Multiple headers_add/remove options per router/transport - fixes bug 337
[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
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9Version 4.81
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 "=>".
76
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
b1770b6e 112Version 4.80
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113------------
114
115 1. New authenticator driver, "gsasl". Server-only (at present).
116 This is a SASL interface, licensed under GPL, which can be found at
117 http://www.gnu.org/software/gsasl/.
118 This system does not provide sources of data for authentication, so
3b4f55a3 119 careful use needs to be made of the conditions in Exim.
c1e794ba 120
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121 2. New authenticator driver, "heimdal_gssapi". Server-only.
122 A replacement for using cyrus_sasl with Heimdal, now that $KRB5_KTNAME
123 is no longer honoured for setuid programs by Heimdal. Use the
124 "server_keytab" option to point to the keytab.
125
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126 3. The "pkg-config" system can now be used when building Exim to reference
127 cflags and library information for lookups and authenticators, rather
128 than having to update "CFLAGS", "AUTH_LIBS", "LOOKUP_INCLUDE" and
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129 "LOOKUP_LIBS" directly. Similarly for handling the TLS library support
130 without adjusting "TLS_INCLUDE" and "TLS_LIBS".
252e0c7b 131
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132 In addition, setting PCRE_CONFIG=yes will query the pcre-config tool to
133 find the headers and libraries for PCRE.
134
f1e05cc7 135 4. New expansion variable $tls_bits.
20aa9dbd 136
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137 5. New lookup type, "dbmjz". Key is an Exim list, the elements of which will
138 be joined together with ASCII NUL characters to construct the key to pass
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139 into the DBM library. Can be used with gsasl to access sasldb2 files as
140 used by Cyrus SASL.
4a6a987a 141
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142 6. OpenSSL now supports TLS1.1 and TLS1.2 with OpenSSL 1.0.1.
143
144 Avoid release 1.0.1a if you can. Note that the default value of
145 "openssl_options" is no longer "+dont_insert_empty_fragments", as that
146 increased susceptibility to attack. This may still have interoperability
147 implications for very old clients (see version 4.31 change 37) but
148 administrators can choose to make the trade-off themselves and restore
149 compatibility at the cost of session security.
150
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151 7. Use of the new expansion variable $tls_sni in the main configuration option
152 tls_certificate will cause Exim to re-expand the option, if the client
153 sends the TLS Server Name Indication extension, to permit choosing a
154 different certificate; tls_privatekey will also be re-expanded. You must
155 still set these options to expand to valid files when $tls_sni is not set.
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156
157 The SMTP Transport has gained the option tls_sni, which will set a hostname
158 for outbound TLS sessions, and set $tls_sni too.
159
160 A new log_selector, +tls_sni, has been added, to log received SNI values
161 for Exim as a server.
162
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163 8. The existing "accept_8bitmime" option now defaults to true. This means
164 that Exim is deliberately not strictly RFC compliant. We're following
165 Dan Bernstein's advice in http://cr.yp.to/smtp/8bitmime.html by default.
166 Those who disagree, or know that they are talking to mail servers that,
167 even today, are not 8-bit clean, need to turn off this option.
168
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169 9. Exim can now be started with -bw (with an optional timeout, given as
170 -bw<timespec>). With this, stdin at startup is a socket that is
171 already listening for connections. This has a more modern name of
172 "socket activation", but forcing the activated socket to fd 0. We're
173 interested in adding more support for modern variants.
174
eae0036b 17510. ${eval } now uses 64-bit values on supporting platforms. A new "G" suffix
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176 for numbers indicates multiplication by 1024^3.
177
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17811. The GnuTLS support has been revamped; the three options gnutls_require_kx,
179 gnutls_require_mac & gnutls_require_protocols are no longer supported.
180 tls_require_ciphers is now parsed by gnutls_priority_init(3) as a priority
181 string, documentation for which is at:
182 http://www.gnu.org/software/gnutls/manual/html_node/Priority-Strings.html
183
184 SNI support has been added to Exim's GnuTLS integration too.
185
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186 For sufficiently recent GnuTLS libraries, ${randint:..} will now use
187 gnutls_rnd(), asking for GNUTLS_RND_NONCE level randomness.
