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0f4f2a88 PH |
1 | This document contains detailed information about incompatibilities that might |
2 | be encountered when upgrading from one release of Exim to another. The | |
3 | information is in reverse order of release numbers. Mostly these are relatively | |
4 | small points, and the configuration file is normally upwards compatible, but | |
5 | there have been two big upheavals... | |
6 | ||
7 | ||
8 | ************************************************************************** | |
9 | * There was a big reworking of the way mail routing works for release * | |
10 | * 4.00. Previously used "directors" were abolished, and all routing is * | |
11 | * now done by routers. Policy controls for incoming mail are now done by * | |
12 | * Access Control Lists instead of separate options. All this means that * | |
13 | * pre-4.00 configuration files have to be massively converted. If you * | |
14 | * are coming from a 3.xx release, please read the document in the file * | |
15 | * doc/Exim4.upgrade, and allow some time to complete the upgrade. * | |
16 | * * | |
17 | * There was a big reworking of the way domain/host/net/address lists are * | |
18 | * handled at release 3.00. If you are coming from a pre-3.00 release, it * | |
19 | * might be easier to start again from a default configuration. Otherwise * | |
20 | * you need to read doc/Exim3.upgrade and do a double conversion of your * | |
21 | * configuration file. * | |
22 | ************************************************************************** | |
23 | ||
24 | ||
25 | The rest of this document contains information about changes in 4.xx releases | |
26 | that might affect a running system. | |
2eda48c6 | 27 | |
e6acf885 | 28 | |
c566dd90 PP |
29 | Exim version 4.77 |
30 | ----------------- | |
31 | ||
32 | * GnuTLS will now attempt to use TLS 1.2 and TLS 1.1 before TLS 1.0 and SSL3, | |
33 | if supported by your GnuTLS library. Use the existing | |
34 | "gnutls_require_protocols" option to downgrade this if that will be a | |
35 | problem. Prior to this release, supported values were "TLS1" and "SSL3", | |
36 | so you should be able to update configuration prior to update. | |
37 | ||
39257585 PP |
38 | * The match_<type>{string1}{string2} expansion conditions no longer subject |
39 | string2 to string expansion, unless Exim was built with the new | |
40 | "EXPAND_LISTMATCH_RHS" option. Too many people have inadvertently created | |
41 | insecure configurations that way. If you need the functionality and turn on | |
42 | that build option, please let the developers know, and know why, so we can | |
43 | try to provide a safer mechanism for you. | |
44 | ||
a7ee5955 PP |
45 | The match{}{} expansion condition (for regular expressions) is NOT affected. |
46 | For match_<type>{s1}{s2}, all list functionality is unchanged. The only | |
47 | change is that a '$' appearing in s2 will not trigger expansion, but instead | |
48 | will be treated as a literal $ sign; the effect is very similar to having | |
49 | wrapped s2 with \N...\N. If s2 contains a named list and the list definition | |
50 | uses $expansions then those _will_ be processed as normal. It is only the | |
51 | point at which s2 is read where expansion is inhibited. | |
52 | ||
53 | If you are trying to test if two email addresses are equal, use eqi{s1}{s2}. | |
54 | If you are testing if the address in s1 occurs in the list of items given | |
55 | in s2, either use the new inlisti{s1}{s2} condition (added in 4.77) or use | |
56 | the pre-existing forany{s2}{eqi{$item}{s1}} condition. | |
57 | ||
c566dd90 | 58 | |
e6acf885 PP |
59 | Exim version 4.74 |
60 | ----------------- | |
61 | ||
4050a044 PP |
62 | * The integrated support for dynamically loadable lookup modules has an ABI |
63 | change from the modules supported by some OS vendors through an unofficial | |
64 | patch. Don't try to mix & match. | |
65 | ||
66 | * Some parts of the build system are now beginning to assume that the host | |
67 | environment is POSIX. If you're building on a system where POSIX tools are | |
