Change notes for -bP
[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 4.87
10------------
11
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12 1. The ACL conditions regex and mime_regex now capture substrings
13 into numeric variables $regex1 to 9, like the "match" expansion condition.
14
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15 2. New $callout_address variable records the address used for a spam=,
16 malware= or verify= callout.
17
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18 3. Transports now take a "max_parallel" option, to limit concurrency.
19
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20 4. Expansion operators ${ipv6norm:<string>} and ${ipv6denorm:<string>}.
21 The latter expands to a 8-element colon-sep set of hex digits including
22 leading zeroes. A trailing ipv4-style dotted-decimal set is converted
23 to hex. Pure ipv4 addresses are converted to IPv4-mapped IPv6.
24 The former operator strips leading zeroes and collapses the longest
25 set of 0-groups to a double-colon.
26
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27 5. New "-bP config" support, to dump the effective configuration.
28
0d9b78be 29
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30Version 4.86
31------------
32
33 1. Support for using the system standard CA bundle.
34
35 2. New expansion items $config_file, $config_dir, containing the file
36 and directory name of the main configuration file. Also $exim_version.
37
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38 3. New "malware=" support for Avast.
39
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40 4. New "spam=" variant option for Rspamd.
41
42 5. Assorted options on malware= and spam= scanners.
43
44 6. A commandline option to write a comment into the logfile.
45
7eb6c37c 46 7. If built with EXPERIMENTAL_SOCKS feature enabled, the smtp transport can
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47 be configured to make connections via socks5 proxies.
48
49 8. If built with EXPERIMENTAL_INTERNATIONAL, support is included for
50 the transmission of UTF-8 envelope addresses.
7eb6c37c 51
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52 9. If built with EXPERIMENTAL_INTERNATIONAL, an expansion item for a commonly
53 used encoding of Maildir folder names.
54
b3ef41c9 5510. A logging option for slow DNS lookups.
846430d9 56
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5711. New ${env {<variable>}} expansion.
58
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5912. A non-SMTP authenticator using information from TLS client certificates.
60
10ca4f1c 6113. Main option "tls_eccurve" for selecting an Elliptic Curve for TLS.
65463bc9 62 Patch originally by Wolfgang Breyha.
10ca4f1c 63
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6414. Main option "dns_trust_aa" for trusting your local nameserver at the
65 same level as DNSSEC.
66
7eb6c37c 67
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68Version 4.85
69------------
70
71 1. If built with EXPERIMENTAL_DANE feature enabled, Exim will follow the
72 DANE smtp draft to assess a secure chain of trust of the certificate
73 used to establish the TLS connection based on a TLSA record in the
74 domain of the sender.
75
76 2. The EXPERIMENTAL_TPDA feature has been renamed to EXPERIMENTAL_EVENT
77 and several new events have been created. The reason is because it has
78 been expanded beyond just firing events during the transport phase. Any
79 existing TPDA transport options will have to be rewritten to use a new
80 $event_name expansion variable in a condition. Refer to the
81 experimental-spec.txt for details and examples.
82
83 3. The EXPERIMENTAL_CERTNAMES features is an enhancement to verify that
84 server certs used for TLS match the result of the MX lookup. It does
85 not use the same mechanism as DANE.
86
87
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88Version 4.84
89------------
90
91
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92Version 4.83
93------------
94
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95 1. If built with the EXPERIMENTAL_PROXY feature enabled, Exim can be
96 configured to expect an initial header from a proxy that will make the
97 actual external source IP:host be used in exim instead of the IP of the
98 proxy that is connecting to it.
99
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100 2. New verify option header_names_ascii, which will check to make sure
101 there are no non-ASCII characters in header names. Exim itself handles
102 those non-ASCII characters, but downstream apps may not, so Exim can
103 detect and reject if those characters are present.
104
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105 3. New expansion operator ${utf8clean:string} to replace malformed UTF8
106 codepoints with valid ones.
107
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108 4. New malware type "sock". Talks over a Unix or TCP socket, sending one
109 command line and matching a regex against the return data for trigger
007a2dee 110 and a second regex to extract malware_name. The mail spoolfile name can
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111 be included in the command line.
112
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113 5. The smtp transport now supports options "tls_verify_hosts" and
114 "tls_try_verify_hosts". If either is set the certificate verification
115 is split from the encryption operation. The default remains that a failed
116 verification cancels the encryption.
214042d2 117
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118 6. New SERVERS override of default ldap server list. In the ACLs, an ldap
119 lookup can now set a list of servers to use that is different from the
120 default list.
121
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122 7. New command-line option -C for exiqgrep to specify alternate exim.conf
123 file when searching the queue.
124
f2de3a33 125 8. OCSP now supports GnuTLS also, if you have version 3.1.3 or later of that.
2b4a568d 126
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127 9. Support for DNSSEC on outbound connections.
128
9d1c15ef 12910. New variables "tls_(in,out)_(our,peer)cert" and expansion item
6a8a60e0 130 "certextract" to extract fields from them. Hash operators md5 and sha1
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131 work over them for generating fingerprints, and a new sha256 operator
132 for them added.
9d1c15ef 133
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13411. PRDR is now supported dy default.
135
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13612. OCSP stapling is now supported by default.
137
13813. If built with the EXPERIMENTAL_DSN feature enabled, Exim will output
139 Delivery Status Notification messages in MIME format, and negociate
140 DSN features per RFC 3461.
141
6ece2e77 142
2c422e6f 143Version 4.82
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144------------
145
146 1. New command-line option -bI:sieve will list all supported sieve extensions
147 of this Exim build on standard output, one per line.
148 ManageSieve (RFC 5804) providers managing scripts for use by Exim should
149 query this to establish the correct list to include in the protocol's
150 SIEVE capability line.
151
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152 2. If the -n option is combined with the -bP option, then the name of an
153 emitted option is not output, only the value (if visible to you).
154 For instance, "exim -n -bP pid_file_path" should just emit a pathname
155 followed by a newline, and no other text.
