doc/doc-txt/NewStuff

   1 $Cambridge: exim/doc/doc-txt/NewStuff,v 1.148 2007/06/14 14:18:19 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 4.68
  12 ------------
  13
  14  1. The body_linecount and body_zerocount C variables are now exported in the
  15     local_scan API.
  16
  17  2. When a dnslists lookup succeeds, the key that was looked up is now placed
  18     in $dnslist_matched. When the key is an IP address, it is not reversed in
  19     this variable (though it is, of course, in the actual lookup). In simple
  20     cases, for example:
  21
  22       deny dnslists = spamhaus.example
  23
  24     the key is also available in another variable (in this case,
  25     $sender_host_address). In more complicated cases, however, this is not
  26     true. For example, using a data lookup might generate a dnslists lookup
  27     like this:
  28
  29       deny dnslists = spamhaus.example/<|192.168.1.2|192.168.6.7|...
  30
  31     If this condition succeeds, the value in $dnslist_matched might be
  32     192.168.6.7 (for example).
  33
  34
  35 Version 4.67
  36 ------------
  37
  38  1. There is a new log selector called smtp_no_mail, which is not included in
  39     the default setting. When it is set, a line is written to the main log
  40     whenever an accepted SMTP connection terminates without having issued a
  41     MAIL command.
  42
  43  2. When an item in a dnslists list is followed by = and & and a list of IP
  44     addresses, the behaviour was not clear when the lookup returned more than
  45     one IP address. This has been solved by the addition of == and =& for "all"
  46     rather than the default "any" matching.
  47
  48  3. Up till now, the only control over which cipher suites GnuTLS uses has been
  49     for the cipher algorithms. New options have been added to allow some of the
  50     other parameters to be varied.
  51
  52  4. There is a new compile-time option called ENABLE_DISABLE_FSYNC. When it is
  53     set, Exim compiles a runtime option called disable_fsync.
  54
  55  5. There is a new variable called $smtp_count_at_connection_start.
  56
  57  6. There's a new control called no_pipelining.
  58
  59  7. There are two new variables called $sending_ip_address and $sending_port.
  60     These are set whenever an SMTP connection to another host has been set up.
  61
  62  8. The expansion of the helo_data option in the smtp transport now happens
  63     after the connection to the server has been made.
  64
  65  9. There is a new expansion operator ${rfc2047d: that decodes strings that
  66     are encoded as per RFC 2047.
  67
  68 10. There is a new log selector called "pid", which causes the current process
  69     id to be added to every log line, in square brackets, immediately after the
  70     time and date.
  71
  72 11. Exim has been modified so that it flushes SMTP output before implementing
  73     a delay in an ACL. It also flushes the output before performing a callout,
  74     as this can take a substantial time. These behaviours can be disabled by
  75     obeying control = no_delay_flush or control = no_callout_flush,
  76     respectively, at some earlier stage of the connection.
  77
  78 12. There are two new expansion conditions that iterate over a list. They are
  79     called forany and forall.
  80
  81 13. There's a new global option called dsn_from that can be used to vary the
  82     contents of From: lines in bounces and other automatically generated
  83     messages ("delivery status notifications" - hence the name of the option).
  84
  85 14. The smtp transport has a new option called hosts_avoid_pipelining.
  86
  87 15. By default, exigrep does case-insensitive matches. There is now a -I option
  88     that makes it case-sensitive.
  89
  90 16. A number of new features ("addresses", "map", "filter", and "reduce") have
  91     been added to string expansions to make it easier to process lists of
  92     items, typically addresses.
  93
  94 17. There's a new ACL modifier called "continue". It does nothing of itself,
  95     and processing of the ACL always continues with the next condition or
  96     modifier. It is provided so that the side effects of expanding its argument
  97     can be used.
  98
  99 18. It is now possible to use newline and other control characters (those with
 100     values less than 32, plus DEL) as separators in lists.
 101
 102 19. The exigrep utility now has a -v option, which inverts the matching
 103     condition.
 104
 105 20. The host_find_failed option in the manualroute router can now be set to
 106     "ignore".
 107
 108
 109 Version 4.66
 110 ------------
 111
 112 No new features were added to 4.66.
 113
 114
 115 Version 4.65
 116 ------------
 117
 118 No new features were added to 4.65.
 119
 120
 121 Version 4.64
 122 ------------
 123
 124  1. ACL variables can now be given arbitrary names, as long as they start with
 125     "acl_c" or "acl_m" (for connection variables and message variables), are at
 126     least six characters long, with the sixth character being either a digit or
 127     an underscore.
 128
 129  2. There is a new ACL modifier called log_reject_target. It makes it possible
 130     to specify which logs are used for messages about ACL rejections.