68 | not the default, you might have an easier time if you switch to the POSIX | |
69 | tools. Feel free to report non-POSIX issues as a request for a feature | |
70 | enhancement, but if the POSIX variants are available then the fix will | |
71 | probably just involve some coercion. See the README instructions for | |
72 | building on such hosts. | |
e6acf885 PP |
73 | |
74 | ||
75 | Exim version 4.73 | |
76 | ----------------- | |
77 | ||
78 | * The Exim run-time user can no longer be root; this was always | |
79 | strongly discouraged, but is now prohibited both at build and | |
80 | run-time. If you need Exim to run routinely as root, you'll need to | |
81 | patch the source and accept the risk. Here be dragons. | |
82 | ||
83 | * Exim will no longer accept a configuration file owned by the Exim | |
84 | run-time user, unless that account is explicitly the value in | |
85 | CONFIGURE_OWNER, which we discourage. Exim now checks to ensure that | |
a7ee5955 | 86 | files are not writeable by other accounts. |
e6acf885 PP |
87 | |
88 | * The ALT_CONFIG_ROOT_ONLY build option is no longer optional and is forced | |
89 | on; the Exim user can, by default, no longer use -C/-D and retain privilege. | |
90 | Two new build options mitigate this. | |
91 | ||
92 | * TRUSTED_CONFIG_LIST defines a file containing a whitelist of config | |
93 | files that are trusted to be selected by the Exim user; one per line. | |
94 | This is the recommended approach going forward. | |
95 | ||
96 | * WHITELIST_D_MACROS defines a colon-separated list of macro names which | |
97 | the Exim run-time user may safely pass without dropping privileges. | |
98 | Because changes to this involve a recompile, this is not the recommended | |
99 | approach but may ease transition. The values of the macros, when | |
43236f35 | 100 | overridden, are constrained to match this regex: ^[A-Za-z0-9_/.-]*$ |
e6acf885 PP |
101 | |
102 | * The system_filter_user option now defaults to the Exim run-time user, | |
103 | rather than root. You can still set it explicitly to root and this | |
104 | can be done with prior versions too, letting you roll versions | |
105 | without needing to change this configuration option. | |
106 | ||
107 | * ClamAV must be at least version 0.95 unless WITH_OLD_CLAMAV_STREAM is | |
108 | defined at build time. | |
109 | ||
110 | ||
2eda48c6 TK |
111 | Exim version 4.70 |
112 | ----------------- | |
113 | ||
114 | 1. Experimental Yahoo! Domainkeys support has been dropped in this release. | |
115 | It has been superceded by a native implementation of its successor DKIM. | |
116 | ||
117 | 2. Up to version 4.69, Exim came with an embedded version of the PCRE library. | |
118 | As of 4.70, this is no longer the case. To compile Exim, you will need PCRE | |
a7ee5955 | 119 | installed. Most OS distributions have ready-made library and development |
2eda48c6 | 120 | packages. |
0f4f2a88 PH |
121 | |
122 | ||
3c223874 PH |
123 | Exim version 4.68 |
124 | ----------------- | |
125 | ||
126 | 1. The internal implementation of the database keys that are used for ACL | |
127 | ratelimiting has been tidied up. This means that an update to 4.68 might cause | |
128 | Exim to "forget" previous rates that it had calculated, and reset them to zero. | |
129 | ||
130 | ||
26da7e20 PH |
131 | Exim version 4.64 |
132 | ----------------- | |
133 | ||
134 | 1. Callouts were setting the name used for EHLO/HELO from $smtp_active_ | |
135 | hostname. This is wrong, because it relates to the incoming message (and | |
136 | probably the interface on which it is arriving) and not to the outgoing | |
137 | callout (which could be using a different interface). This has been | |
138 | changed to use the value of the helo_data option from the smtp transport | |
139 | instead - this is what is used when a message is actually being sent. If | |
140 | there is no remote transport (possible with a router that sets up host | |
141 | addresses), $smtp_active_hostname is used. This change is mentioned here in | |
142 | case somebody is relying on the use of $smtp_active_hostname. | |