156
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157 3. When built with SUPPORT_TLS and USE_GNUTLS, the SMTP transport driver now
158 has a "tls_dh_min_bits" option, to set the minimum acceptable number of
159 bits in the Diffie-Hellman prime offered by a server (in DH ciphersuites)
160 acceptable for security. (Option accepted but ignored if using OpenSSL).
161 Defaults to 1024, the old value. May be lowered only to 512, or raised as
162 far as you like. Raising this may hinder TLS interoperability with other
163 sites and is not currently recommended. Lowering this will permit you to
164 establish a TLS session which is not as secure as you might like.
165
166 Unless you really know what you are doing, leave it alone.
167
1f4a55da 168 4. If not built with DISABLE_DNSSEC, Exim now has the main option
0fbd9bff 169 dns_dnssec_ok; if set to 1 then Exim will initialise the resolver library
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170 to send the DO flag to your recursive resolver. If you have a recursive
171 resolver, which can set the Authenticated Data (AD) flag in results, Exim
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172 can now detect this. Exim does not perform validation itself, instead
173 relying upon a trusted path to the resolver.
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174
175 Current status: work-in-progress; $sender_host_dnssec variable added.
176
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177 5. DSCP support for outbound connections: on a transport using the smtp driver,
178 set "dscp = ef", for instance, to cause the connections to have the relevant
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179 DSCP (IPv4 TOS or IPv6 TCLASS) value in the header.
180
181 Similarly for inbound connections, there is a new control modifier, dscp,
182 so "warn control = dscp/ef" in the connect ACL, or after authentication.
183
184 Supported values depend upon system libraries. "exim -bI:dscp" to list the
185 ones Exim knows of. You can also set a raw number 0..0x3F.
36a3ae5f 186
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187 6. The -G command-line flag is no longer ignored; it is now equivalent to an
188 ACL setting "control = suppress_local_fixups". The -L command-line flag
189 is now accepted and forces use of syslog, with the provided tag as the
190 process name. A few other flags used by Sendmail are now accepted and
191 ignored.
192
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193 7. New cutthrough routing feature. Requested by a "control = cutthrough_delivery"
194 ACL modifier; works for single-recipient mails which are recieved on and
195 deliverable via SMTP. Using the connection made for a recipient verify,
196 if requested before the verify, or a new one made for the purpose while
197 the inbound connection is still active. The bulk of the mail item is copied
198 direct from the inbound socket to the outbound (as well as the spool file).
199 When the source notifies the end of data, the data acceptance by the destination
200 is negociated before the acceptance is sent to the source. If the destination
201 does not accept the mail item, for example due to content-scanning, the item
202 is not accepted from the source and therefore there is no need to generate
203 a bounce mail. This is of benefit when providing a secondary-MX service.
204 The downside is that delays are under the control of the ultimate destination
205 system not your own.
206
207 The Recieved-by: header on items delivered by cutthrough is generated
042eb971 208 early in reception rather than at the end; this will affect any timestamp
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209 included. The log line showing delivery is recorded before that showing
210 reception; it uses a new ">>" tag instead of "=>".
06a6f4ed 211
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212 To support the feature, verify-callout connections can now use ESMTP and TLS.
213 The usual smtp transport options are honoured, plus a (new, default everything)
214 hosts_verify_avoid_tls.
215
216 New variable families named tls_in_cipher, tls_out_cipher etc. are introduced
217 for specific access to the information for each connection. The old names
218 are present for now but deprecated.
219
fcc8e047 220 Not yet supported: IGNOREQUOTA, SIZE, PIPELINING.
976b7e9f 221
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222 8. New expansion operators ${listnamed:name} to get the content of a named list
223 and ${listcount:string} to count the items in a list.
98a90c36 224
2519e60d 225 9. New global option "gnutls_allow_auto_pkcs11", defaults false. The GnuTLS
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226 rewrite in 4.80 combines with GnuTLS 2.12.0 or later, to autoload PKCS11
227 modules. For some situations this is desirable, but we expect admin in
228 those situations to know they want the feature. More commonly, it means
229 that GUI user modules get loaded and are broken by the setuid Exim being
230 unable to access files specified in environment variables and passed
231 through, thus breakage. So we explicitly inhibit the PKCS11 initialisation
232 unless this new option is set.
233
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234 Some older OS's with earlier versions of GnuTLS might not have pkcs11 ability,
235 so have also added a build option which can be used to build Exim with GnuTLS
236 but without trying to use any kind of PKCS11 support. Uncomment this in the
237 Local/Makefile:
238
239 AVOID_GNUTLS_PKCS11=yes
240
3e8abda0 24110. The "acl = name" condition on an ACL now supports optional arguments.
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242 New expansion item "${acl {name}{arg}...}" and expansion condition
243 "acl {{name}{arg}...}" are added. In all cases up to nine arguments
244 can be used, appearing in $acl_arg1 to $acl_arg9 for the called ACL.
245 Variable $acl_narg contains the number of arguments. If the ACL sets
246 a "message =" value this becomes the result of the expansion item,
247 or the value of $value for the expansion condition. If the ACL returns
248 accept the expansion condition is true; if reject, false. A defer
249 return results in a forced fail.
a5f239e4 250
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25111. Routers and transports can now have multiple headers_add and headers_remove
252 option lines. The concatenated list is used.
253
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25412. New ACL modifier "remove_header" can remove headers before message gets
255 handled by routers/transports.
256
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25713. New dnsdb lookup pseudo-type "a+". A sequence of "a6" (if configured),
258 "aaaa" and "a" lookups is done and the full set of results returned.
259
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26014. New expansion variable $headers_added with content from ACL add_header
261 modifier (but not yet added to messsage).
262
bd0fff00 26315. New 8bitmime status logging option for received messages. Log field "M8S".
3c0a92dc 264
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26516. New authenticated_sender logging option, adding to log field "A".
266
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26717. New expansion variables $router_name and $transport_name. Useful
268 particularly for debug_print as -bt commandline option does not
2a47f028 269 require privilege whereas -d does.
