCE level randomness.
206
53947857 20712. With OpenSSL, if built with EXPERIMENTAL_OCSP, a new option tls_ocsp_file
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208 is now available. If the contents of the file are valid, then Exim will
209 send that back in response to a TLS status request; this is OCSP Stapling.
210 Exim will not maintain the contents of the file in any way: administrators
211 are responsible for ensuring that it is up-to-date.
212
213 See "experimental-spec.txt" for more details.
214
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21513. ${lookup dnsdb{ }} supports now SPF record types. They are handled
216 identically to TXT record lookups.
217
2605c55b 21814. New expansion variable $tod_epoch_l for higher-precision time.
c1e794ba 219
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22015. New global option tls_dh_max_bits, defaulting to current value of NSS
221 hard-coded limit of DH ephemeral bits, to fix interop problems caused by
222 GnuTLS 2.12 library recommending a bit count higher than NSS supports.
223
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22416. tls_dhparam now used by both OpenSSL and GnuTLS, can be path or identifier.
225 Option can now be a path or an identifier for a standard prime.
226 If unset, we use the DH prime from section 2.2 of RFC 5114, "ike23".
227 Set to "historic" to get the old GnuTLS behaviour of auto-generated DH
228 primes.
229
3ecab157 23017. SSLv2 now disabled by default in OpenSSL. (Never supported by GnuTLS).
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231 Use "openssl_options -no_sslv2" to re-enable support, if your OpenSSL
232 install was not built with OPENSSL_NO_SSL2 ("no-ssl2").
233
9e45c72b 234
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235Version 4.77
236------------
237
238 1. New options for the ratelimit ACL condition: /count= and /unique=.
239 The /noupdate option has been replaced by a /readonly option.
240
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241 2. The SMTP transport's protocol option may now be set to "smtps", to
242 use SSL-on-connect outbound.
243
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244 3. New variable $av_failed, set true if the AV scanner deferred; ie, when
245 there is a problem talking to the AV scanner, or the AV scanner running.
246
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247 4. New expansion conditions, "inlist" and "inlisti", which take simple lists
248 and check if the search item is a member of the list. This does not
249 support named lists, but does subject the list part to string expansion.
250
251 5. Unless the new EXPAND_LISTMATCH_RHS build option is set when Exim was
252 built, Exim no longer performs string expansion on the second string of
253 the match_* expansion conditions: "match_address", "match_domain",
254 "match_ip" & "match_local_part". Named lists can still be used.
255
7c6d71af 256
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257Version 4.76
258------------
259
260 1. The global option "dns_use_edns0" may be set to coerce EDNS0 usage on
261 or off in the resolver library.
262
263
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264Version 4.75
265------------
266
267 1. In addition to the existing LDAP and LDAP/SSL ("ldaps") support, there
268 is now LDAP/TLS support, given sufficiently modern OpenLDAP client
269 libraries. The following global options have been added in support of
270 this: ldap_ca_cert_dir, ldap_ca_cert_file, ldap_cert_file, ldap_cert_key,
271 ldap_cipher_suite, ldap_require_cert, ldap_start_tls.
272
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273 2. The pipe transport now takes a boolean option, "freeze_signal", default
274 false. When true, if the external delivery command exits on a signal then
275 Exim will freeze the message in the queue, instead of generating a bounce.
276
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277 3. Log filenames may now use %M as an escape, instead of %D (still available).
278 The %M pattern expands to yyyymm, providing month-level resolution.
279
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280 4. The $message_linecount variable is now updated for the maildir_tag option,
281 in the same way as $message_size, to reflect the real number of lines,
282 including any header additions or removals from transport.
283
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284 5. When contacting a pool of SpamAssassin servers configured in spamd_address,
285 Exim now selects entries randomly, to better scale in a cluster setup.
286
bc19a55b 287
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288Version 4.74
289------------
290
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291 1. SECURITY FIX: privilege escalation flaw fixed. On Linux (and only Linux)
292 the flaw permitted the Exim run-time user to cause root to append to
293 arbitrary files of the attacker's choosing, with the content based
294 on content supplied by the attacker.