143 | ||
ebc9d865 PH |
144 | 2. A bug has been fixed that might just possibly be something that is relied on |
145 | in some configurations. In expansion items such as ${if >{xxx}{yyy}...} an | |
146 | empty string (that is {}) was being interpreted as if it was {0} and therefore | |
147 | treated as the number zero. From release 4.64, such strings cause an error | |
148 | because a decimal number, possibly followed by K or M, is required (as has | |
149 | always been documented). | |
150 | ||
b6c27e28 PH |
151 | 3. There has been a change to the GnuTLS support (ChangeLog/PH/20) to improve |
152 | Exim's performance. Unfortunately, this has the side effect of being slightly | |
153 | non-upwards compatible for versions 4.50 and earlier. If you are upgrading from | |
154 | one of these earlier versions and you use GnuTLS, you must remove the file | |
155 | called gnutls-params in Exim's spool directory. If you don't do this, you will | |
156 | see this error: | |
157 | ||
158 | TLS error on connection from ... (DH params import): Base64 decoding error. | |
159 | ||
160 | Removing the file causes Exim to recompute the relevant encryption parameters | |
161 | and cache them in the new format that was introduced for release 4.51 (May | |
162 | 2005). If you are upgrading from release 4.51 or later, there should be no | |
163 | problem. | |
164 | ||
26da7e20 | 165 | |
a5bd321b PH |
166 | Exim version 4.63 |
167 | ----------------- | |
168 | ||
169 | When an SMTP error message is specified in a "message" modifier in an ACL, or | |
170 | in a :fail: or :defer: message in a redirect router, Exim now checks the start | |
171 | of the message for an SMTP error code. This consists of three digits followed | |
172 | by a space, optionally followed by an extended code of the form n.n.n, also | |
173 | followed by a space. If this is the case and the very first digit is the same | |
174 | as the default error code, the code from the message is used instead. If the | |
175 | very first digit is incorrect, a panic error is logged, and the default code is | |
176 | used. This is an incompatible change, but it is not expected to affect many (if | |
177 | any) configurations. It is possible to suppress the use of the supplied code in | |
178 | a redirect router by setting the smtp_error_code option false. In this case, | |
179 | any SMTP code is quietly ignored. | |
180 | ||
181 | ||
47ca6d6c PH |
182 | Exim version 4.61 |
183 | ----------------- | |
184 | ||
8def5aaf PH |
185 | 1. The default number of ACL variables of each type has been increased to 20, |
186 | and it's possible to compile Exim with more. You can safely upgrade to this | |
187 | release if you already have messages on the queue with saved ACL variable | |
188 | values. However, if you downgrade from this release with messages on the queue, | |
189 | any saved ACL values they may have will be lost. | |
190 | ||
191 | 2. The default value for rfc1413_query_timeout has been changed from 30s to 5s. | |
47ca6d6c PH |
192 | |
193 | ||
8857ccfd PH |
194 | Exim version 4.54 |
195 | ----------------- | |
196 | ||
197 | There was a problem with 4.52/TF/02 in that a "name=" option on control= | |
198 | submission terminated at the next slash, thereby not allowing for slashes in | |
199 | the name. This has been changed so that "name=" takes the rest of the string as | |
200 | its data. It must therefore be the last option. | |
201 | ||
202 | ||
f3f0a1f0 PH |
203 | Version 4.53 |
204 | ------------ | |
205 | ||
206 | If you are using the experimental Domain Keys support, you must upgrade to | |
207 | at least libdomainkeys 0.67 in order to run this release of Exim. | |
208 | ||
209 | ||
b5aea5e1 PH |
210 | Version 4.51 |
211 | ------------ | |
212 | ||
c688b954 PH |
213 | 1. The format in which GnuTLS parameters are cached (in the file gnutls-params |
214 | in the spool directory) has been changed. The new format can also be generated | |
b5aea5e1 PH |
215 | externally, so it is now possible to update the values from outside Exim. This |