181d9bf8 270
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27118. If built with EXPERIMENTAL_PRDR, per-recipient data responses per a
272 proposed extension to SMTP from Eric Hall.
273
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27419. The pipe transport has gained the force_command option, to allow
275 decorating commands from user .forward pipe aliases with prefix
276 wrappers, for instance.
277
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27820. Callout connections can now AUTH; the same controls as normal delivery
279 connections apply.
280
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28121. Support for DMARC, using opendmarc libs, can be enabled. It adds new
282 options: dmarc_forensic_sender, dmarc_history_file, and dmarc_tld_file.
283 It adds new expansion variables $dmarc_ar_header, $dmarc_status,
284 $dmarc_status_text, and $dmarc_used_domain. It adds a new acl modifier
285 dmarc_status. It adds new control flags dmarc_disable_verify and
286 dmarc_enable_forensic.
287
28822. Add expansion variable $authenticated_fail_id, which is the username
289 provided to the authentication method which failed. It is available
290 for use in subsequent ACL processing (typically quit or notquit ACLs).
291
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29223. New ACL modifer "udpsend" can construct a UDP packet to send to a given
293 UDP host and port.
294
29524. New ${hexquote:..string..} expansion operator converts non-printable
296 characters in the string to \xNN form.
297
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29825. Experimental TPDA (Transport Post Delivery Action) function added.
299 Patch provided by Axel Rau.
300
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30126. Experimental Redis lookup added. Patch provided by Warren Baker.
302
181d9bf8 303
b1770b6e 304Version 4.80
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305------------
306
307 1. New authenticator driver, "gsasl". Server-only (at present).
308 This is a SASL interface, licensed under GPL, which can be found at
309 http://www.gnu.org/software/gsasl/.
310 This system does not provide sources of data for authentication, so
3b4f55a3 311 careful use needs to be made of the conditions in Exim.
c1e794ba 312
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313 2. New authenticator driver, "heimdal_gssapi". Server-only.
314 A replacement for using cyrus_sasl with Heimdal, now that $KRB5_KTNAME
315 is no longer honoured for setuid programs by Heimdal. Use the
316 "server_keytab" option to point to the keytab.
317
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318 3. The "pkg-config" system can now be used when building Exim to reference
319 cflags and library information for lookups and authenticators, rather
320 than having to update "CFLAGS", "AUTH_LIBS", "LOOKUP_INCLUDE" and
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321 "LOOKUP_LIBS" directly. Similarly for handling the TLS library support
322 without adjusting "TLS_INCLUDE" and "TLS_LIBS".
252e0c7b 323
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324 In addition, setting PCRE_CONFIG=yes will query the pcre-config tool to
325 find the headers and libraries for PCRE.
326
f1e05cc7 327 4. New expansion variable $tls_bits.
20aa9dbd 328
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329 5. New lookup type, "dbmjz". Key is an Exim list, the elements of which will
330 be joined together with ASCII NUL characters to construct the key to pass
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331 into the DBM library. Can be used with gsasl to access sasldb2 files as
332 used by Cyrus SASL.
4a6a987a 333
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334 6. OpenSSL now supports TLS1.1 and TLS1.2 with OpenSSL 1.0.1.
335
336 Avoid release 1.0.1a if you can. Note that the default value of
337 "openssl_options" is no longer "+dont_insert_empty_fragments", as that
338 increased susceptibility to attack. This may still have interoperability
339 implications for very old clients (see version 4.31 change 37) but
340 administrators can choose to make the trade-off themselves and restore
341 compatibility at the cost of session security.
342
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343 7. Use of the new expansion variable $tls_sni in the main configuration option
344 tls_certificate will cause Exim to re-expand the option, if the client
345 sends the TLS Server Name Indication extension, to permit choosing a
346 different certificate; tls_privatekey will also be re-expanded. You must
347 still set these options to expand to valid files when $tls_sni is not set.
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348
349 The SMTP Transport has gained the option tls_sni, which will set a hostname
350 for outbound TLS sessions, and set $tls_sni too.
351
352 A new log_selector, +tls_sni, has been added, to log received SNI values
353 for Exim as a server.
354
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355 8. The existing "accept_8bitmime" option now defaults to true. This means
356 that Exim is deliberately not strictly RFC compliant. We're following
357 Dan Bernstein's advice in http://cr.yp.to/smtp/8bitmime.html by default.
358 Those who disagree, or know that they are talking to mail servers that,
359 even today, are not 8-bit clean, need to turn off this option.
360
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361 9. Exim can now be started with -bw (with an optional timeout, given as
362 -bw<timespec>). With this, stdin at startup is a socket that is
363 already listening for connections. This has a more modern name of
364 "socket activation", but forcing the activated socket to fd 0. We're
365 interested in adding more support for modern variants.
366
eae0036b 36710. ${eval } now uses 64-bit values on supporting platforms. A new "G" suffix
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368 for numbers indicates multiplication by 1024^3.
369
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37011. The GnuTLS support has been revamped; the three options gnutls_require_kx,
371 gnutls_require_mac & gnutls_require_protocols are no longer supported.
372 tls_require_ciphers is now parsed by gnutls_priority_init(3) as a priority
373 string, documentation for which is at:
42bfef1e 374 http://www.gnutls.org/manual/html_node/Priority-Strings.html
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375
376 SNI support has been added to Exim's GnuTLS integration too.
377
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378 For sufficiently recent GnuTLS libraries, ${randint:..} will now use
379 gnutls_rnd(), asking for GNUTLS_RND_NONCE level randomness.
380
53947857 38112. With OpenSSL, if built with EXPERIMENTAL_OCSP, a new option tls_ocsp_file
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382 is now available. If the contents of the file are valid, then Exim will
383 send that back in response to a TLS status request; this is OCSP Stapling.
384 Exim will not maintain the contents of the file in any way: administrators
385 are responsible for ensuring that it is up-to-date.
386
387 See "experimental-spec.txt" for more details.
388
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38913. ${lookup dnsdb{ }} supports now SPF record types. They are handled
390 identically to TXT record lookups.