295
296 2. Exim now supports loading some lookup types at run-time, using your
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297 platform's dlopen() functionality. This has limited platform support
298 and the intention is not to support every variant, it's limited to
299 dlopen(). This permits the main Exim binary to not be linked against
300 all the libraries needed for all the lookup types.
301
302
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303Version 4.73
304------------
305
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306 NOTE: this version is not guaranteed backwards-compatible, please read the
307 items below carefully
308
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309 1. A new main configuration option, "openssl_options", is available if Exim
310 is built with SSL support provided by OpenSSL. The option allows
311 administrators to specify OpenSSL options to be used on connections;
312 typically this is to set bug compatibility features which the OpenSSL
313 developers have not enabled by default. There may be security
314 consequences for certain options, so these should not be changed
315 frivolously.
316
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317 2. A new pipe transport option, "permit_coredumps", may help with problem
318 diagnosis in some scenarios. Note that Exim is typically installed as
319 a setuid binary, which on most OSes will inhibit coredumps by default,
43236f35 320 so that safety mechanism would have to be overridden for this option to
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321 be able to take effect.
322
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323 3. ClamAV 0.95 is now required for ClamAV support in Exim, unless
324 Local/Makefile sets: WITH_OLD_CLAMAV_STREAM=yes
325 Note that this switches Exim to use a new API ("INSTREAM") and a future
326 release of ClamAV will remove support for the old API ("STREAM").
327
328 The av_scanner option, when set to "clamd", now takes an optional third
329 part, "local", which causes Exim to pass a filename to ClamAV instead of
330 the file content. This is the same behaviour as when clamd is pointed at
331 a Unix-domain socket. For example:
332
333 av_scanner = clamd:192.0.2.3 1234:local
334
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335 ClamAV's ExtendedDetectionInfo response format is now handled.
336
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337 4. There is now a -bmalware option, restricted to admin users. This option
338 takes one parameter, a filename, and scans that file with Exim's
339 malware-scanning framework. This is intended purely as a debugging aid
340 to ensure that Exim's scanning is working, not to replace other tools.
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341 Note that the ACL framework is not invoked, so if av_scanner references
342 ACL variables without a fallback then this will fail.
8544e77a 343
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344 5. There is a new expansion operator, "reverse_ip", which will reverse IP
345 addresses; IPv4 into dotted quad, IPv6 into dotted nibble. Examples:
346
347 ${reverse_ip:192.0.2.4}
348 -> 4.2.0.192
349 ${reverse_ip:2001:0db8:c42:9:1:abcd:192.0.2.3}
350 -> 3.0.2.0.0.0.0.c.d.c.b.a.1.0.0.0.9.0.0.0.2.4.c.0.8.b.d.0.1.0.0.2
351
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352 6. There is a new ACL control called "debug", to enable debug logging.
353 This allows selective logging of certain incoming transactions within
354 production environments, with some care. It takes two options, "tag"
355 and "opts"; "tag" is included in the filename of the log and "opts"
356 is used as per the -d<options> command-line option. Examples, which
357 don't all make sense in all contexts:
358
359 control = debug
360 control = debug/tag=.$sender_host_address
361 control = debug/opts=+expand+acl
362 control = debug/tag=.$message_exim_id/opts=+expand
363
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364 7. It has always been implicit in the design and the documentation that
365 "the Exim user" is not root. src/EDITME said that using root was
366 "very strongly discouraged". This is not enough to keep people from
367 shooting themselves in the foot in days when many don't configure Exim
368 themselves but via package build managers. The security consequences of
369 running various bits of network code are severe if there should be bugs in
370 them. As such, the Exim user may no longer be root. If configured
371 statically, Exim will refuse to build. If configured as ref:user then Exim
372 will exit shortly after start-up. If you must shoot yourself in the foot,
373 then henceforth you will have to maintain your own local patches to strip
374 the safeties off.
375
06a6f4ed 376 8. There is a new expansion condition, bool_lax{}. Where bool{} uses the ACL
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377 condition logic to determine truth/failure and will fail to expand many
378 strings, bool_lax{} uses the router condition logic, where most strings
379 do evaluate true.
380 Note: bool{00} is false, bool_lax{00} is true.
381
06a6f4ed 382 9. Routers now support multiple "condition" tests.
532be449 383
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38410. There is now a runtime configuration option "tcp_wrappers_daemon_name".
