doc/doc-txt/NewStuff

   1 $Cambridge: exim/doc/doc-txt/NewStuff,v 1.127 2007/01/17 11:17:58 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 Before a formal release, there may be quite a lot of detail so that people can
   8 test from the snapshots or the CVS before the documentation is updated. Once
   9 the documentation is updated, this file is reduced to a short list.
  10
  11 Version 4.67
  12 ------------
  13
  14  1. There is a new log selector called smtp_no_mail, which is not included in
  15     the default setting. When it is set, a line is written to the main log
  16     whenever an accepted SMTP connection terminates without having issued a
  17     MAIL command. This includes both the case when the connection is dropped,
  18     and the case when QUIT is used. Note that it does not include cases where
  19     the connection is rejected right at the start (by an ACL, or because there
  20     are too many connections, or whatever). These cases already have their own
  21     log lines.
  22
  23     The log line that is written contains the identity of the client in the
  24     usual way, followed by D= and a time, which records the duration of the
  25     connection. If the connection was authenticated, this fact is logged
  26     exactly as it is for an incoming message, with an A= item. If the
  27     connection was encrypted, CV=, DN=, and X= items may appear as they do for
  28     an incoming message, controlled by the same logging options.
  29
  30     Finally, if any SMTP commands were issued during the connection, a C= item
  31     is added to the line, listing the commands that were used. For example,
  32
  33       C=EHLO,QUIT
  34
  35     shows that the client issued QUIT straight after EHLO. If there were fewer
  36     than 20 commands, they are all listed. If there were more than 20 commands,
  37     the last 20 are listed, preceded by "...". However, with the default
  38     setting of 10 for smtp_accep_max_nonmail, the connection will in any case
  39     be aborted before 20 non-mail commands are processed.
  40
  41  2. When an item in a dnslists list is followed by = and & and a list of IP
  42     addresses, in order to restrict the match to specific results from the DNS
  43     lookup, the behaviour was not clear when the lookup returned more than one
  44     IP address. For example, consider the condition
  45
  46       dnslists = a.b.c=127.0.0.1
  47
  48     What happens if the DNS lookup for the incoming IP address yields both
  49     127.0.0.1 and 127.0.0.2 by means of two separate DNS records? Is the
  50     condition true because at least one given value was found, or is it false
  51     because at least one of the found values was not listed? And how does this
  52     affect negated conditions?
  53
  54     The behaviour of = and & has not been changed; however, the text below
  55     documents it more clearly. In addition, two new additional conditions (==
  56     and =&) have been added, to permit the "other" behaviour to be configured.
  57
  58     A DNS lookup may yield more than one record. Thus, the result of the lookup
  59     for a dnslists check may yield more than one IP address. The question then
  60     arises as to whether all the looked up addresses must be listed, or whether
  61     just one is good enough. Both possibilities are provided for:
  62
  63     . If = or & is used, the condition is true if any one of the looked up
  64       IP addresses matches one of the listed addresses. Consider:
  65
  66         dnslists = a.b.c=127.0.0.1
  67
  68       If the DNS lookup yields both 127.0.0.1 and 127.0.0.2, the condition is
  69       true because 127.0.0.1 matches.
  70
  71     . If == or =& is used, the condition is true only if every one of the
  72       looked up IP addresses matches one of the listed addresses. Consider:
  73
  74         dnslists = a.b.c==127.0.0.1
  75
  76       If the DNS lookup yields both 127.0.0.1 and 127.0.0.2, the condition is
  77       false because 127.0.0.2 is not listed. You would need to have
  78
  79         dnslists = a.b.c==127.0.0.1,127.0.0.2
  80
  81       for the condition to be true.
  82
  83     When ! is used to negate IP address matching, it inverts the result, giving
  84     the precise opposite of the behaviour above. Thus:
  85
  86     . If != or !& is used, the condition is true if none of the looked up IP
  87       addresses matches one of the listed addresses. Consider:
  88
  89         dnslists = a.b.c!&0.0.0.1
  90
  91       If the DNS lookup yields both 127.0.0.1 and 127.0.0.2, the condition is
  92       false because 127.0.0.1 matches.
  93
  94     . If !== or !=& is used, the condition is true there is at least one looked
  95       up IP address that does not match. Consider:
  96
  97         dnslists = a.b.c!=&0.0.0.1
  98
  99       If the DNS lookup yields both 127.0.0.1 and 127.0.0.2, the condition is
 100       true, because 127.0.0.2 does not match. You would need to have
 101
 102         dnslists = a.b.c!=&0.0.0.1,0.0.0.2
 103
 104       for the condition to be false.
 105
 106     When the DNS lookup yields only a single IP address, there is no difference
 107     between = and == and between & and =&.
 108
 109
 110 Version 4.66
 111 ------------
 112
 113 No new features were added to 4.66.
 114
 115
 116 Version 4.65
 117 ------------
 118
 119 No new features were added to 4.65.
 120
 121
 122 Version 4.64
 123 ------------
 124
 125  1. ACL variables can now be given arbitrary names, as long as they start with
 126     "acl_c" or "acl_m" (for connection variables and message variables), are at
 127     least six characters long, with the sixth character being either a digit or
 128     an underscore.
 129
 130  2. There is a new ACL modifier called log_reject_target. It makes it possible
 131     to specify which logs are used for messages about ACL rejections.
 132
 133  3. There is a new authenticator called "dovecot". This is an interface to the
 134     authentication facility of the Dovecot POP/IMAP server, which can support a
 135     number of authentication methods.