216 | has been implemented in an upwards, BUT NOT downwards, compatible manner. | |
217 | Upgrading should be seamless: when Exim finds that it cannot understand an | |
218 | existing cache file, it generates new parameters and writes them to the cache | |
219 | in the new format. If, however, you downgrade from 4.51 to a previous release, | |
220 | you MUST delete the gnutls-params file in the spool directory, because the | |
221 | older Exim will not recognize the new format. | |
222 | ||
c688b954 PH |
223 | 2. When doing a callout as part of verifying an address, Exim was not paying |
224 | attention to any local part prefix or suffix that was matched by the router | |
225 | that accepted the address. It now behaves in the same way as it does for | |
226 | delivery: the affixes are removed from the local part unless | |
227 | rcpt_include_affixes is set on the transport. If you have a configuration that | |
228 | uses prefixes or suffixes on addresses that could be used for callouts, and you | |
229 | want the affixes to be retained, you must make sure that rcpt_include_affixes | |
230 | is set on the transport. | |
231 | ||
447d236c PH |
232 | 3. Bounce and delay warning messages no longer contain details of delivery |
233 | errors, except for explicit messages (e.g. generated by :fail:) and SMTP | |
234 | responses from remote hosts. | |
235 | ||
b5aea5e1 | 236 | |
8b5af54d PH |
237 | Version 4.50 |
238 | ------------ | |
239 | ||
4964e932 PH |
240 | The exicyclog script has been updated to use three-digit numbers in rotated log |
241 | files if the maximum number to keep is greater than 99. If you are already | |
242 | keeping more than 99, there will be an incompatible change when you upgrade. | |
243 | You will probably want to rename your old log files to the new form before | |
c3af992c | 244 | running the new exicyclog. |
8b5af54d PH |
245 | |
246 | ||
0f4f2a88 PH |
247 | Version 4.42 |
248 | ------------ | |
249 | ||
250 | RFC 3848 specifies standard names for the "with" phrase in Received: header | |
251 | lines when AUTH and/or TLS are in use. This is the "received protocol" | |
252 | field. Exim used to use "asmtp" for authenticated SMTP, without any | |
253 | indication (in the protocol name) for TLS use. Now it follows the RFC and | |
254 | uses "esmtpa" if the connection is authenticated, "esmtps" if it is | |
255 | encrypted, and "esmtpsa" if it is both encrypted and authenticated. These names | |
256 | appear in log lines as well as in Received: header lines. | |
257 | ||
258 | ||
259 | Version 4.34 | |
260 | ------------ | |
261 | ||
262 | Change 4.31/2 gave problems to data ACLs and local_scan() functions that | |
263 | expected to see a Received: header. I have changed to yet another scheme. The | |
264 | Received: header is now generated after the body is received, but before the | |
265 | ACL or local_scan() is called. After they have run, the timestamp in the | |
266 | Received: header is updated. | |
267 | ||
268 | Thus, change (a) of 4.31/2 has been reversed, but change (b) is still true, | |
269 | which is lucky, since I decided it was a bug fix. | |
270 | ||
271 | ||
272 | Version 4.33 | |
273 | ------------ | |
274 | ||
275 | If an expansion in a condition on a "warn" statement fails because a lookup | |
276 | defers, the "warn" statement is abandoned, and the next ACL statement is | |
277 | processed. Previously this caused the whole ACL to be aborted. | |
278 | ||
279 | ||
280 | Version 4.32 | |
281 | ------------ | |
282 | ||
283 | Change 4.31/2 has been reversed, as it proved contentious. Recipient callout | |
284 | verification now uses <> in the MAIL command by default, as it did before. A | |
285 | new callout option, "use_sender", has been added to request the other | |
286 | behaviour. | |
287 | ||
288 | ||
289 | Version 4.31 | |
290 | ------------ | |
291 | ||
292 | 1. If you compile Exim to use GnuTLS, it now requires the use of release 1.0.0 | |
293 | or greater. The interface to the obsolete 0.8.x releases is no longer | |
294 | supported. There is one externally visible change: the format for the | |