391
2605c55b 39214. New expansion variable $tod_epoch_l for higher-precision time.
c1e794ba 393
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39415. New global option tls_dh_max_bits, defaulting to current value of NSS
395 hard-coded limit of DH ephemeral bits, to fix interop problems caused by
396 GnuTLS 2.12 library recommending a bit count higher than NSS supports.
397
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39816. tls_dhparam now used by both OpenSSL and GnuTLS, can be path or identifier.
399 Option can now be a path or an identifier for a standard prime.
400 If unset, we use the DH prime from section 2.2 of RFC 5114, "ike23".
401 Set to "historic" to get the old GnuTLS behaviour of auto-generated DH
402 primes.
403
3ecab157 40417. SSLv2 now disabled by default in OpenSSL. (Never supported by GnuTLS).
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405 Use "openssl_options -no_sslv2" to re-enable support, if your OpenSSL
406 install was not built with OPENSSL_NO_SSL2 ("no-ssl2").
407
9e45c72b 408
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409Version 4.77
410------------
411
412 1. New options for the ratelimit ACL condition: /count= and /unique=.
413 The /noupdate option has been replaced by a /readonly option.
414
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415 2. The SMTP transport's protocol option may now be set to "smtps", to
416 use SSL-on-connect outbound.
417
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418 3. New variable $av_failed, set true if the AV scanner deferred; ie, when
419 there is a problem talking to the AV scanner, or the AV scanner running.
420
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421 4. New expansion conditions, "inlist" and "inlisti", which take simple lists
422 and check if the search item is a member of the list. This does not
423 support named lists, but does subject the list part to string expansion.
424
425 5. Unless the new EXPAND_LISTMATCH_RHS build option is set when Exim was
426 built, Exim no longer performs string expansion on the second string of
427 the match_* expansion conditions: "match_address", "match_domain",
428 "match_ip" & "match_local_part". Named lists can still be used.
429
7c6d71af 430
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431Version 4.76
432------------
433
434 1. The global option "dns_use_edns0" may be set to coerce EDNS0 usage on
435 or off in the resolver library.
436
437
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438Version 4.75
439------------
440
441 1. In addition to the existing LDAP and LDAP/SSL ("ldaps") support, there
442 is now LDAP/TLS support, given sufficiently modern OpenLDAP client
443 libraries. The following global options have been added in support of
444 this: ldap_ca_cert_dir, ldap_ca_cert_file, ldap_cert_file, ldap_cert_key,
445 ldap_cipher_suite, ldap_require_cert, ldap_start_tls.
446
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447 2. The pipe transport now takes a boolean option, "freeze_signal", default
448 false. When true, if the external delivery command exits on a signal then
449 Exim will freeze the message in the queue, instead of generating a bounce.
450
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451 3. Log filenames may now use %M as an escape, instead of %D (still available).
452 The %M pattern expands to yyyymm, providing month-level resolution.
453
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454 4. The $message_linecount variable is now updated for the maildir_tag option,
455 in the same way as $message_size, to reflect the real number of lines,
456 including any header additions or removals from transport.
457
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458 5. When contacting a pool of SpamAssassin servers configured in spamd_address,
459 Exim now selects entries randomly, to better scale in a cluster setup.
460
bc19a55b 461
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462Version 4.74
463------------
464
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465 1. SECURITY FIX: privilege escalation flaw fixed. On Linux (and only Linux)
466 the flaw permitted the Exim run-time user to cause root to append to
467 arbitrary files of the attacker's choosing, with the content based
468 on content supplied by the attacker.
469
470 2. Exim now supports loading some lookup types at run-time, using your
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471 platform's dlopen() functionality. This has limited platform support
472 and the intention is not to support every variant, it's limited to
473 dlopen(). This permits the main Exim binary to not be linked against
474 all the libraries needed for all the lookup types.
475
476
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477Version 4.73
478------------
479
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480 NOTE: this version is not guaranteed backwards-compatible, please read the
481 items below carefully
482
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483 1. A new main configuration option, "openssl_options", is available if Exim
484 is built with SSL support provided by OpenSSL. The option allows
485 administrators to specify OpenSSL options to be used on connections;
486 typically this is to set bug compatibility features which the OpenSSL
487 developers have not enabled by default. There may be security
488 consequences for certain options, so these should not be changed
489 frivolously.
490
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491 2. A new pipe transport option, "permit_coredumps", may help with problem
492 diagnosis in some scenarios. Note that Exim is typically installed as
493 a setuid binary, which on most OSes will inhibit coredumps by default,
43236f35 494 so that safety mechanism would have to be overridden for this option to
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495 be able to take effect.
496
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497 3. ClamAV 0.95 is now required for ClamAV support in Exim, unless
498 Local/Makefile sets: WITH_OLD_CLAMAV_STREAM=yes
499 Note that this switches Exim to use a new API ("INSTREAM") and a future
500 release of ClamAV will remove support for the old API ("STREAM").
501
502 The av_scanner option, when set to "clamd", now takes an optional third
503 part, "local", which causes Exim to pass a filename to ClamAV instead of
504 the file content. This is the same behaviour as when clamd is pointed at
505 a Unix-domain socket. For example:
506
507 av_scanner = clamd:192.0.2.3 1234:local
508
491fab4c
PP
509 ClamAV's ExtendedDetectionInfo response format is now handled.
510
8544e77a
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511 4. There is now a -bmalware option, restricted to admin users. This option
512 takes one parameter, a filename, and scans that file with Exim's
513 malware-scanning framework. This is intended purely as a debugging aid
514 to ensure that Exim's scanning is working, not to replace other tools.
a9622bc6
PP
515 Note that the ACL framework is not invoked, so if av_scanner references
516 ACL variables without a fallback then this will fail.
8544e77a 517
83e029d5
PP
518 5. There is a new expansion operator, "reverse_ip", which will reverse IP
519 addresses; IPv4 into dotted quad, IPv6 into dotted nibble. Examples:
520
521 ${reverse_ip:192.0.2.4}
522 -> 4.2.0.192
523 ${reverse_ip:2001:0db8:c42:9:1:abcd:192.0.2.3}
524 -> 3.0.2.0.0.0.0.c.d.c.b.a.1.0.0.0.9.0.0.0.2.4.c.0.8.b.d.0.1.0.0.2
525
ed7f7860
PP
526 6. There is a new ACL control called "debug", to enable debug logging.