188
53947857 18912. With OpenSSL, if built with EXPERIMENTAL_OCSP, a new option tls_ocsp_file
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190 is now available. If the contents of the file are valid, then Exim will
191 send that back in response to a TLS status request; this is OCSP Stapling.
192 Exim will not maintain the contents of the file in any way: administrators
193 are responsible for ensuring that it is up-to-date.
194
195 See "experimental-spec.txt" for more details.
196
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19713. ${lookup dnsdb{ }} supports now SPF record types. They are handled
198 identically to TXT record lookups.
199
2605c55b 20014. New expansion variable $tod_epoch_l for higher-precision time.
c1e794ba 201
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20215. New global option tls_dh_max_bits, defaulting to current value of NSS
203 hard-coded limit of DH ephemeral bits, to fix interop problems caused by
204 GnuTLS 2.12 library recommending a bit count higher than NSS supports.
205
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20616. tls_dhparam now used by both OpenSSL and GnuTLS, can be path or identifier.
207 Option can now be a path or an identifier for a standard prime.
208 If unset, we use the DH prime from section 2.2 of RFC 5114, "ike23".
209 Set to "historic" to get the old GnuTLS behaviour of auto-generated DH
210 primes.
211
3ecab157 21217. SSLv2 now disabled by default in OpenSSL. (Never supported by GnuTLS).
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213 Use "openssl_options -no_sslv2" to re-enable support, if your OpenSSL
214 install was not built with OPENSSL_NO_SSL2 ("no-ssl2").
215
9e45c72b 216
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217Version 4.77
218------------
219
220 1. New options for the ratelimit ACL condition: /count= and /unique=.
221 The /noupdate option has been replaced by a /readonly option.
222
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223 2. The SMTP transport's protocol option may now be set to "smtps", to
224 use SSL-on-connect outbound.
225
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226 3. New variable $av_failed, set true if the AV scanner deferred; ie, when
227 there is a problem talking to the AV scanner, or the AV scanner running.
228
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229 4. New expansion conditions, "inlist" and "inlisti", which take simple lists
230 and check if the search item is a member of the list. This does not
231 support named lists, but does subject the list part to string expansion.
232
233 5. Unless the new EXPAND_LISTMATCH_RHS build option is set when Exim was
234 built, Exim no longer performs string expansion on the second string of
235 the match_* expansion conditions: "match_address", "match_domain",
236 "match_ip" & "match_local_part". Named lists can still be used.
237
7c6d71af 238
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239Version 4.76
240------------
241
242 1. The global option "dns_use_edns0" may be set to coerce EDNS0 usage on
243 or off in the resolver library.
244
245
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246Version 4.75
247------------
248
249 1. In addition to the existing LDAP and LDAP/SSL ("ldaps") support, there
250 is now LDAP/TLS support, given sufficiently modern OpenLDAP client
251 libraries. The following global options have been added in support of
252 this: ldap_ca_cert_dir, ldap_ca_cert_file, ldap_cert_file, ldap_cert_key,
253 ldap_cipher_suite, ldap_require_cert, ldap_start_tls.
254
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255 2. The pipe transport now takes a boolean option, "freeze_signal", default
256 false. When true, if the external delivery command exits on a signal then
257 Exim will freeze the message in the queue, instead of generating a bounce.
258
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259 3. Log filenames may now use %M as an escape, instead of %D (still available).
260 The %M pattern expands to yyyymm, providing month-level resolution.
261
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262 4. The $message_linecount variable is now updated for the maildir_tag option,
263 in the same way as $message_size, to reflect the real number of lines,
264 including any header additions or removals from transport.
265
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266 5. When contacting a pool of SpamAssassin servers configured in spamd_address,
267 Exim now selects entries randomly, to better scale in a cluster setup.
268
bc19a55b 269
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270Version 4.74
271------------
272
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273 1. SECURITY FIX: privilege escalation flaw fixed. On Linux (and only Linux)
274 the flaw permitted the Exim run-time user to cause root to append to
275 arbitrary files of the attacker's choosing, with the content based
276 on content supplied by the attacker.
277
278 2. Exim now supports loading some lookup types at run-time, using your
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279 platform's dlopen() functionality. This has limited platform support
280 and the intention is not to support every variant, it's limited to
281 dlopen(). This permits the main Exim binary to not be linked against
282 all the libraries needed for all the lookup types.