385 Setting this allows an admin to define which entry in the tcpwrappers
386 config file will be used to control access to the daemon. This option
387 is only available when Exim is built with USE_TCP_WRAPPERS. The
388 default value is set at build time using the TCP_WRAPPERS_DAEMON_NAME
389 build option.
390
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39111. [POSSIBLE CONFIG BREAKAGE] The default value for system_filter_user is now
392 the Exim run-time user, instead of root.
393
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39412. [POSSIBLE CONFIG BREAKAGE] ALT_CONFIG_ROOT_ONLY is no longer optional and
395 is forced on. This is mitigated by the new build option
90b6341f 396 TRUSTED_CONFIG_LIST which defines a list of configuration files which
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397 are trusted; one per line. If a config file is owned by root and matches
398 a pathname in the list, then it may be invoked by the Exim build-time
399 user without Exim relinquishing root privileges.
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400
40113. [POSSIBLE CONFIG BREAKAGE] The Exim user is no longer automatically
402 trusted to supply -D<Macro[=Value]> overrides on the command-line. Going
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403 forward, we recommend using TRUSTED_CONFIG_LIST with shim configs that
404 include the main config. As a transition mechanism, we are temporarily
405 providing a work-around: the new build option WHITELIST_D_MACROS provides
43236f35 406 a colon-separated list of macro names which may be overridden by the Exim
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407 run-time user. The values of these macros are constrained to the regex
408 ^[A-Za-z0-9_/.-]*$ (which explicitly does allow for empty values).
2cfd3221 409
77bb000f 410
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411Version 4.72
412------------
413
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414 1. TWO SECURITY FIXES: one relating to mail-spools which are globally
415 writable, the other to locking of MBX folders (not mbox).
416
417 2. MySQL stored procedures are now supported.
418
419 3. The dkim_domain transport option is now a list, not a single string, and
420 messages will be signed for each element in the list (discarding
421 duplicates).
422
423 4. The 4.70 release unexpectedly changed the behaviour of dnsdb TXT lookups
424 in the presence of multiple character strings within the RR. Prior to 4.70,
425 only the first string would be returned. The dnsdb lookup now, by default,
426 preserves the pre-4.70 semantics, but also now takes an extended output
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427 separator specification. The separator can be followed by a semicolon, to
428 concatenate the individual text strings together with no join character,
429 or by a comma and a second separator character, in which case the text
430 strings within a TXT record are joined on that second character.
431 Administrators are reminded that DNS provides no ordering guarantees
432 between multiple records in an RRset. For example:
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433
434 foo.example. IN TXT "a" "b" "c"
435 foo.example. IN TXT "d" "e" "f"
436
437 ${lookup dnsdb{>/ txt=foo.example}} -> "a/d"
438 ${lookup dnsdb{>/; txt=foo.example}} -> "def/abc"
8f425947 439 ${lookup dnsdb{>/,+ txt=foo.example}} -> "a+b+c/d+e+f"
b26eacf1 440
3fc596e4 441
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442Version 4.70 / 4.71
443-------------------
65a7d8c3 444
7c6d71af 445 1. Native DKIM support without an external library.
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446 (Note that if no action to prevent it is taken, a straight upgrade will
447 result in DKIM verification of all signed incoming emails. See spec
448 for details on conditionally disabling)
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449
450 2. Experimental DCC support via dccifd (contributed by Wolfgang Breyha).
65a7d8c3 451
f33253cc 452 3. There is now a bool{} expansion condition which maps certain strings to
7d9f747b 453 true/false condition values (most likely of use in conjunction with the
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454 and{} expansion operator).
455
456 4. The $spam_score, $spam_bar and $spam_report variables are now available
457 at delivery time.
458
459 5. exim -bP now supports "macros", "macro_list" or "macro MACRO_NAME" as
460 options, provided that Exim is invoked by an admin_user.
461
462 6. There is a new option gnutls_compat_mode, when linked against GnuTLS,
463 which increases compatibility with older clients at the cost of decreased
464 security. Don't set this unless you need to support such clients.