527 This allows selective logging of certain incoming transactions within
528 production environments, with some care. It takes two options, "tag"
529 and "opts"; "tag" is included in the filename of the log and "opts"
530 is used as per the -d<options> command-line option. Examples, which
531 don't all make sense in all contexts:
532
533 control = debug
534 control = debug/tag=.$sender_host_address
535 control = debug/opts=+expand+acl
536 control = debug/tag=.$message_exim_id/opts=+expand
537
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PP
538 7. It has always been implicit in the design and the documentation that
539 "the Exim user" is not root. src/EDITME said that using root was
540 "very strongly discouraged". This is not enough to keep people from
541 shooting themselves in the foot in days when many don't configure Exim
542 themselves but via package build managers. The security consequences of
543 running various bits of network code are severe if there should be bugs in
544 them. As such, the Exim user may no longer be root. If configured
545 statically, Exim will refuse to build. If configured as ref:user then Exim
546 will exit shortly after start-up. If you must shoot yourself in the foot,
547 then henceforth you will have to maintain your own local patches to strip
548 the safeties off.
549
06a6f4ed 550 8. There is a new expansion condition, bool_lax{}. Where bool{} uses the ACL
6a8de854
PP
551 condition logic to determine truth/failure and will fail to expand many
552 strings, bool_lax{} uses the router condition logic, where most strings
553 do evaluate true.
554 Note: bool{00} is false, bool_lax{00} is true.
555
06a6f4ed 556 9. Routers now support multiple "condition" tests.
532be449 557
5dc43717
JJ
55810. There is now a runtime configuration option "tcp_wrappers_daemon_name".
559 Setting this allows an admin to define which entry in the tcpwrappers
560 config file will be used to control access to the daemon. This option
561 is only available when Exim is built with USE_TCP_WRAPPERS. The
562 default value is set at build time using the TCP_WRAPPERS_DAEMON_NAME
563 build option.
564
79d4bc3d
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56511. [POSSIBLE CONFIG BREAKAGE] The default value for system_filter_user is now
566 the Exim run-time user, instead of root.
567
2cfd3221
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56812. [POSSIBLE CONFIG BREAKAGE] ALT_CONFIG_ROOT_ONLY is no longer optional and
569 is forced on. This is mitigated by the new build option
90b6341f 570 TRUSTED_CONFIG_LIST which defines a list of configuration files which
7f7f0545
DW
571 are trusted; one per line. If a config file is owned by root and matches
572 a pathname in the list, then it may be invoked by the Exim build-time
573 user without Exim relinquishing root privileges.
2cfd3221
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574
57513. [POSSIBLE CONFIG BREAKAGE] The Exim user is no longer automatically
576 trusted to supply -D<Macro[=Value]> overrides on the command-line. Going
90b6341f
DW
577 forward, we recommend using TRUSTED_CONFIG_LIST with shim configs that
578 include the main config. As a transition mechanism, we are temporarily
579 providing a work-around: the new build option WHITELIST_D_MACROS provides
43236f35 580 a colon-separated list of macro names which may be overridden by the Exim
90b6341f
DW
581 run-time user. The values of these macros are constrained to the regex
582 ^[A-Za-z0-9_/.-]*$ (which explicitly does allow for empty values).
2cfd3221 583
77bb000f 584
3fc596e4
NM
585Version 4.72
586------------
587
b26eacf1
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588 1. TWO SECURITY FIXES: one relating to mail-spools which are globally
589 writable, the other to locking of MBX folders (not mbox).
590
591 2. MySQL stored procedures are now supported.
592
593 3. The dkim_domain transport option is now a list, not a single string, and
594 messages will be signed for each element in the list (discarding
595 duplicates).
596
597 4. The 4.70 release unexpectedly changed the behaviour of dnsdb TXT lookups
598 in the presence of multiple character strings within the RR. Prior to 4.70,
599 only the first string would be returned. The dnsdb lookup now, by default,
600 preserves the pre-4.70 semantics, but also now takes an extended output
8f425947
PP
601 separator specification. The separator can be followed by a semicolon, to
602 concatenate the individual text strings together with no join character,
603 or by a comma and a second separator character, in which case the text
604 strings within a TXT record are joined on that second character.
605 Administrators are reminded that DNS provides no ordering guarantees
606 between multiple records in an RRset. For example:
b26eacf1
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607
608 foo.example. IN TXT "a" "b" "c"
609 foo.example. IN TXT "d" "e" "f"
610
611 ${lookup dnsdb{>/ txt=foo.example}} -> "a/d"
612 ${lookup dnsdb{>/; txt=foo.example}} -> "def/abc"
8f425947 613 ${lookup dnsdb{>/,+ txt=foo.example}} -> "a+b+c/d+e+f"
b26eacf1 614
3fc596e4 615
f33253cc
NM
616Version 4.70 / 4.71
617-------------------
65a7d8c3 618
7c6d71af 619 1. Native DKIM support without an external library.
a8c8d6b5
JJ
620 (Note that if no action to prevent it is taken, a straight upgrade will
621 result in DKIM verification of all signed incoming emails. See spec
622 for details on conditionally disabling)
7c6d71af
NM
623
624 2. Experimental DCC support via dccifd (contributed by Wolfgang Breyha).
65a7d8c3 625
f33253cc 626 3. There is now a bool{} expansion condition which maps certain strings to
7d9f747b 627 true/false condition values (most likely of use in conjunction with the
f33253cc
NM
628 and{} expansion operator).
629
630 4. The $spam_score, $spam_bar and $spam_report variables are now available
631 at delivery time.
632
633 5. exim -bP now supports "macros", "macro_list" or "macro MACRO_NAME" as
634 options, provided that Exim is invoked by an admin_user.