283
284
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285Version 4.73
286------------
287
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288 NOTE: this version is not guaranteed backwards-compatible, please read the
289 items below carefully
290
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291 1. A new main configuration option, "openssl_options", is available if Exim
292 is built with SSL support provided by OpenSSL. The option allows
293 administrators to specify OpenSSL options to be used on connections;
294 typically this is to set bug compatibility features which the OpenSSL
295 developers have not enabled by default. There may be security
296 consequences for certain options, so these should not be changed
297 frivolously.
298
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299 2. A new pipe transport option, "permit_coredumps", may help with problem
300 diagnosis in some scenarios. Note that Exim is typically installed as
301 a setuid binary, which on most OSes will inhibit coredumps by default,
43236f35 302 so that safety mechanism would have to be overridden for this option to
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303 be able to take effect.
304
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305 3. ClamAV 0.95 is now required for ClamAV support in Exim, unless
306 Local/Makefile sets: WITH_OLD_CLAMAV_STREAM=yes
307 Note that this switches Exim to use a new API ("INSTREAM") and a future
308 release of ClamAV will remove support for the old API ("STREAM").
309
310 The av_scanner option, when set to "clamd", now takes an optional third
311 part, "local", which causes Exim to pass a filename to ClamAV instead of
312 the file content. This is the same behaviour as when clamd is pointed at
313 a Unix-domain socket. For example:
314
315 av_scanner = clamd:192.0.2.3 1234:local
316
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317 ClamAV's ExtendedDetectionInfo response format is now handled.
318
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319 4. There is now a -bmalware option, restricted to admin users. This option
320 takes one parameter, a filename, and scans that file with Exim's
321 malware-scanning framework. This is intended purely as a debugging aid
322 to ensure that Exim's scanning is working, not to replace other tools.
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323 Note that the ACL framework is not invoked, so if av_scanner references
324 ACL variables without a fallback then this will fail.
8544e77a 325
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326 5. There is a new expansion operator, "reverse_ip", which will reverse IP
327 addresses; IPv4 into dotted quad, IPv6 into dotted nibble. Examples:
328
329 ${reverse_ip:192.0.2.4}
330 -> 4.2.0.192
331 ${reverse_ip:2001:0db8:c42:9:1:abcd:192.0.2.3}
332 -> 3.0.2.0.0.0.0.c.d.c.b.a.1.0.0.0.9.0.0.0.2.4.c.0.8.b.d.0.1.0.0.2
333
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334 6. There is a new ACL control called "debug", to enable debug logging.
335 This allows selective logging of certain incoming transactions within
336 production environments, with some care. It takes two options, "tag"
337 and "opts"; "tag" is included in the filename of the log and "opts"
338 is used as per the -d<options> command-line option. Examples, which
339 don't all make sense in all contexts:
340
341 control = debug
342 control = debug/tag=.$sender_host_address
343 control = debug/opts=+expand+acl
344 control = debug/tag=.$message_exim_id/opts=+expand
345
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346 7. It has always been implicit in the design and the documentation that
347 "the Exim user" is not root. src/EDITME said that using root was
348 "very strongly discouraged". This is not enough to keep people from
349 shooting themselves in the foot in days when many don't configure Exim
350 themselves but via package build managers. The security consequences of
351 running various bits of network code are severe if there should be bugs in
352 them. As such, the Exim user may no longer be root. If configured
353 statically, Exim will refuse to build. If configured as ref:user then Exim
354 will exit shortly after start-up. If you must shoot yourself in the foot,
355 then henceforth you will have to maintain your own local patches to strip
356 the safeties off.
357
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358 8. There is a new expansion operator, bool_lax{}. Where bool{} uses the ACL
359 condition logic to determine truth/failure and will fail to expand many
360 strings, bool_lax{} uses the router condition logic, where most strings
361 do evaluate true.
362 Note: bool{00} is false, bool_lax{00} is true.
363
364 9. Routers now support multiple "condition" tests,
532be449 365
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36610. There is now a runtime configuration option "tcp_wrappers_daemon_name".