 136
 137  4. The variable $message_headers_raw provides a concatenation of all the
 138     messages's headers without any decoding. This is in contrast to
 139     $message_headers, which does RFC2047 decoding on the header contents.
 140
 141  5. In a DNS black list, if two domain names, comma-separated, are given, the
 142     second is used first to do an initial check, making use of any IP value
 143     restrictions that are set. If there is a match, the first domain is used,
 144     without any IP value restrictions, to get the TXT record.
 145
 146  6. All authenticators now have a server_condition option.
 147
 148  7. There is a new command-line option called -Mset. It is useful only in
 149     conjunction with -be (that is, when testing string expansions). It must be
 150     followed by a message id; Exim loads the given message from its spool
 151     before doing the expansions.
 152
 153  8. Another similar new command-line option is called -bem. It operates like
 154     -be except that it must be followed by the name of a file that contains a
 155     message.
 156
 157  9. When an address is delayed because of a 4xx response to a RCPT command, it
 158     is now the combination of sender and recipient that is delayed in
 159     subsequent queue runs until its retry time is reached.
 160
 161 10. Unary negation and the bitwise logical operators and, or, xor, not, and
 162     shift, have been added to the eval: and eval10: expansion items.
 163
 164 11. The variables $interface_address and $interface_port have been renamed
 165     as $received_ip_address and $received_port, to make it clear that they
 166     relate to message reception rather than delivery. (The old names remain
 167     available for compatibility.)
 168
 169 12. The "message" modifier can now be used on "accept" and "discard" acl verbs
 170     to vary the message that is sent when an SMTP command is accepted.
 171
 172
 173 Version 4.63
 174 ------------
 175
 176 1. There is a new Boolean option called filter_prepend_home for the redirect
 177    router.
 178
 179 2. There is a new acl, set by acl_not_smtp_start, which is run right at the
 180    start of receiving a non-SMTP message, before any of the message has been
 181    read.
 182
 183 3. When an SMTP error message is specified in a "message" modifier in an ACL,
 184    or in a :fail: or :defer: message in a redirect router, Exim now checks the
 185    start of the message for an SMTP error code.
 186
 187 4. There is a new parameter for LDAP lookups called "referrals", which takes
 188    one of the settings "follow" (the default) or "nofollow".
 189
 190 5. Version 20070721.2 of exipick now included, offering these new options:
 191     --reverse
 192         After all other sorting options have bee processed, reverse order
 193         before displaying messages (-R is synonym).
 194     --random
 195         Randomize order of matching messages before displaying.
 196     --size
 197         Instead of displaying the matching messages, display the sum
 198         of their sizes.
 199     --sort <variable>[,<variable>...]
 200         Before displaying matching messages, sort the messages according to
 201         each messages value for each variable.
 202     --not
 203         Negate the value for every test (returns inverse output from the
 204         same criteria without --not).
 205
 206
 207 Version 4.62
 208 ------------
 209
 210 1. The ${readsocket expansion item now supports Internet domain sockets as well
 211    as Unix domain sockets. If the first argument begins "inet:", it must be of
 212    the form "inet:host:port". The port is mandatory; it may be a number or the
 213    name of a TCP port in /etc/services. The host may be a name, or it may be an
 214    IP address. An ip address may optionally be enclosed in square brackets.
 215    This is best for IPv6 addresses. For example:
 216
 217      ${readsocket{inet:[::1]:1234}{<request data>}...
 218
 219    Only a single host name may be given, but if looking it up yield more than
 220    one IP address, they are each tried in turn until a connection is made. Once
 221    a connection has been made, the behaviour is as for ${readsocket with a Unix
 222    domain socket.
 223
 224 2. If a redirect router sets up file or pipe deliveries for more than one
 225    incoming address, and the relevant transport has batch_max set greater than
 226    one, a batch delivery now occurs.
 227
 228 3. The appendfile transport has a new option called maildirfolder_create_regex.
 229    Its value is a regular expression. For a maildir delivery, this is matched
 230    against the maildir directory; if it matches, Exim ensures that a
 231    maildirfolder file is created alongside the new, cur, and tmp directories.
 232
 233
 234 Version 4.61
 235 ------------
 236
 237 The documentation is up-to-date for the 4.61 release. Major new features since
 238 the 4.60 release are:
 239
 240 . An option called disable_ipv6, to disable the use of IPv6 completely.
 241
 242 . An increase in the number of ACL variables to 20 of each type.
 243
 244 . A change to use $auth1, $auth2, and $auth3 in authenticators instead of $1,
 245   $2, $3, (though those are still set) because the numeric variables get used
 246   for other things in complicated expansions.
 247
 248 . The default for rfc1413_query_timeout has been changed from 30s to 5s.
 249
 250 . It is possible to use setclassresources() on some BSD OS to control the
 251   resources used in pipe deliveries.
 252
 253 . A new ACL modifier called add_header, which can be used with any verb.
 254
 255 . More errors are detectable in retry rules.
 256
 257 There are a number of other additions too.
 258
 259
 260 Version 4.60
 261 ------------
 262
 263 The documentation is up-to-date for the 4.60 release. Major new features since
 264 the 4.50 release are:
 265
 266 . Support for SQLite.
 267
 268 . Support for IGNOREQUOTA in LMTP.
 269
 270 . Extensions to the "submission mode" features.
 271
 272 . Support for Client SMTP Authorization (CSA).
 273
 274 . Support for ratelimiting hosts and users.
 275
 276 . New expansion items to help with the BATV "prvs" scheme.
 277
 278 . A "match_ip" condition, that matches an IP address against a list.
 279
 280 There are many more minor changes.
 281
 282 ****