635
636 6. There is a new option gnutls_compat_mode, when linked against GnuTLS,
637 which increases compatibility with older clients at the cost of decreased
638 security. Don't set this unless you need to support such clients.
639
640 7. There is a new expansion operator, ${randint:...} which will produce a
641 "random" number less than the supplied integer. This randomness is
642 not guaranteed to be cryptographically strong, but depending upon how
643 Exim was built may be better than the most naive schemes.
644
645 8. Exim now explicitly ensures that SHA256 is available when linked against
646 OpenSSL.
647
648 9. The transport_filter_timeout option now applies to SMTP transports too.
649
65a7d8c3 650
7d9f747b
PP
651Version 4.69
652------------
653
654 1. Preliminary DKIM support in Experimental.
655
656
2b85bce7
PH
657Version 4.68
658------------
659
660 1. The body_linecount and body_zerocount C variables are now exported in the
661 local_scan API.
662
93655c46
PH
663 2. When a dnslists lookup succeeds, the key that was looked up is now placed
664 in $dnslist_matched. When the key is an IP address, it is not reversed in
665 this variable (though it is, of course, in the actual lookup). In simple
666 cases, for example:
667
668 deny dnslists = spamhaus.example
669
670 the key is also available in another variable (in this case,
671 $sender_host_address). In more complicated cases, however, this is not
672 true. For example, using a data lookup might generate a dnslists lookup
673 like this:
674
675 deny dnslists = spamhaus.example/<|192.168.1.2|192.168.6.7|...
676
677 If this condition succeeds, the value in $dnslist_matched might be
678 192.168.6.7 (for example).
679
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PH
680 3. Authenticators now have a client_condition option. When Exim is running as
681 a client, it skips an authenticator whose client_condition expansion yields
682 "0", "no", or "false". This can be used, for example, to skip plain text
683 authenticators when the connection is not encrypted by a setting such as:
684
685 client_condition = ${if !eq{$tls_cipher}{}}
686
687 Note that the 4.67 documentation states that $tls_cipher contains the
688 cipher used for incoming messages. In fact, during SMTP delivery, it
689 contains the cipher used for the delivery. The same is true for
690 $tls_peerdn.
691
a96603a0
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692 4. There is now a -Mvc <message-id> option, which outputs a copy of the
693 message to the standard output, in RFC 2822 format. The option can be used
694 only by an admin user.
695
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PH
696 5. There is now a /noupdate option for the ratelimit ACL condition. It
697 computes the rate and checks the limit as normal, but it does not update
698 the saved data. This means that, in relevant ACLs, it is possible to lookup
699 the existence of a specified (or auto-generated) ratelimit key without
700 incrementing the ratelimit counter for that key.
701
702 In order for this to be useful, another ACL entry must set the rate
703 for the same key somewhere (otherwise it will always be zero).
704
705 Example:
706
707 acl_check_connect:
708 # Read the rate; if it doesn't exist or is below the maximum
709 # we update it below
710 deny ratelimit = 100 / 5m / strict / noupdate
711 log_message = RATE: $sender_rate / $sender_rate_period \
712 (max $sender_rate_limit)
713
714 [... some other logic and tests...]
715
716 warn ratelimit = 100 / 5m / strict / per_cmd
717 log_message = RATE UPDATE: $sender_rate / $sender_rate_period \
718 (max $sender_rate_limit)
719 condition = ${if le{$sender_rate}{$sender_rate_limit}}
720
721 accept
722
d677b2f2
PH
723 6. The variable $max_received_linelength contains the number of bytes in the
724 longest line that was received as part of the message, not counting the
725 line termination character(s).
726
d52120f2
PH
727 7. Host lists can now include +ignore_defer and +include_defer, analagous to
728 +ignore_unknown and +include_unknown. These options should be used with
729 care, probably only in non-critical host lists such as whitelists.
730
8669f003
PH
731 8. There's a new option called queue_only_load_latch, which defaults true.
732 If set false when queue_only_load is greater than zero, Exim re-evaluates
733 the load for each incoming message in an SMTP session. Otherwise, once one
734 message is queued, the remainder are also.
735
4f054c63 736 9. There is a new ACL, specified by acl_smtp_notquit, which is run in most
8f128379
PH
737 cases when an SMTP session ends without sending QUIT. However, when Exim
738 itself is is bad trouble, such as being unable to write to its log files,
739 this ACL is not run, because it might try to do things (such as write to
740 log files) that make the situation even worse.
741
742 Like the QUIT ACL, this new ACL is provided to make it possible to gather
743 statistics. Whatever it returns (accept or deny) is immaterial. The "delay"
744 modifier is forbidden in this ACL.
745
746 When the NOTQUIT ACL is running, the variable $smtp_notquit_reason is set
747 to a string that indicates the reason for the termination of the SMTP
748 connection. The possible values are:
749
750 acl-drop Another ACL issued a "drop" command
751 bad-commands Too many unknown or non-mail commands
752 command-timeout Timeout while reading SMTP commands
753 connection-lost The SMTP connection has been lost
754 data-timeout Timeout while reading message data
755 local-scan-error The local_scan() function crashed
756 local-scan-timeout The local_scan() function timed out
757 signal-exit SIGTERM or SIGINT
758 synchronization-error SMTP synchronization error
759 tls-failed TLS failed to start
760
761 In most cases when an SMTP connection is closed without having received
762 QUIT, Exim sends an SMTP response message before actually closing the
763 connection. With the exception of acl-drop, the default message can be
764 overridden by the "message" modifier in the NOTQUIT ACL. In the case of a
765 "drop" verb in another ACL, it is the message from the other ACL that is
766 used.
767
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PH
76810. For MySQL and PostgreSQL lookups, it is now possible to specify a list of
769 servers with individual queries. This is done by starting the query with
770 "servers=x:y:z;", where each item in the list may take one of two forms:
771
772 (1) If it is just a host name, the appropriate global option (mysql_servers
773 or pgsql_servers) is searched for a host of the same name, and the
774 remaining parameters (database, user, password) are taken from there.