367 Setting this allows an admin to define which entry in the tcpwrappers
368 config file will be used to control access to the daemon. This option
369 is only available when Exim is built with USE_TCP_WRAPPERS. The
370 default value is set at build time using the TCP_WRAPPERS_DAEMON_NAME
371 build option.
372
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37311. [POSSIBLE CONFIG BREAKAGE] The default value for system_filter_user is now
374 the Exim run-time user, instead of root.
375
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37612. [POSSIBLE CONFIG BREAKAGE] ALT_CONFIG_ROOT_ONLY is no longer optional and
377 is forced on. This is mitigated by the new build option
90b6341f 378 TRUSTED_CONFIG_LIST which defines a list of configuration files which
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379 are trusted; one per line. If a config file is owned by root and matches
380 a pathname in the list, then it may be invoked by the Exim build-time
381 user without Exim relinquishing root privileges.
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382
38313. [POSSIBLE CONFIG BREAKAGE] The Exim user is no longer automatically
384 trusted to supply -D<Macro[=Value]> overrides on the command-line. Going
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385 forward, we recommend using TRUSTED_CONFIG_LIST with shim configs that
386 include the main config. As a transition mechanism, we are temporarily
387 providing a work-around: the new build option WHITELIST_D_MACROS provides
43236f35 388 a colon-separated list of macro names which may be overridden by the Exim
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389 run-time user. The values of these macros are constrained to the regex
390 ^[A-Za-z0-9_/.-]*$ (which explicitly does allow for empty values).
2cfd3221 391
77bb000f 392
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393Version 4.72
394------------
395
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396 1. TWO SECURITY FIXES: one relating to mail-spools which are globally
397 writable, the other to locking of MBX folders (not mbox).
398
399 2. MySQL stored procedures are now supported.
400
401 3. The dkim_domain transport option is now a list, not a single string, and
402 messages will be signed for each element in the list (discarding
403 duplicates).
404
405 4. The 4.70 release unexpectedly changed the behaviour of dnsdb TXT lookups
406 in the presence of multiple character strings within the RR. Prior to 4.70,
407 only the first string would be returned. The dnsdb lookup now, by default,
408 preserves the pre-4.70 semantics, but also now takes an extended output
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409 separator specification. The separator can be followed by a semicolon, to
410 concatenate the individual text strings together with no join character,
411 or by a comma and a second separator character, in which case the text
412 strings within a TXT record are joined on that second character.
413 Administrators are reminded that DNS provides no ordering guarantees
414 between multiple records in an RRset. For example:
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415
416 foo.example. IN TXT "a" "b" "c"
417 foo.example. IN TXT "d" "e" "f"
418
419 ${lookup dnsdb{>/ txt=foo.example}} -> "a/d"
420 ${lookup dnsdb{>/; txt=foo.example}} -> "def/abc"
8f425947 421 ${lookup dnsdb{>/,+ txt=foo.example}} -> "a+b+c/d+e+f"
b26eacf1 422
3fc596e4 423
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424Version 4.70 / 4.71
425-------------------
65a7d8c3 426
7c6d71af 427 1. Native DKIM support without an external library.
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428 (Note that if no action to prevent it is taken, a straight upgrade will
429 result in DKIM verification of all signed incoming emails. See spec
430 for details on conditionally disabling)
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431
432 2. Experimental DCC support via dccifd (contributed by Wolfgang Breyha).
65a7d8c3 433
f33253cc 434 3. There is now a bool{} expansion condition which maps certain strings to
7d9f747b 435 true/false condition values (most likely of use in conjunction with the
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436 and{} expansion operator).
437
438 4. The $spam_score, $spam_bar and $spam_report variables are now available
439 at delivery time.
440
441 5. exim -bP now supports "macros", "macro_list" or "macro MACRO_NAME" as
442 options, provided that Exim is invoked by an admin_user.
443
444 6. There is a new option gnutls_compat_mode, when linked against GnuTLS,
445 which increases compatibility with older clients at the cost of decreased
446 security. Don't set this unless you need to support such clients.
