X-Git-Url: https://git.exim.org/users/jgh/exim.git/blobdiff_plain/b5aea5e16720f8b17bcbbf54af966ba034432db9..79378e0f6db8bdf7cde0da6bf518aa2e94906307:/doc/doc-txt/NewStuff diff --git a/doc/doc-txt/NewStuff b/doc/doc-txt/NewStuff index 827c5d1dc..8338b2371 100644 --- a/doc/doc-txt/NewStuff +++ b/doc/doc-txt/NewStuff @@ -1,4 +1,4 @@ -$Cambridge: exim/doc/doc-txt/NewStuff,v 1.27 2005/03/08 11:38:21 ph10 Exp $ +$Cambridge: exim/doc/doc-txt/NewStuff,v 1.97 2006/03/16 11:51:09 ph10 Exp $ New Features in Exim -------------------- @@ -8,41 +8,212 @@ but have not yet made it into the main manual (which is most conveniently updated when there is a relatively large batch of changes). The doc/ChangeLog file contains a listing of all changes, including bug fixes. - -Version 4.51 +Version 4.61 ------------ -PH/01. The format in which GnuTLS parameters are written to the gnutls-param - file in the spool directory has been changed. This change has been made - to alleviate problems that some people had with the generation of the - parameters by Exim when /dev/random was exhausted. In this situation, - Exim would hang until /dev/random acquired some more entropy. +PH/01 There is a new global option called disable_ipv6, which does exactly what + its name implies. If set true, even if the Exim binary has IPv6 support, + no IPv6 activities take place. AAAA records are never looked up for host + names given in manual routing data or elsewhere. AAAA records that are + received from the DNS as additional data for MX records are ignored. Any + IPv6 addresses that are listed in local_interfaces, manualroute route + data, etc. are also ignored. If IP literals are enabled, the ipliteral + router declines to handle IPv6 literal addresses. + +PH/02 There are now 20 of each type of ACL variable by default (instead of 10). + It is also possible to change the numbers by setting ACL_CVARS and/or + ACL_MVARS in Local/Makefile. Backward compatibility is maintained if you + upgrade to this release with existing messages containing ACL variable + settings on the queue. However, going in the other direction + (downgrading) will not be compatible; the values of ACL variables will be + lost. + +PH/03 If quota_warn_message contains a From: header, Exim now refrains from + adding the default one. Similarly, if it contains a Reply-To: header, the + errors_reply_to option, if set, is not used. + +PH/04 The variables $auth1, $auth2, $auth3 are now available in authenticators, + containing the same values as $1, $2, $3. The new variables are provided + because the numerical variables can be reset during string expansions + (for example, during a "match" operation) and so may lose the + authentication data. The preferred variables are now the new ones, with + the use of the numerical ones being deprecated, though the support will + not be removed, at least, not for a long time. + +PH/05 The "control=freeze" ACL modifier can now be followed by /no_tell. If + the global option freeze_tell is set, it is ignored for the current + message (that is, nobody is told about the freezing), provided all the + "control=freeze" modifiers that are obeyed in the current message have + the /no_tell option. + +PH/06 In both GnuTLS and OpenSSL, an expansion of tls_privatekey that results + in an empty string is now treated as unset. + +PH/07 There is a new log selector called sender_verify_fail, which is set by + default. If it is unset, the separate log line that gives details of a + sender verification failure is not written. Log lines for the rejection + of SMTP commands (e.g. RCPT) contain just "sender verify failed", so some + detail is lost. + +PH/08 The default for dns_check_names_pattern now allows slashes within names, + as there are now some PTR records that contain slashes. This check is + only to protect against broken name servers that fall over on strange + characters, so the fact that it applies to all lookups doesn't matter. + +PH/09 The default for rfc4131_query_timeout has been changed from 30s to 5s. + +PH/10 When compiled on FreeBSD, NetBSD, or BSD/OS, the pipe transport has a new + Boolean option called use_classresources, defaulting false. If it is set + true, the setclassresources() function is used to set resource limits + when a pipe transport is run to perform a delivery. The limits for the + uid under which the pipe is to run are obtained from the login class + database. + +PH/11 If retry_interval_max is set greater than 24 hours, it is quietly reset + to 24 hours. This avoids potential overflow problems when processing G + and H retry rules, and it seems reasonable to require a retry at least + once a day. + +PH/12 When the plaintext authenticator is running as a client, the server + challenges are now checked to ensure they are valid base64 strings. The + default action on failure is to abort the authentication. However, if + client_ignore_invalid_base64 is set true, invalid responses are ignored. + +PH/13 When the plaintext authenticator is running as a client, the challenges + from the server are placed in $auth1, $auth2, etc. as they are received. + Thus, the challege that is received in response to sending the first + string (with the AUTH command) can be used in the expansion of the second + string, and so on. Currently, up to 3 challenge strings are available in + this way. If an invalid base64 string is received when client_ignore_ + invalid_base64 is set, an empty string is put in the $auth variable. + +PH/14 Messages created by the autoreply transport now contain a References: + header. This is constructed in accordance with rules that are described + in section 3.64 of RFC 2822, which states that replies should contain + such a header line, and section 3.14 of RFC 3834, which states that + automatic responses are not different in this respect. However, because + some mail processing software does not cope well with very long header + lines, no