295 | display of Distinguished Names now uses commas as a separator rather than a | |
296 | slash. This is to comply with RFC 2253. | |
297 | ||
298 | 2. When a message is received, the Received: header line is now generated when | |
299 | reception is complete, instead of at the start of reception. For messages | |
300 | that take a long time to come in, this changes the meaning of the timestamp. | |
301 | There are several side-effects of this change: | |
302 | ||
303 | (a) If a message is rejected by a DATA or non-SMTP ACL, or by local_scan(), | |
304 | the logged header lines no longer include the local Received: line, | |
305 | because it has not yet been created. If the message is a non-SMTP one, | |
306 | and the error is processed by sending a message to the sender, the copy | |
307 | of the original message that is returned does not have an added | |
308 | Received: line. | |
309 | ||
310 | (b) When a filter file is tested using -bf, no additional Received: header | |
311 | is added to the test message. After some thought, I decided that this | |
312 | is a bug fix. | |
313 | ||
314 | The contents of $received_for are not affected by this change. This | |
315 | variable still contains the single recipient of a message, copied after | |
316 | addresses have been rewritten, but before local_scan() is run. | |
317 | ||
318 | 2. Recipient callout verification, like sender verification, was using <> in | |
319 | the MAIL FROM command. This isn't really the right thing, since the actual | |
320 | sender may affect whether the remote host accepts the recipient or not. I | |
321 | have changed it to use the actual sender in the callout; this means that | |
322 | the cache record is now keyed on a recipient/sender pair, not just the | |
323 | recipient address. There doesn't seem to be a real danger of callout loops, | |
324 | since a callout by the remote host to check the sender would use <>. | |
325 | ||
326 | ||
327 | Version 4.30 | |
328 | ------------ | |
329 | ||
330 | 1. I have abolished timeout_DNS as an error that can be detected in retry | |
331 | rules, because it has never worked. Despite the fact that it has been | |
332 | documented since at least release 1.62, there was no code to support it. | |
333 | If you have used it in your retry rules, you will now get a warning message | |
334 | to the log and panic log. It is now treated as plain "timeout". | |
335 | ||
336 | 2. After discussion on the mailing list, Exim no longer adds From:, Date:, or | |
337 | Message-Id: header lines to messages that do not originate locally, that is, | |
338 | messages that have an associated sending host address. | |
339 | ||
340 | 3. When looking up a host name from an IP address, Exim now tries the DNS | |
341 | first, and only if that fails does it use gethostbyaddr() (or equivalent). | |
342 | This change was made because on some OS, not all the names are given for | |
343 | addresses with multiple PTR records via the gethostbyaddr() interface. The | |
344 | order of lookup can be changed by setting host_lookup_order. | |
345 | ||
346 | ||
347 | Version 4.23 | |
348 | ------------ | |
349 | ||
350 | 1. The new FIXED_NEVER_USERS build-time option creates a list of "never users" | |
351 | that cannot be overridden. The default in the distributed EDITME is "root". | |
352 | If for some reason you were (against advice) running deliveries as root, you | |
353 | will have to ensure that FIXED_NEVER_USERS is not set in your | |
354 | Local/Makefile. | |
355 | ||
356 | 2. The ${quote: operator now quotes an empty string, which it did not before. | |
357 | ||
358 | 3. Version 4.23 saves the contents of the ACL variables with the message, so | |
359 | that they can be used later. If one of these variables contains a newline, | |
360 | there will be a newline character in the spool that will not be interpreted | |
361 | correctely by a previous version of Exim. (Exim ignores keyed spool file | |
362 | items that it doesn't understand - precisely for this kind of problem - but | |
363 | it expects them all to be on one line.) | |