447
448 7. There is a new expansion operator, ${randint:...} which will produce a
449 "random" number less than the supplied integer. This randomness is
450 not guaranteed to be cryptographically strong, but depending upon how
451 Exim was built may be better than the most naive schemes.
452
453 8. Exim now explicitly ensures that SHA256 is available when linked against
454 OpenSSL.
455
456 9. The transport_filter_timeout option now applies to SMTP transports too.
457
65a7d8c3 458
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459Version 4.69
460------------
461
462 1. Preliminary DKIM support in Experimental.
463
464
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465Version 4.68
466------------
467
468 1. The body_linecount and body_zerocount C variables are now exported in the
469 local_scan API.
470
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471 2. When a dnslists lookup succeeds, the key that was looked up is now placed
472 in $dnslist_matched. When the key is an IP address, it is not reversed in
473 this variable (though it is, of course, in the actual lookup). In simple
474 cases, for example:
475
476 deny dnslists = spamhaus.example
477
478 the key is also available in another variable (in this case,
479 $sender_host_address). In more complicated cases, however, this is not
480 true. For example, using a data lookup might generate a dnslists lookup
481 like this:
482
483 deny dnslists = spamhaus.example/<|192.168.1.2|192.168.6.7|...
484
485 If this condition succeeds, the value in $dnslist_matched might be
486 192.168.6.7 (for example).
487
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488 3. Authenticators now have a client_condition option. When Exim is running as
489 a client, it skips an authenticator whose client_condition expansion yields
490 "0", "no", or "false". This can be used, for example, to skip plain text
491 authenticators when the connection is not encrypted by a setting such as:
492
493 client_condition = ${if !eq{$tls_cipher}{}}
494
495 Note that the 4.67 documentation states that $tls_cipher contains the
496 cipher used for incoming messages. In fact, during SMTP delivery, it
497 contains the cipher used for the delivery. The same is true for
498 $tls_peerdn.
499
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500 4. There is now a -Mvc <message-id> option, which outputs a copy of the
501 message to the standard output, in RFC 2822 format. The option can be used
502 only by an admin user.
503
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504 5. There is now a /noupdate option for the ratelimit ACL condition. It
505 computes the rate and checks the limit as normal, but it does not update
506 the saved data. This means that, in relevant ACLs, it is possible to lookup
507 the existence of a specified (or auto-generated) ratelimit key without
508 incrementing the ratelimit counter for that key.
509
510 In order for this to be useful, another ACL entry must set the rate
511 for the same key somewhere (otherwise it will always be zero).
512
513 Example:
514
515 acl_check_connect:
516 # Read the rate; if it doesn't exist or is below the maximum
517 # we update it below
518 deny ratelimit = 100 / 5m / strict / noupdate
519 log_message = RATE: $sender_rate / $sender_rate_period \
520 (max $sender_rate_limit)
521
522 [... some other logic and tests...]
523
524 warn ratelimit = 100 / 5m / strict / per_cmd
525 log_message = RATE UPDATE: $sender_rate / $sender_rate_period \
526 (max $sender_rate_limit)
527 condition = ${if le{$sender_rate}{$sender_rate_limit}}
528
529 accept
530
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531 6. The variable $max_received_linelength contains the number of bytes in the
532 longest line that was received as part of the message, not counting the
533 line termination character(s).
534
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535 7. Host lists can now include +ignore_defer and +include_defer, analagous to
536 +ignore_unknown and +include_unknown. These options should be used with
537 care, probably only in non-critical host lists such as whitelists.
538
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539 8. There's a new option called queue_only_load_latch, which defaults true.
540 If set false when queue_only_load is greater than zero, Exim re-evaluates
541 the load for each incoming message in an SMTP session. Otherwise, once one
542 message is queued, the remainder are also.
543
4f054c63 544 9. There is a new ACL, specified by acl_smtp_notquit, which is run in most
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545 cases when an SMTP session ends without sending QUIT. However, when Exim
546 itself is is bad trouble, such as being unable to write to its log files,
547 this ACL is not run, because it might try to do things (such as write to
548 log files) that make the situation even worse.
549
550 Like the QUIT ACL, this new ACL is provided to make it possible to gather
551 statistics. Whatever it returns (accept or deny) is immaterial. The "delay"
552 modifier is forbidden in this ACL.