465
466 7. There is a new expansion operator, ${randint:...} which will produce a
467 "random" number less than the supplied integer. This randomness is
468 not guaranteed to be cryptographically strong, but depending upon how
469 Exim was built may be better than the most naive schemes.
470
471 8. Exim now explicitly ensures that SHA256 is available when linked against
472 OpenSSL.
473
474 9. The transport_filter_timeout option now applies to SMTP transports too.
475
65a7d8c3 476
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477Version 4.69
478------------
479
480 1. Preliminary DKIM support in Experimental.
481
482
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483Version 4.68
484------------
485
486 1. The body_linecount and body_zerocount C variables are now exported in the
487 local_scan API.
488
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489 2. When a dnslists lookup succeeds, the key that was looked up is now placed
490 in $dnslist_matched. When the key is an IP address, it is not reversed in
491 this variable (though it is, of course, in the actual lookup). In simple
492 cases, for example:
493
494 deny dnslists = spamhaus.example
495
496 the key is also available in another variable (in this case,
497 $sender_host_address). In more complicated cases, however, this is not
498 true. For example, using a data lookup might generate a dnslists lookup
499 like this:
500
501 deny dnslists = spamhaus.example/<|192.168.1.2|192.168.6.7|...
502
503 If this condition succeeds, the value in $dnslist_matched might be
504 192.168.6.7 (for example).
505
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506 3. Authenticators now have a client_condition option. When Exim is running as
507 a client, it skips an authenticator whose client_condition expansion yields
508 "0", "no", or "false". This can be used, for example, to skip plain text
509 authenticators when the connection is not encrypted by a setting such as:
510
511 client_condition = ${if !eq{$tls_cipher}{}}
512
513 Note that the 4.67 documentation states that $tls_cipher contains the
514 cipher used for incoming messages. In fact, during SMTP delivery, it
515 contains the cipher used for the delivery. The same is true for
516 $tls_peerdn.
517
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518 4. There is now a -Mvc <message-id> option, which outputs a copy of the
519 message to the standard output, in RFC 2822 format. The option can be used
520 only by an admin user.
521
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522 5. There is now a /noupdate option for the ratelimit ACL condition. It
523 computes the rate and checks the limit as normal, but it does not update
524 the saved data. This means that, in relevant ACLs, it is possible to lookup
525 the existence of a specified (or auto-generated) ratelimit key without
526 incrementing the ratelimit counter for that key.
527
528 In order for this to be useful, another ACL entry must set the rate
529 for the same key somewhere (otherwise it will always be zero).
530
531 Example:
532
533 acl_check_connect:
534 # Read the rate; if it doesn't exist or is below the maximum
535 # we update it below
536 deny ratelimit = 100 / 5m / strict / noupdate
537 log_message = RATE: $sender_rate / $sender_rate_period \
538 (max $sender_rate_limit)
539
540 [... some other logic and tests...]
541
542 warn ratelimit = 100 / 5m / strict / per_cmd
543 log_message = RATE UPDATE: $sender_rate / $sender_rate_period \
544 (max $sender_rate_limit)
545 condition = ${if le{$sender_rate}{$sender_rate_limit}}
546
547 accept
548
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549 6. The variable $max_received_linelength contains the number of bytes in the
550 longest line that was received as part of the message, not counting the
551 line termination character(s).
552
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553 7. Host lists can now include +ignore_defer and +include_defer, analagous to
554 +ignore_unknown and +include_unknown. These options should be used with
555 care, probably only in non-critical host lists such as whitelists.
556
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557 8. There's a new option called queue_only_load_latch, which defaults true.
558 If set false when queue_only_load is greater than zero, Exim re-evaluates
559 the load for each incoming message in an SMTP session. Otherwise, once one
560 message is queued, the remainder are also.
561
4f054c63 562 9. There is a new ACL, specified by acl_smtp_notquit, which is run in most
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563 cases when an SMTP session ends without sending QUIT. However, when Exim
564 itself is is bad trouble, such as being unable to write to its log files,
565 this ACL is not run, because it might try to do things (such as write to
566 log files) that make the situation even worse.
567
568 Like the QUIT ACL, this new ACL is provided to make it possible to gather
569 statistics. Whatever it returns (accept or deny) is immaterial. The "delay"
570 modifier is forbidden in this ACL.