364 | ||
365 | So the bottom line is: if you have newlines in your ACL variables, you | |
366 | cannot retreat from 4.23. | |
367 | ||
368 | ||
369 | Version 4.21 | |
370 | ------------ | |
371 | ||
372 | 1. The idea of the "warn" ACL verb is that it adds a header or writes to the | |
373 | log only when "message" or "log_message" are set. However, if one of the | |
374 | conditions was an address verification, or a call to a nested ACL, the | |
375 | messages generated by the underlying test were being passed through. This | |
376 | no longer happens. The underlying message is available in $acl_verify_ | |
377 | message for both "message" and "log_message" expansions, so it can be | |
378 | passed through if needed. | |
379 | ||
380 | 2. The way that the $h_ (and $header_) expansions work has been changed by the | |
381 | addition of RFC 2047 decoding. See the main documentation (the NewStuff file | |
382 | until release 4.30, then the manual) for full details. Briefly, there are | |
383 | now three forms: | |
384 | ||
385 | $rh_xxx: and $rheader_xxx: give the original content of the header | |
386 | line(s), with no processing at all. | |
387 | ||
388 | $bh_xxx: and $bheader_xxx: remove leading and trailing white space, and | |
389 | then decode base64 or quoted-printable "words" within the header text, | |
390 | but do not do charset translation. | |
391 | ||
392 | $h_xxx: and $header_xxx: attempt to translate the $bh_ string to a | |
393 | standard character set. | |
394 | ||
395 | If you have previously been using $h_ expansions to access the raw | |
396 | characters, you should change to $rh_ instead. | |
397 | ||
398 | 3. When Exim creates an RFC 2047 encoded word in a header line, it labels it | |
399 | with the default character set from the headers_charset option instead of | |
400 | always using iso-8859-1. | |
401 | ||
402 | 4. If TMPDIR is defined in Local/Makefile (default in src/EDITME is | |
403 | TMPDIR="/tmp"), Exim checks for the presence of an environment variable | |
404 | called TMPDIR, and if it finds it is different, it changes its value. | |
405 | ||
406 | 5. Following a discussion on the list, the rules by which Exim recognises line | |
407 | endings on incoming messages have been changed. The -dropcr and drop_cr | |
408 | options are now no-ops, retained only for backwards compatibility. The | |
409 | following line terminators are recognized: LF CRLF CR. However, special | |
410 | processing applies to CR: | |
411 | ||
412 | (i) The sequence CR . CR does *not* terminate an incoming SMTP message, | |
413 | nor a local message in the state where . is a terminator. | |
414 | ||
415 | (ii) If a bare CR is encountered in a header line, an extra space is added | |
416 | after the line terminator so as not to end the header. The reasoning | |
417 | behind this is that bare CRs in header lines are most likely either | |
418 | to be mistakes, or people trying to play silly games. | |
419 | ||
420 | 6. The code for using daemon_smtp_port, local_interfaces, and the -oX options | |
421 | has been reorganized. It is supposed to be backwards compatible, but it is | |
422 | mentioned here just in case I've screwed up. | |
423 | ||
424 | ||
425 | ||
426 | Version 4.20 | |
427 | ------------ | |
428 | ||
429 | 1. I have tidied and re-organized the code that uses alarm() for imposing time | |
430 | limits on various things. It shouldn't affect anything, but if you notice | |
431 | processes getting stuck, it may be that I've broken something. | |
432 | ||
433 | 2. The "arguments" log selector now also logs the current working directory | |
434 | when Exim is called. | |
435 | ||
436 | 3. An incompatible change has been made to the appendfile transport. This | |
437 | affects the case when it is used for file deliveries that are set up by | |
438 | .forward and filter files. Previously, any settings of the "file" or | |
439 | "directory" options were ignored. It is hoped that, like the address_file | |
440 | transport in the default configuration, these options were never in fact set | |