775
776 (2) If it contains any slashes, it is taken as a complete parameter set.
777
778 The list of servers is used in exactly the same was as the global list.
779 Once a connection to a server has happened and a query has been
780 successfully executed, processing of the lookup ceases.
781
782 This feature is intended for use in master/slave situations where updates
783 are occurring, and one wants to update a master rather than a slave. If the
784 masters are in the list for reading, you might have:
785
786 mysql_servers = slave1/db/name/pw:slave2/db/name/pw:master/db/name/pw
787
788 In an updating lookup, you could then write
789
790 ${lookup mysql{servers=master; UPDATE ...}
791
792 If, on the other hand, the master is not to be used for reading lookups:
793
794 pgsql_servers = slave1/db/name/pw:slave2/db/name/pw
795
796 you can still update the master by
797
798 ${lookup pgsql{servers=master/db/name/pw; UPDATE ...}
799
ddea74fa
PH
80011. The message_body_newlines option (default FALSE, for backwards
801 compatibility) can be used to control whether newlines are present in
802 $message_body and $message_body_end. If it is FALSE, they are replaced by
803 spaces.
804
2b85bce7 805
b4ed4da0
PH
806Version 4.67
807------------
808
809 1. There is a new log selector called smtp_no_mail, which is not included in
810 the default setting. When it is set, a line is written to the main log
811 whenever an accepted SMTP connection terminates without having issued a
4aa45c31 812 MAIL command.
b4ed4da0 813
431b7361 814 2. When an item in a dnslists list is followed by = and & and a list of IP
4aa45c31
PH
815 addresses, the behaviour was not clear when the lookup returned more than
816 one IP address. This has been solved by the addition of == and =& for "all"
93655c46 817 rather than the default "any" matching.
431b7361 818
4aa45c31
PH
819 3. Up till now, the only control over which cipher suites GnuTLS uses has been
820 for the cipher algorithms. New options have been added to allow some of the
821 other parameters to be varied.
431b7361 822
4aa45c31
PH
823 4. There is a new compile-time option called ENABLE_DISABLE_FSYNC. When it is
824 set, Exim compiles a runtime option called disable_fsync.
431b7361 825
4aa45c31 826 5. There is a new variable called $smtp_count_at_connection_start.
431b7361 827
4aa45c31 828 6. There's a new control called no_pipelining.
cf8b11a5 829
41c7c167 830 7. There are two new variables called $sending_ip_address and $sending_port.
4aa45c31 831 These are set whenever an SMTP connection to another host has been set up.
41c7c167
PH
832
833 8. The expansion of the helo_data option in the smtp transport now happens
4aa45c31 834 after the connection to the server has been made.
41c7c167 835
9c57cbc0 836 9. There is a new expansion operator ${rfc2047d: that decodes strings that
4aa45c31 837 are encoded as per RFC 2047.
9c57cbc0 838
f3f065bb
PH
83910. There is a new log selector called "pid", which causes the current process
840 id to be added to every log line, in square brackets, immediately after the
841 time and date.
842
047bdd8c 84311. Exim has been modified so that it flushes SMTP output before implementing
4c590bd1
PH
844 a delay in an ACL. It also flushes the output before performing a callout,
845 as this can take a substantial time. These behaviours can be disabled by
846 obeying control = no_delay_flush or control = no_callout_flush,
4aa45c31 847 respectively, at some earlier stage of the connection.
047bdd8c 848
0ce9abe6 84912. There are two new expansion conditions that iterate over a list. They are
4aa45c31 850 called forany and forall.
0ce9abe6 851
0e22dfd1
PH
85213. There's a new global option called dsn_from that can be used to vary the
853 contents of From: lines in bounces and other automatically generated
854 messages ("delivery status notifications" - hence the name of the option).
0e22dfd1 855
4aa45c31 85614. The smtp transport has a new option called hosts_avoid_pipelining.
c51b8e75 857
75b1493f 85815. By default, exigrep does case-insensitive matches. There is now a -I option
4aa45c31 859 that makes it case-sensitive.
29f89cad 860
4aa45c31
PH
86116. A number of new features ("addresses", "map", "filter", and "reduce") have
862 been added to string expansions to make it easier to process lists of
863 items, typically addresses.
29f89cad 864
c3611384
PH
86517. There's a new ACL modifier called "continue". It does nothing of itself,
866 and processing of the ACL always continues with the next condition or
867 modifier. It is provided so that the side effects of expanding its argument
4aa45c31 868 can be used.
c3611384 869
ec95d1a6 87018. It is now possible to use newline and other control characters (those with
4aa45c31 871 values less than 32, plus DEL) as separators in lists.
ec95d1a6 872
b2d5182b
PH
87319. The exigrep utility now has a -v option, which inverts the matching
874 condition.
875
c456d9bb 87620. The host_find_failed option in the manualroute router can now be set to
4aa45c31 877 "ignore".
c456d9bb 878
b4ed4da0
PH
879
880Version 4.66
881------------
882
883No new features were added to 4.66.
884
885
886Version 4.65
887------------
888
889No new features were added to 4.65.
890
38a0a95f
PH
891
892Version 4.64
893------------
894
af561417
PH
895 1. ACL variables can now be given arbitrary names, as long as they start with
896 "acl_c" or "acl_m" (for connection variables and message variables), are at
897 least six characters long, with the sixth character being either a digit or
883335dc 898 an underscore.
af561417
PH
899
900 2. There is a new ACL modifier called log_reject_target. It makes it possible
883335dc 901 to specify which logs are used for messages about ACL rejections.
af561417
PH
902
903 3. There is a new authenticator called "dovecot". This is an interface to the
904 authentication facility of the Dovecot POP/IMAP server, which can support a
883335dc 905 number of authentication methods.
af561417
PH
906
907 4. The variable $message_headers_raw provides a concatenation of all the
908 messages's headers without any decoding. This is in contrast to
909 $message_headers, which does RFC2047 decoding on the header contents.