571
572 When the NOTQUIT ACL is running, the variable $smtp_notquit_reason is set
573 to a string that indicates the reason for the termination of the SMTP
574 connection. The possible values are:
575
576 acl-drop Another ACL issued a "drop" command
577 bad-commands Too many unknown or non-mail commands
578 command-timeout Timeout while reading SMTP commands
579 connection-lost The SMTP connection has been lost
580 data-timeout Timeout while reading message data
581 local-scan-error The local_scan() function crashed
582 local-scan-timeout The local_scan() function timed out
583 signal-exit SIGTERM or SIGINT
584 synchronization-error SMTP synchronization error
585 tls-failed TLS failed to start
586
587 In most cases when an SMTP connection is closed without having received
588 QUIT, Exim sends an SMTP response message before actually closing the
589 connection. With the exception of acl-drop, the default message can be
590 overridden by the "message" modifier in the NOTQUIT ACL. In the case of a
591 "drop" verb in another ACL, it is the message from the other ACL that is
592 used.
593
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59410. For MySQL and PostgreSQL lookups, it is now possible to specify a list of
595 servers with individual queries. This is done by starting the query with
596 "servers=x:y:z;", where each item in the list may take one of two forms:
597
598 (1) If it is just a host name, the appropriate global option (mysql_servers
599 or pgsql_servers) is searched for a host of the same name, and the
600 remaining parameters (database, user, password) are taken from there.
601
602 (2) If it contains any slashes, it is taken as a complete parameter set.
603
604 The list of servers is used in exactly the same was as the global list.
605 Once a connection to a server has happened and a query has been
606 successfully executed, processing of the lookup ceases.
607
608 This feature is intended for use in master/slave situations where updates
609 are occurring, and one wants to update a master rather than a slave. If the
610 masters are in the list for reading, you might have:
611
612 mysql_servers = slave1/db/name/pw:slave2/db/name/pw:master/db/name/pw
613
614 In an updating lookup, you could then write
615
616 ${lookup mysql{servers=master; UPDATE ...}
617
618 If, on the other hand, the master is not to be used for reading lookups:
619
620 pgsql_servers = slave1/db/name/pw:slave2/db/name/pw
621
622 you can still update the master by
623
624 ${lookup pgsql{servers=master/db/name/pw; UPDATE ...}
625
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62611. The message_body_newlines option (default FALSE, for backwards
627 compatibility) can be used to control whether newlines are present in
628 $message_body and $message_body_end. If it is FALSE, they are replaced by
629 spaces.
630
2b85bce7 631
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632Version 4.67
633------------
634
635 1. There is a new log selector called smtp_no_mail, which is not included in
636 the default setting. When it is set, a line is written to the main log
637 whenever an accepted SMTP connection terminates without having issued a
4aa45c31 638 MAIL command.
b4ed4da0 639
431b7361 640 2. When an item in a dnslists list is followed by = and & and a list of IP
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641 addresses, the behaviour was not clear when the lookup returned more than
642 one IP address. This has been solved by the addition of == and =& for "all"
93655c46 643 rather than the default "any" matching.
431b7361 644
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645 3. Up till now, the only control over which cipher suites GnuTLS uses has been
646 for the cipher algorithms. New options have been added to allow some of the
647 other parameters to be varied.
431b7361 648
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649 4. There is a new compile-time option called ENABLE_DISABLE_FSYNC. When it is
650 set, Exim compiles a runtime option called disable_fsync.
431b7361 651
4aa45c31 652 5. There is a new variable called $smtp_count_at_connection_start.
431b7361 653
4aa45c31 654 6. There's a new control called no_pipelining.
cf8b11a5 655
41c7c167 656 7. There are two new variables called $sending_ip_address and $sending_port.
4aa45c31 657 These are set whenever an SMTP connection to another host has been set up.
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658
659 8. The expansion of the helo_data option in the smtp transport now happens
4aa45c31 660 after the connection to the server has been made.
41c7c167 661
9c57cbc0 662 9. There is a new expansion operator ${rfc2047d: that decodes strings that
4aa45c31 663 are encoded as per RFC 2047.
9c57cbc0 664
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66510. There is a new log selector called "pid", which causes the current process
666 id to be added to every log line, in square brackets, immediately after the
667 time and date.