441 | on such transports, because they were of no use. | |
442 | ||
443 | Now, if either of these options is set, it is used. The path that is passed | |
444 | by the router is in $address_file (this is not new), so it can be used as | |
445 | part of a longer path, or modified in any other way that expansion permits. | |
446 | ||
447 | If neither "file" nor "directory" is set, the behaviour is unchanged. | |
448 | ||
449 | 4. Related to the above: in a filter, if a "save" command specifies a non- | |
450 | absolute path, the value of $home/ is pre-pended. This no longer happens if | |
451 | $home is unset or is set to an empty string. | |
452 | ||
453 | 5. Multiple file deliveries from a filter or .forward file can never be | |
454 | batched; the value of batch_max on the transport is ignored for file | |
455 | deliveries. I'm assuming that nobody ever actually set batch_max on the | |
456 | address_file transport - it would have had odd effects previously. | |
457 | ||
458 | 6. DESTDIR is the more common variable that ROOT for use when installing | |
459 | software under a different root filing system. The Exim install script now | |
460 | recognizes DESTDIR first; if it is not set, ROOT is used. | |
461 | ||
462 | 7. If DESTDIR is set when installing Exim, it no longer prepends its value to | |
463 | the path of the system aliases file that appears in the default | |
464 | configuration (when a default configuration is installed). If an aliases | |
465 | file is actually created, its name *does* use the prefix. | |
466 | ||
467 | ||
468 | Version 4.14 | |
469 | ------------ | |
470 | ||
471 | 1. The default for the maximum number of unknown SMTP commands that Exim will | |
472 | accept before dropping a connection has been reduced from 5 to 3. However, you | |
473 | can now change the value by setting smtp_max_unknown_commands. | |
474 | ||
475 | 2. The ${quote: operator has been changed so that it turns newline and carriage | |
476 | return characters into \n and \r, respectively. | |
477 | ||
478 | 3. The file names used for maildir messages now include the microsecond time | |
479 | fraction as well as the time in seconds, to cope with systems where the process | |
480 | id can be re-used within the same second. The format is now | |
481 | ||
482 | <time>.H<microsec>P<pid>.<host> | |
483 | ||
484 | This should be a compatible change, but is noted here just in case. | |
485 | ||
486 | 4. The rules for creating message ids have changed, to cope with systems where | |
487 | the process id can be re-used within the same second. The format, however, is | |
488 | unchanged, so this should not cause any problems, except as noted in the next | |
489 | item. | |
490 | ||
491 | 5. The maximum value for localhost_number has been reduced from 255 to 16, in | |
492 | order to implement the new message id rules. For operating systems that have | |
493 | case-insensitive file systems (Cygwin and Darwin), the limit is 10. | |
494 | ||
495 | 6. verify = header_syntax was allowing unqualified addresses in all cases. Now | |
496 | it allows them only for locally generated messages and from hosts that match | |
497 | sender_unqualified_hosts or recipient_unqualified_hosts, respectively. | |
498 | ||
499 | 7. For reasons lost in the mists of time, when a pipe transport was run, the | |
500 | environment variable MESSAGE_ID was set to the message ID preceded by 'E' (the | |
501 | form used in Message-ID: header lines). The 'E' has been removed. | |
502 | ||
503 | ||
504 | Version 4.11 | |
505 | ------------ | |
506 | ||
507 | 1. The handling of lines in the configuration file has changed. Previously, | |
508 | macro expansion was applied to logical lines, after continuations had been | |
509 | joined on. This meant that it could not be used in .include lines, which are | |
510 | handled as physical rather than logical lines. Macro expansion is now done on | |
511 | physical lines rather than logical lines. This means there are two | |
512 | incompatibilities: | |
513 | ||
514 | (a) A macro that expands to # to turn a line into a comment now applies only | |