910
883335dc
PH
911 5. In a DNS black list, if two domain names, comma-separated, are given, the
912 second is used first to do an initial check, making use of any IP value
913 restrictions that are set. If there is a match, the first domain is used,
914 without any IP value restrictions, to get the TXT record.
af561417 915
883335dc 916 6. All authenticators now have a server_condition option.
af561417
PH
917
918 7. There is a new command-line option called -Mset. It is useful only in
919 conjunction with -be (that is, when testing string expansions). It must be
920 followed by a message id; Exim loads the given message from its spool
883335dc 921 before doing the expansions.
af561417
PH
922
923 8. Another similar new command-line option is called -bem. It operates like
883335dc
PH
924 -be except that it must be followed by the name of a file that contains a
925 message.
af561417
PH
926
927 9. When an address is delayed because of a 4xx response to a RCPT command, it
928 is now the combination of sender and recipient that is delayed in
883335dc 929 subsequent queue runs until its retry time is reached.
af561417
PH
930
93110. Unary negation and the bitwise logical operators and, or, xor, not, and
883335dc 932 shift, have been added to the eval: and eval10: expansion items.
48c7f9e2 933
194cc0e4
PH
93411. The variables $interface_address and $interface_port have been renamed
935 as $received_ip_address and $received_port, to make it clear that they
936 relate to message reception rather than delivery. (The old names remain
937 available for compatibility.)
938
883335dc
PH
93912. The "message" modifier can now be used on "accept" and "discard" acl verbs
940 to vary the message that is sent when an SMTP command is accepted.
4e88a19f 941
495ae4b0 942
4608d683
PH
943Version 4.63
944------------
945
9461. There is a new Boolean option called filter_prepend_home for the redirect
38a0a95f 947 router.
4608d683 948
45b91596
PH
9492. There is a new acl, set by acl_not_smtp_start, which is run right at the
950 start of receiving a non-SMTP message, before any of the message has been
38a0a95f 951 read.
45b91596 952
a5bd321b
PH
9533. When an SMTP error message is specified in a "message" modifier in an ACL,
954 or in a :fail: or :defer: message in a redirect router, Exim now checks the
38a0a95f 955 start of the message for an SMTP error code.
a5bd321b 956
6ec97b1b 9574. There is a new parameter for LDAP lookups called "referrals", which takes
38a0a95f 958 one of the settings "follow" (the default) or "nofollow".
6ec97b1b 959
e22ca4ac
JJ
9605. Version 20070721.2 of exipick now included, offering these new options:
961 --reverse
962 After all other sorting options have bee processed, reverse order
963 before displaying messages (-R is synonym).
964 --random
965 Randomize order of matching messages before displaying.
966 --size
967 Instead of displaying the matching messages, display the sum
968 of their sizes.
969 --sort <variable>[,<variable>...]
970 Before displaying matching messages, sort the messages according to
971 each messages value for each variable.
972 --not
973 Negate the value for every test (returns inverse output from the
974 same criteria without --not).
975
4608d683 976
1cce3af8
PH
977Version 4.62
978------------
979
9801. The ${readsocket expansion item now supports Internet domain sockets as well
981 as Unix domain sockets. If the first argument begins "inet:", it must be of
982 the form "inet:host:port". The port is mandatory; it may be a number or the
983 name of a TCP port in /etc/services. The host may be a name, or it may be an
984 IP address. An ip address may optionally be enclosed in square brackets.
985 This is best for IPv6 addresses. For example:
986
987 ${readsocket{inet:[::1]:1234}{<request data>}...
988
989 Only a single host name may be given, but if looking it up yield more than
990 one IP address, they are each tried in turn until a connection is made. Once
991 a connection has been made, the behaviour is as for ${readsocket with a Unix
992 domain socket.
993
f7fd3850
PH
9942. If a redirect router sets up file or pipe deliveries for more than one
995 incoming address, and the relevant transport has batch_max set greater than
996 one, a batch delivery now occurs.
997
d6629cdc
PH
9983. The appendfile transport has a new option called maildirfolder_create_regex.
999 Its value is a regular expression. For a maildir delivery, this is matched
1000 against the maildir directory; if it matches, Exim ensures that a
1001 maildirfolder file is created alongside the new, cur, and tmp directories.
1002
1cce3af8 1003
7e66e54d
PH
1004Version 4.61
1005------------
1006
4f578862
PH
1007The documentation is up-to-date for the 4.61 release. Major new features since
1008the 4.60 release are:
1009
1010. An option called disable_ipv6, to disable the use of IPv6 completely.
1011
1012. An increase in the number of ACL variables to 20 of each type.
1013
1014. A change to use $auth1, $auth2, and $auth3 in authenticators instead of $1,
1015 $2, $3, (though those are still set) because the numeric variables get used
1016 for other things in complicated expansions.
1017
843a41e8 1018. The default for rfc1413_query_timeout has been changed from 30s to 5s.
4f578862
PH
1019
1020. It is possible to use setclassresources() on some BSD OS to control the
1021 resources used in pipe deliveries.
1022
1023. A new ACL modifier called add_header, which can be used with any verb.
1024
1025. More errors are detectable in retry rules.
1026
1027There are a number of other additions too.
71fafd95 1028
7e66e54d 1029
425ae40f 1030Version 4.60
b5aea5e1
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1031------------
1032
425ae40f
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1033The documentation is up-to-date for the 4.60 release. Major new features since
1034the 4.50 release are:
1a46a8c5 1035
425ae40f 1036. Support for SQLite.
1a46a8c5 1037
425ae40f 1038. Support for IGNOREQUOTA in LMTP.
1a46a8c5 1039
425ae40f 1040. Extensions to the "submission mode" features.
1a46a8c5 1041
425ae40f 1042. Support for Client SMTP Authorization (CSA).
1a46a8c5 1043
425ae40f 1044. Support for ratelimiting hosts and users.
b5aea5e1 1045
425ae40f 1046. New expansion items to help with the BATV "prvs" scheme.
b5aea5e1 1047
425ae40f 1048. A "match_ip" condition, that matches an IP address against a list.
35edf2ff 1049
425ae40f 1050There are many more minor changes.
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1051
1052****