553
554 When the NOTQUIT ACL is running, the variable $smtp_notquit_reason is set
555 to a string that indicates the reason for the termination of the SMTP
556 connection. The possible values are:
557
558 acl-drop Another ACL issued a "drop" command
559 bad-commands Too many unknown or non-mail commands
560 command-timeout Timeout while reading SMTP commands
561 connection-lost The SMTP connection has been lost
562 data-timeout Timeout while reading message data
563 local-scan-error The local_scan() function crashed
564 local-scan-timeout The local_scan() function timed out
565 signal-exit SIGTERM or SIGINT
566 synchronization-error SMTP synchronization error
567 tls-failed TLS failed to start
568
569 In most cases when an SMTP connection is closed without having received
570 QUIT, Exim sends an SMTP response message before actually closing the
571 connection. With the exception of acl-drop, the default message can be
572 overridden by the "message" modifier in the NOTQUIT ACL. In the case of a
573 "drop" verb in another ACL, it is the message from the other ACL that is
574 used.
575
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57610. For MySQL and PostgreSQL lookups, it is now possible to specify a list of
577 servers with individual queries. This is done by starting the query with
578 "servers=x:y:z;", where each item in the list may take one of two forms:
579
580 (1) If it is just a host name, the appropriate global option (mysql_servers
581 or pgsql_servers) is searched for a host of the same name, and the
582 remaining parameters (database, user, password) are taken from there.
583
584 (2) If it contains any slashes, it is taken as a complete parameter set.
585
586 The list of servers is used in exactly the same was as the global list.
587 Once a connection to a server has happened and a query has been
588 successfully executed, processing of the lookup ceases.
589
590 This feature is intended for use in master/slave situations where updates
591 are occurring, and one wants to update a master rather than a slave. If the
592 masters are in the list for reading, you might have:
593
594 mysql_servers = slave1/db/name/pw:slave2/db/name/pw:master/db/name/pw
595
596 In an updating lookup, you could then write
597
598 ${lookup mysql{servers=master; UPDATE ...}
599
600 If, on the other hand, the master is not to be used for reading lookups:
601
602 pgsql_servers = slave1/db/name/pw:slave2/db/name/pw
603
604 you can still update the master by
605
606 ${lookup pgsql{servers=master/db/name/pw; UPDATE ...}
607
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60811. The message_body_newlines option (default FALSE, for backwards
609 compatibility) can be used to control whether newlines are present in
610 $message_body and $message_body_end. If it is FALSE, they are replaced by
611 spaces.
612
2b85bce7 613
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614Version 4.67
615------------
616
617 1. There is a new log selector called smtp_no_mail, which is not included in
618 the default setting. When it is set, a line is written to the main log
619 whenever an accepted SMTP connection terminates without having issued a
4aa45c31 620 MAIL command.
b4ed4da0 621
431b7361 622 2. When an item in a dnslists list is followed by = and & and a list of IP
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623 addresses, the behaviour was not clear when the lookup returned more than
624 one IP address. This has been solved by the addition of == and =& for "all"
93655c46 625 rather than the default "any" matching.
431b7361 626
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627 3. Up till now, the only control over which cipher suites GnuTLS uses has been
628 for the cipher algorithms. New options have been added to allow some of the
629 other parameters to be varied.
431b7361 630
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631 4. There is a new compile-time option called ENABLE_DISABLE_FSYNC. When it is
632 set, Exim compiles a runtime option called disable_fsync.
431b7361 633
4aa45c31 634 5. There is a new variable called $smtp_count_at_connection_start.
431b7361 635
4aa45c31 636 6. There's a new control called no_pipelining.
cf8b11a5 637
41c7c167 638 7. There are two new variables called $sending_ip_address and $sending_port.
4aa45c31 639 These are set whenever an SMTP connection to another host has been set up.
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640
641 8. The expansion of the helo_data option in the smtp transport now happens
4aa45c31 642 after the connection to the server has been made.
41c7c167 643
9c57cbc0 644 9. There is a new expansion operator ${rfc2047d: that decodes strings that
4aa45c31 645 are encoded as per RFC 2047.
9c57cbc0 646
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64710. There is a new log selector called "pid", which causes the current process
648 id to be added to every log line, in square brackets, immediately after the
649 time and date.