515 | to the physical line where it appears. Previously, it would have caused | |
516 | any following continuations also to be ignored. | |
517 | ||
518 | (b) A macro name can no longer be split over the boundary between a line and | |
519 | its continuation. Actually, this is more of a bug fix. :-) | |
520 | ||
521 | 2. The -D command line option must now all be within one command line item. | |
522 | This makes it possible to use -D to set a macro to the empty string by commands | |
523 | such as | |
524 | ||
525 | exim -DABC ... | |
526 | exim -DABC= ... | |
527 | ||
528 | Previously, these items would have moved on to the next item on the command | |
529 | line. To include spaces in a macro definition item, quotes must be used, in | |
530 | which case you can also have spaces after -D and surrounding the equals. For | |
531 | example: | |
532 | ||
533 | exim '-D ABC = something' ... | |
534 | ||
535 | 3. The way that addresses that redirect to themselves are handled has been | |
536 | changed, in order to fix an obscure bug. This should not cause any problems | |
537 | except in the case of wanting to go back from a 4.11 (or later) release to an | |
538 | earlier release. If there are undelivered messages on the spool that contain | |
539 | addresses which redirect to themselves, and the redirected addresses have | |
540 | already been delivered, you might get a duplicate delivery if you revert to an | |
541 | earlier Exim. | |
542 | ||
543 | 4. The default way of looking up IP addresses for hosts in the manualroute and | |
544 | queryprogram routers has been changed. If "byname" or "bydns" is explicitly | |
545 | specified, there is no change, but if no method is specified, Exim now behaves | |
546 | as follows: | |
547 | ||
548 | First, a DNS lookup is done. If this yields anything other than | |
549 | HOST_NOT_FOUND, that result is used. Otherwise, Exim goes on to try a call to | |
550 | getipnodebyname() (or gethostbyname() on older systems) and the result of the | |
551 | lookup is the result of that call. | |
552 | ||
553 | This change has been made because it has been discovered that on some systems, | |
554 | if a DNS lookup called via getipnodebyname() times out, HOST_NOT_FOUND is | |
555 | returned instead of TRY_AGAIN. Thus, it is safest to try a DNS lookup directly | |
556 | first, and only if that gives a definite "no such host" to try the local | |
557 | function. | |
558 | ||
559 | 5. In fixing the minor security problem with pid_file_path, I have removed some | |
560 | backwards-compatible (undocumented) code which was present to ease conversion | |
561 | from Exim 3. In Exim 4, pid_file_path is a literal; in Exim 3 it was allowed to | |
562 | contain "%s", which was replaced by the port number for daemons listening on | |
563 | non-standard ports. In Exim 4, such daemons do not write a pid file. The | |
564 | backwards compatibility feature was to replace "%s" by nothing if it occurred | |
565 | in an Exim 4 setting of pid_file_path. The bug was in this code. I have solved | |
566 | the problem by removing the backwards compatibility feature. Thus, if you still | |
567 | have "%s" somewhere in a setting of pid_file_path, you should remove it. | |
568 | ||
569 | 6. There has been an extension to lsearch files. The keys in these files may | |
570 | now be quoted in order to allow for whitespace and colons in them. This means | |
571 | that if you were previously using keys that began with a doublequote, you will | |
572 | now have to wrap them with extra quotes and escape the internal quotes. The | |
573 | possibility that anybody is actually doing this seems extremely remote, but it | |
574 | is documented just in case. | |
575 | ||
576 | ||
577 | Version 4.10 | |
578 | ------------ | |
579 | ||
580 | The build-time parameter EXIWHAT_KILL_ARG has been renamed EXIWHAT_KILL_SIGNAL | |
581 | to better reflect its function. The OS-specific files have been updated. Only | |
582 | if you have explicitly set this in your Makefile (highly unlikely) do you need | |
583 | to change anything. | |
584 | ||
585 | **** |