668
047bdd8c 66911. Exim has been modified so that it flushes SMTP output before implementing
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670 a delay in an ACL. It also flushes the output before performing a callout,
671 as this can take a substantial time. These behaviours can be disabled by
672 obeying control = no_delay_flush or control = no_callout_flush,
4aa45c31 673 respectively, at some earlier stage of the connection.
047bdd8c 674
0ce9abe6 67512. There are two new expansion conditions that iterate over a list. They are
4aa45c31 676 called forany and forall.
0ce9abe6 677
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67813. There's a new global option called dsn_from that can be used to vary the
679 contents of From: lines in bounces and other automatically generated
680 messages ("delivery status notifications" - hence the name of the option).
0e22dfd1 681
4aa45c31 68214. The smtp transport has a new option called hosts_avoid_pipelining.
c51b8e75 683
75b1493f 68415. By default, exigrep does case-insensitive matches. There is now a -I option
4aa45c31 685 that makes it case-sensitive.
29f89cad 686
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68716. A number of new features ("addresses", "map", "filter", and "reduce") have
688 been added to string expansions to make it easier to process lists of
689 items, typically addresses.
29f89cad 690
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69117. There's a new ACL modifier called "continue". It does nothing of itself,
692 and processing of the ACL always continues with the next condition or
693 modifier. It is provided so that the side effects of expanding its argument
4aa45c31 694 can be used.
c3611384 695
ec95d1a6 69618. It is now possible to use newline and other control characters (those with
4aa45c31 697 values less than 32, plus DEL) as separators in lists.
ec95d1a6 698
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69919. The exigrep utility now has a -v option, which inverts the matching
700 condition.
701
c456d9bb 70220. The host_find_failed option in the manualroute router can now be set to
4aa45c31 703 "ignore".
c456d9bb 704
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705
706Version 4.66
707------------
708
709No new features were added to 4.66.
710
711
712Version 4.65
713------------
714
715No new features were added to 4.65.
716
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717
718Version 4.64
719------------
720
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721 1. ACL variables can now be given arbitrary names, as long as they start with
722 "acl_c" or "acl_m" (for connection variables and message variables), are at
723 least six characters long, with the sixth character being either a digit or
883335dc 724 an underscore.
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725
726 2. There is a new ACL modifier called log_reject_target. It makes it possible
883335dc 727 to specify which logs are used for messages about ACL rejections.
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728
729 3. There is a new authenticator called "dovecot". This is an interface to the
730 authentication facility of the Dovecot POP/IMAP server, which can support a
883335dc 731 number of authentication methods.
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732
733 4. The variable $message_headers_raw provides a concatenation of all the
734 messages's headers without any decoding. This is in contrast to
735 $message_headers, which does RFC2047 decoding on the header contents.
736
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737 5. In a DNS black list, if two domain names, comma-separated, are given, the
738 second is used first to do an initial check, making use of any IP value
739 restrictions that are set. If there is a match, the first domain is used,
740 without any IP value restrictions, to get the TXT record.
af561417 741
883335dc 742 6. All authenticators now have a server_condition option.
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743
744 7. There is a new command-line option called -Mset. It is useful only in
745 conjunction with -be (that is, when testing string expansions). It must be
746 followed by a message id; Exim loads the given message from its spool
883335dc 747 before doing the expansions.
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748
749 8. Another similar new command-line option is called -bem. It operates like
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750 -be except that it must be followed by the name of a file that contains a
751 message.
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752
753 9. When an address is delayed because of a 4xx response to a RCPT command, it
754 is now the combination of sender and recipient that is delayed in
883335dc 755 subsequent queue runs until its retry time is reached.
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756
75710. Unary negation and the bitwise logical operators and, or, xor, not, and
883335dc 758 shift, have been added to the eval: and eval10: expansion items.
48c7f9e2 759
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76011. The variables $interface_address and $interface_port have been renamed
761 as $received_ip_address and $received_port, to make it clear that they
762 relate to message reception rather than delivery. (The old names remain
763 available for compatibility.)
764
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76512. The "message" modifier can now be used on "accept" and "discard" acl verbs
766 to vary the message that is sent when an SMTP command is accepted.
4e88a19f 767
495ae4b0 768
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769Version 4.63
770------------
771
7721. There is a new Boolean option called filter_prepend_home for the redirect
38a0a95f 773 router.