650
047bdd8c 65111. Exim has been modified so that it flushes SMTP output before implementing
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652 a delay in an ACL. It also flushes the output before performing a callout,
653 as this can take a substantial time. These behaviours can be disabled by
654 obeying control = no_delay_flush or control = no_callout_flush,
4aa45c31 655 respectively, at some earlier stage of the connection.
047bdd8c 656
0ce9abe6 65712. There are two new expansion conditions that iterate over a list. They are
4aa45c31 658 called forany and forall.
0ce9abe6 659
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66013. There's a new global option called dsn_from that can be used to vary the
661 contents of From: lines in bounces and other automatically generated
662 messages ("delivery status notifications" - hence the name of the option).
0e22dfd1 663
4aa45c31 66414. The smtp transport has a new option called hosts_avoid_pipelining.
c51b8e75 665
75b1493f 66615. By default, exigrep does case-insensitive matches. There is now a -I option
4aa45c31 667 that makes it case-sensitive.
29f89cad 668
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66916. A number of new features ("addresses", "map", "filter", and "reduce") have
670 been added to string expansions to make it easier to process lists of
671 items, typically addresses.
29f89cad 672
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67317. There's a new ACL modifier called "continue". It does nothing of itself,
674 and processing of the ACL always continues with the next condition or
675 modifier. It is provided so that the side effects of expanding its argument
4aa45c31 676 can be used.
c3611384 677
ec95d1a6 67818. It is now possible to use newline and other control characters (those with
4aa45c31 679 values less than 32, plus DEL) as separators in lists.
ec95d1a6 680
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68119. The exigrep utility now has a -v option, which inverts the matching
682 condition.
683
c456d9bb 68420. The host_find_failed option in the manualroute router can now be set to
4aa45c31 685 "ignore".
c456d9bb 686
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687
688Version 4.66
689------------
690
691No new features were added to 4.66.
692
693
694Version 4.65
695------------
696
697No new features were added to 4.65.
698
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699
700Version 4.64
701------------
702
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703 1. ACL variables can now be given arbitrary names, as long as they start with
704 "acl_c" or "acl_m" (for connection variables and message variables), are at
705 least six characters long, with the sixth character being either a digit or
883335dc 706 an underscore.
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707
708 2. There is a new ACL modifier called log_reject_target. It makes it possible
883335dc 709 to specify which logs are used for messages about ACL rejections.
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710
711 3. There is a new authenticator called "dovecot". This is an interface to the
712 authentication facility of the Dovecot POP/IMAP server, which can support a
883335dc 713 number of authentication methods.
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714
715 4. The variable $message_headers_raw provides a concatenation of all the
716 messages's headers without any decoding. This is in contrast to
717 $message_headers, which does RFC2047 decoding on the header contents.
718
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719 5. In a DNS black list, if two domain names, comma-separated, are given, the
720 second is used first to do an initial check, making use of any IP value
721 restrictions that are set. If there is a match, the first domain is used,
722 without any IP value restrictions, to get the TXT record.
af561417 723
883335dc 724 6. All authenticators now have a server_condition option.
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725
726 7. There is a new command-line option called -Mset. It is useful only in
727 conjunction with -be (that is, when testing string expansions). It must be
728 followed by a message id; Exim loads the given message from its spool
883335dc 729 before doing the expansions.
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730
731 8. Another similar new command-line option is called -bem. It operates like
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732 -be except that it must be followed by the name of a file that contains a
733 message.
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734
735 9. When an address is delayed because of a 4xx response to a RCPT command, it
736 is now the combination of sender and recipient that is delayed in
883335dc 737 subsequent queue runs until its retry time is reached.
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738
73910. Unary negation and the bitwise logical operators and, or, xor, not, and
883335dc 740 shift, have been added to the eval: and eval10: expansion items.
48c7f9e2 741
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74211. The variables $interface_address and $interface_port have been renamed
743 as $received_ip_address and $received_port, to make it clear that they
744 relate to message reception rather than delivery. (The old names remain
745 available for compatibility.)
746
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74712. The "message" modifier can now be used on "accept" and "discard" acl verbs
748 to vary the message that is sent when an SMTP command is accepted.