more than 12 message IDs are copied from the References: header + line in the incoming message. If there are more than 12, the first one + and then the final 11 are copied, before adding the message ID of the + incoming message. + +PH/15 The smtp transport has a new option called authenticated_sender_force. + When set true, it allows the authenticated_sender option's value to be + used, even if Exim has not authenticated as a client. + +PH/16 The expansion ${time_eval:} converts an Exim time string such as + 2d4h1m into a number of seconds. + +PH/17 The ACL modifier control=allow_auth_unadvertised can be used to permit a + client host to use the SMTP AUTH command even when it has not been + advertised in response to EHLO. Furthermore, because there are apparently + some really broken clients that do this, Exim will even accept AUTH after + HELO when this control is set. It should only be used if you really need + it, and you should limit its use to those broken hosts that do not work + without it. For example: + + warn hosts = 192.168.34.25 + control = allow_auth_unadvertised + + This control is permitted only in the connection and HELO ACLs. + +PH/18 There is a new ACL modifier called "add_header" which does what its name + implies. It specifies one of more header lines that are to be added to an + incoming message, assuming, of course, that the message is ultimately + accepted. + + This modifier is permitted in the MAIL, RCPT, PREDATA, DATA, MIME, and + non-SMTP ACLs (in other words, those that are concerned with accepting a + message). Added header lines are accumulated during the MAIL, RCPT, and + PREDATA ACLs, with any duplicates being discarded. They are then added to + the message before processing the DATA and MIME ACLs, during which + further added header lines are accumulated, again with duplicates + discarded. Thus, it is possible to add two identical header lines to an + SMTP message, but only if one is added before DATA and one after. - The new code exports and imports the DH and RSA parameters in PEM - format. This means that the parameters can be generated externally using - the certtool command that is part of GnuTLS. + In the case of non-SMTP messages, new headers are accumulated during the + non-SMTP ACL, and added to the message at the end. - To replace the parameters with new ones, instead of deleting the file - and letting Exim re-create it, you can generate new parameters using - certtool and, when this has been done, replace Exim's cache file by - renaming. The relevant commands are something like this: + The add_header modifier is available for use with all ACL verbs. In the + case of the WARN verb, add_header supersedes the use of "message" for + this purpose; for the other verbs, it provides a new facility. If both + add_header and "message" are present on a WARN verb, both are processed + according to their specifications. - # rm -f new.params - # touch new.params - # chown exim:exim new.params - # chmod 0400 new.params - # certtool --generate-privkey --bits 512 >new.params - # echo "" >>new.params - # certtool --generate-dh-params --bits 1024 >> new.params - # mv new.params params + The add_header modifier acts immediately it is encountered during the + processing of an ACL. This is different to the (now-deprecated) use of + "message" on a WARN verb, where the action is taken only if all the + conditions are true. Notice the difference between these two cases on a + RCPT ACL: - If Exim never has to generate the parameters itself, the possibility of - stalling is removed. + deny add_header = ADDED: some text + + deny + add_header = ADDED: some text -Version 4.50 + In the first case, the header is always added, whether or not the current + recipient is rejected. In the second case, the header is added only if + the recipient is rejected. + + If add_header appears more than once on an ACL statement, multiple + headers are added, provided that they have different content. (In the + case of WARN with "message", only the last value of "message" is used.) + + The facility for specifying where the new header is to be inserted, as + described for WARN with "message" in section 39.19 of the 4.60 manual, is + supported. + +PH/19 The following errors can now be detected in retry rules: + + mail_4xx This is like rcpt_4xx, but applies to MAIL commands + + data_4xx This is like rcpt_4xx, but applies to DATA commands and the + response code after the end of the data + + lost_connection This error occurs when the server unexpectedly closes + the SMTP connection. There may, of course, legitmate reasons + for this (host died, network died), but if it repeats a lot + for the same host, it indicates something odd. + + tls_required The server was required to use TLS (hosts_require_tls), + but either did not offer it, or responded with 4xx to + STARTTLS, or there was a problem setting up the TLS connection + + Note that a 5xx response to STARTTLS is a permanent error. + +PH/20 There are now two options for the exicyclog script: + + -k specifies the number of old logs to keep, overriding the + default that is set when Exim is built. + + -l specifies the log file path, in the same format as the + log_file_path option (e.g. /var/log/exim_%slog), again, + overriding the script's default - which is to find the setting + from Exim's configuration. + + +Version 4.60 ------------ -The documentation is up-to-date for the 4.50 release. +The documentation is up-to-date for the 4.60 release. Major new features since +the 4.50 release are: + +. Support for SQLite. + +. Support for IGNOREQUOTA in LMTP. + +. Extensions to the "submission mode" features. + +. Support for Client SMTP Authorization (CSA). + +. Support for ratelimiting hosts and users. + +. New expansion items to help with the BATV "prvs" scheme. + +. A "match_ip" condition, that matches an IP address against a list. + +There are many more minor changes. ****