4608d683 774
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7752. There is a new acl, set by acl_not_smtp_start, which is run right at the
776 start of receiving a non-SMTP message, before any of the message has been
38a0a95f 777 read.
45b91596 778
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7793. When an SMTP error message is specified in a "message" modifier in an ACL,
780 or in a :fail: or :defer: message in a redirect router, Exim now checks the
38a0a95f 781 start of the message for an SMTP error code.
a5bd321b 782
6ec97b1b 7834. There is a new parameter for LDAP lookups called "referrals", which takes
38a0a95f 784 one of the settings "follow" (the default) or "nofollow".
6ec97b1b 785
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7865. Version 20070721.2 of exipick now included, offering these new options:
787 --reverse
788 After all other sorting options have bee processed, reverse order
789 before displaying messages (-R is synonym).
790 --random
791 Randomize order of matching messages before displaying.
792 --size
793 Instead of displaying the matching messages, display the sum
794 of their sizes.
795 --sort <variable>[,<variable>...]
796 Before displaying matching messages, sort the messages according to
797 each messages value for each variable.
798 --not
799 Negate the value for every test (returns inverse output from the
800 same criteria without --not).
801
4608d683 802
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803Version 4.62
804------------
805
8061. The ${readsocket expansion item now supports Internet domain sockets as well
807 as Unix domain sockets. If the first argument begins "inet:", it must be of
808 the form "inet:host:port". The port is mandatory; it may be a number or the
809 name of a TCP port in /etc/services. The host may be a name, or it may be an
810 IP address. An ip address may optionally be enclosed in square brackets.
811 This is best for IPv6 addresses. For example:
812
813 ${readsocket{inet:[::1]:1234}{<request data>}...
814
815 Only a single host name may be given, but if looking it up yield more than
816 one IP address, they are each tried in turn until a connection is made. Once
817 a connection has been made, the behaviour is as for ${readsocket with a Unix
818 domain socket.
819
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8202. If a redirect router sets up file or pipe deliveries for more than one
821 incoming address, and the relevant transport has batch_max set greater than
822 one, a batch delivery now occurs.
823
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8243. The appendfile transport has a new option called maildirfolder_create_regex.
825 Its value is a regular expression. For a maildir delivery, this is matched
826 against the maildir directory; if it matches, Exim ensures that a
827 maildirfolder file is created alongside the new, cur, and tmp directories.
828
1cce3af8 829
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830Version 4.61
831------------
832
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833The documentation is up-to-date for the 4.61 release. Major new features since
834the 4.60 release are:
835
836. An option called disable_ipv6, to disable the use of IPv6 completely.
837
838. An increase in the number of ACL variables to 20 of each type.
839
840. A change to use $auth1, $auth2, and $auth3 in authenticators instead of $1,
841 $2, $3, (though those are still set) because the numeric variables get used
842 for other things in complicated expansions.
843
843a41e8 844. The default for rfc1413_query_timeout has been changed from 30s to 5s.
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845
846. It is possible to use setclassresources() on some BSD OS to control the
847 resources used in pipe deliveries.
848
849. A new ACL modifier called add_header, which can be used with any verb.
850
851. More errors are detectable in retry rules.
852
853There are a number of other additions too.
71fafd95 854
7e66e54d 855
425ae40f 856Version 4.60
b5aea5e1
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857------------
858
425ae40f
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859The documentation is up-to-date for the 4.60 release. Major new features since
860the 4.50 release are:
1a46a8c5 861
425ae40f 862. Support for SQLite.
1a46a8c5 863
425ae40f 864. Support for IGNOREQUOTA in LMTP.
1a46a8c5 865
425ae40f 866. Extensions to the "submission mode" features.
1a46a8c5 867
425ae40f 868. Support for Client SMTP Authorization (CSA).
1a46a8c5 869
425ae40f 870. Support for ratelimiting hosts and users.
b5aea5e1 871
425ae40f 872. New expansion items to help with the BATV "prvs" scheme.
b5aea5e1 873
425ae40f 874. A "match_ip" condition, that matches an IP address against a list.
35edf2ff 875
425ae40f 876There are many more minor changes.
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877
878****