4e88a19f 749
495ae4b0 750
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751Version 4.63
752------------
753
7541. There is a new Boolean option called filter_prepend_home for the redirect
38a0a95f 755 router.
4608d683 756
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7572. There is a new acl, set by acl_not_smtp_start, which is run right at the
758 start of receiving a non-SMTP message, before any of the message has been
38a0a95f 759 read.
45b91596 760
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7613. When an SMTP error message is specified in a "message" modifier in an ACL,
762 or in a :fail: or :defer: message in a redirect router, Exim now checks the
38a0a95f 763 start of the message for an SMTP error code.
a5bd321b 764
6ec97b1b 7654. There is a new parameter for LDAP lookups called "referrals", which takes
38a0a95f 766 one of the settings "follow" (the default) or "nofollow".
6ec97b1b 767
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7685. Version 20070721.2 of exipick now included, offering these new options:
769 --reverse
770 After all other sorting options have bee processed, reverse order
771 before displaying messages (-R is synonym).
772 --random
773 Randomize order of matching messages before displaying.
774 --size
775 Instead of displaying the matching messages, display the sum
776 of their sizes.
777 --sort <variable>[,<variable>...]
778 Before displaying matching messages, sort the messages according to
779 each messages value for each variable.
780 --not
781 Negate the value for every test (returns inverse output from the
782 same criteria without --not).
783
4608d683 784
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785Version 4.62
786------------
787
7881. The ${readsocket expansion item now supports Internet domain sockets as well
789 as Unix domain sockets. If the first argument begins "inet:", it must be of
790 the form "inet:host:port". The port is mandatory; it may be a number or the
791 name of a TCP port in /etc/services. The host may be a name, or it may be an
792 IP address. An ip address may optionally be enclosed in square brackets.
793 This is best for IPv6 addresses. For example:
794
795 ${readsocket{inet:[::1]:1234}{<request data>}...
796
797 Only a single host name may be given, but if looking it up yield more than
798 one IP address, they are each tried in turn until a connection is made. Once
799 a connection has been made, the behaviour is as for ${readsocket with a Unix
800 domain socket.
801
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8022. If a redirect router sets up file or pipe deliveries for more than one
803 incoming address, and the relevant transport has batch_max set greater than
804 one, a batch delivery now occurs.
805
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8063. The appendfile transport has a new option called maildirfolder_create_regex.
807 Its value is a regular expression. For a maildir delivery, this is matched
808 against the maildir directory; if it matches, Exim ensures that a
809 maildirfolder file is created alongside the new, cur, and tmp directories.
810
1cce3af8 811
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812Version 4.61
813------------
814
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815The documentation is up-to-date for the 4.61 release. Major new features since
816the 4.60 release are:
817
818. An option called disable_ipv6, to disable the use of IPv6 completely.
819
820. An increase in the number of ACL variables to 20 of each type.
821
822. A change to use $auth1, $auth2, and $auth3 in authenticators instead of $1,
823 $2, $3, (though those are still set) because the numeric variables get used
824 for other things in complicated expansions.
825
843a41e8 826. The default for rfc1413_query_timeout has been changed from 30s to 5s.
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827
828. It is possible to use setclassresources() on some BSD OS to control the
829 resources used in pipe deliveries.
830
831. A new ACL modifier called add_header, which can be used with any verb.
832
833. More errors are detectable in retry rules.
834
835There are a number of other additions too.
71fafd95 836
7e66e54d 837
425ae40f 838Version 4.60
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839------------
840
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841The documentation is up-to-date for the 4.60 release. Major new features since
842the 4.50 release are:
1a46a8c5 843
425ae40f 844. Support for SQLite.
1a46a8c5 845
425ae40f 846. Support for IGNOREQUOTA in LMTP.
1a46a8c5 847
425ae40f 848. Extensions to the "submission mode" features.
1a46a8c5 849
425ae40f 850. Support for Client SMTP Authorization (CSA).
1a46a8c5 851
425ae40f 852. Support for ratelimiting hosts and users.
b5aea5e1 853
425ae40f 854. New expansion items to help with the BATV "prvs" scheme.
b5aea5e1 855
425ae40f 856. A "match_ip" condition, that matches an IP address against a list.
35edf2ff 857
425ae40f 858There are many more minor changes.
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859
860****