doc/doc-txt/NewStuff

   1 $Cambridge: exim/doc/doc-txt/NewStuff,v 1.91 2006/02/28 11:25:40 ph10 Exp $
   2
   3 New Features in Exim
   4 --------------------
   5
   6 This file contains descriptions of new features that have been added to Exim,
   7 but have not yet made it into the main manual (which is most conveniently
   8 updated when there is a relatively large batch of changes). The doc/ChangeLog
   9 file contains a listing of all changes, including bug fixes.
  10
  11 Version 4.61
  12 ------------
  13
  14 PH/01 There is a new global option called disable_ipv6, which does exactly what
  15       its name implies. If set true, even if the Exim binary has IPv6 support,
  16       no IPv6 activities take place. AAAA records are never looked up for host
  17       names given in manual routing data or elsewhere. AAAA records that are
  18       received from the DNS as additional data for MX records are ignored. Any
  19       IPv6 addresses that are listed in local_interfaces, manualroute route
  20       data, etc. are also ignored. If IP literals are enabled, the ipliteral
  21       router declines to handle IPv6 literal addresses.
  22
  23 PH/02 There are now 20 of each type of ACL variable by default (instead of 10).
  24       It is also possible to change the numbers by setting ACL_CVARS and/or
  25       ACL_MVARS in Local/Makefile. Backward compatibility is maintained if you
  26       upgrade to this release with existing messages containing ACL variable
  27       settings on the queue. However, going in the other direction
  28       (downgrading) will not be compatible; the values of ACL variables will be
  29       lost.
  30
  31 PH/03 If quota_warn_message contains a From: header, Exim now refrains from
  32       adding the default one. Similarly, if it contains a Reply-To: header, the
  33       errors_reply_to option, if set, is not used.
  34
  35 PH/04 The variables $auth1, $auth2, $auth3 are now available in authenticators,
  36       containing the same values as $1, $2, $3. The new variables are provided
  37       because the numerical variables can be reset during string expansions
  38       (for example, during a "match" operation) and so may lose the
  39       authentication data. The preferred variables are now the new ones, with
  40       the use of the numerical ones being deprecated, though the support will
  41       not be removed, at least, not for a long time.
  42
  43 PH/05 The "control=freeze" ACL modifier can now be followed by /no_tell. If
  44       the global option freeze_tell is set, it is ignored for the current
  45       message (that is, nobody is told about the freezing), provided all the
  46       "control=freeze" modifiers that are obeyed in the current message have
  47       the /no_tell option.
  48
  49 PH/06 In both GnuTLS and OpenSSL, an expansion of tls_privatekey that results
  50       in an empty string is now treated as unset.
  51
  52 PH/07 There is a new log selector called sender_verify_fail, which is set by
  53       default. If it is unset, the separate log line that gives details of a
  54       sender verification failure is not written. Log lines for the rejection
  55       of SMTP commands (e.g. RCPT) contain just "sender verify failed", so some
  56       detail is lost.
  57
  58 PH/08 The default for dns_check_names_pattern now allows slashes within names,
  59       as there are now some PTR records that contain slashes. This check is
  60       only to protect against broken name servers that fall over on strange
  61       characters, so the fact that it applies to all lookups doesn't matter.
  62
  63 PH/09 The default for rfc4131_query_timeout has been changed from 30s to 5s.
  64
  65 PH/10 When compiled on FreeBSD, NetBSD, or BSD/OS, the pipe transport has a new
  66       Boolean option called use_classresources, defaulting false. If it is set
  67       true, the setclassresources() function is used to set resource limits
  68       when a pipe transport is run to perform a delivery. The limits for the
  69       uid under which the pipe is to run are obtained from the login class
  70       database.
  71
  72 PH/11 If retry_interval_max is set greater than 24 hours, it is quietly reset
  73       to 24 hours. This avoids potential overflow problems when processing G
  74       and H retry rules, and it seems reasonable to require a retry at least
  75       once a day.
  76
  77 PH/12 When the plaintext authenticator is running as a client, the server
  78       challenges are now checked to ensure they are valid base64 strings. The
  79       default action on failure is to abort the authentication. However, if
  80       client_ignore_invalid_base64 is set true, invalid responses are ignored.
  81
  82 PH/13 When the plaintext authenticator is running as a client, the challenges
  83       from the server are placed in $auth1, $auth2, etc. as they are received.
  84       Thus, the challege that is received in response to sending the first
  85       string (with the AUTH command) can be used in the expansion of the second
  86       string, and so on. Currently, up to 3 challenge strings are available in
  87       this way. If an invalid base64 string is received when client_ignore_
  88       invalid_base64 is set, an empty string is put in the $auth<n> variable.
  89
  90 PH/14 Messages created by the autoreply transport now contain a References:
  91       header. This is constructed in accordance with rules that are described
  92       in section 3.64 of RFC 2822, which states that replies should contain
  93       such a header line, and section 3.14 of RFC 3834, which states that
  94       automatic responses are not different in this respect. However, because
  95       some mail processing software does not cope well with very long header
  96       lines, no more than 12 message IDs are copied from the References: header
  97       line in the incoming message. If there are more than 12, the first one
  98       and then the final 11 are copied, before adding the message ID of the
  99       incoming message.
 100
 101
 102 Version 4.60
 103 ------------
 104
 105 The documentation is up-to-date for the 4.60 release. Major new features since
 106 the 4.50 release are:
 107
 108 . Support for SQLite.
 109
 110 . Support for IGNOREQUOTA in LMTP.
 111
 112 . Extensions to the "submission mode" features.
 113
 114 . Support for Client SMTP Authorization (CSA).
 115
 116 . Support for ratelimiting hosts and users.
 117
 118 . New expansion items to help with the BATV "prvs" scheme.
 119
 120 . A "match_ip" condition, that matches an IP address against a list.
 121
 122 There are many more minor changes.
 123
 124 ****