 131
 132  3. There is a new authenticator called "dovecot". This is an interface to the
 133     authentication facility of the Dovecot POP/IMAP server, which can support a
 134     number of authentication methods.
 135
 136  4. The variable $message_headers_raw provides a concatenation of all the
 137     messages's headers without any decoding. This is in contrast to
 138     $message_headers, which does RFC2047 decoding on the header contents.
 139
 140  5. In a DNS black list, if two domain names, comma-separated, are given, the
 141     second is used first to do an initial check, making use of any IP value
 142     restrictions that are set. If there is a match, the first domain is used,
 143     without any IP value restrictions, to get the TXT record.
 144
 145  6. All authenticators now have a server_condition option.
 146
 147  7. There is a new command-line option called -Mset. It is useful only in
 148     conjunction with -be (that is, when testing string expansions). It must be
 149     followed by a message id; Exim loads the given message from its spool
 150     before doing the expansions.
 151
 152  8. Another similar new command-line option is called -bem. It operates like
 153     -be except that it must be followed by the name of a file that contains a
 154     message.
 155
 156  9. When an address is delayed because of a 4xx response to a RCPT command, it
 157     is now the combination of sender and recipient that is delayed in
 158     subsequent queue runs until its retry time is reached.
 159
 160 10. Unary negation and the bitwise logical operators and, or, xor, not, and
 161     shift, have been added to the eval: and eval10: expansion items.
 162
 163 11. The variables $interface_address and $interface_port have been renamed
 164     as $received_ip_address and $received_port, to make it clear that they
 165     relate to message reception rather than delivery. (The old names remain
 166     available for compatibility.)
 167
 168 12. The "message" modifier can now be used on "accept" and "discard" acl verbs
 169     to vary the message that is sent when an SMTP command is accepted.
 170
 171
 172 Version 4.63
 173 ------------
 174
 175 1. There is a new Boolean option called filter_prepend_home for the redirect
 176    router.
 177
 178 2. There is a new acl, set by acl_not_smtp_start, which is run right at the
 179    start of receiving a non-SMTP message, before any of the message has been
 180    read.
 181
 182 3. When an SMTP error message is specified in a "message" modifier in an ACL,
 183    or in a :fail: or :defer: message in a redirect router, Exim now checks the
 184    start of the message for an SMTP error code.
 185
 186 4. There is a new parameter for LDAP lookups called "referrals", which takes
 187    one of the settings "follow" (the default) or "nofollow".
 188
 189 5. Version 20070721.2 of exipick now included, offering these new options:
 190     --reverse
 191         After all other sorting options have bee processed, reverse order
 192         before displaying messages (-R is synonym).
 193     --random
 194         Randomize order of matching messages before displaying.
 195     --size
 196         Instead of displaying the matching messages, display the sum
 197         of their sizes.
 198     --sort <variable>[,<variable>...]
 199         Before displaying matching messages, sort the messages according to
 200         each messages value for each variable.
 201     --not
 202         Negate the value for every test (returns inverse output from the
 203         same criteria without --not).
 204
 205
 206 Version 4.62
 207 ------------
 208
 209 1. The ${readsocket expansion item now supports Internet domain sockets as well
 210    as Unix domain sockets. If the first argument begins "inet:", it must be of
 211    the form "inet:host:port". The port is mandatory; it may be a number or the
 212    name of a TCP port in /etc/services. The host may be a name, or it may be an
 213    IP address. An ip address may optionally be enclosed in square brackets.
 214    This is best for IPv6 addresses. For example:
 215
 216      ${readsocket{inet:[::1]:1234}{<request data>}...
 217
 218    Only a single host name may be given, but if looking it up yield more than
 219    one IP address, they are each tried in turn until a connection is made. Once
 220    a connection has been made, the behaviour is as for ${readsocket with a Unix
 221    domain socket.
 222
 223 2. If a redirect router sets up file or pipe deliveries for more than one
 224    incoming address, and the relevant transport has batch_max set greater than
 225    one, a batch delivery now occurs.
 226
 227 3. The appendfile transport has a new option called maildirfolder_create_regex.
 228    Its value is a regular expression. For a maildir delivery, this is matched
 229    against the maildir directory; if it matches, Exim ensures that a
 230    maildirfolder file is created alongside the new, cur, and tmp directories.
 231
 232
 233 Version 4.61
 234 ------------
 235
 236 The documentation is up-to-date for the 4.61 release. Major new features since
 237 the 4.60 release are:
 238
 239 . An option called disable_ipv6, to disable the use of IPv6 completely.
 240
 241 . An increase in the number of ACL variables to 20 of each type.
 242
 243 . A change to use $auth1, $auth2, and $auth3 in authenticators instead of $1,
 244   $2, $3, (though those are still set) because the numeric variables get used
 245   for other things in complicated expansions.
 246
 247 . The default for rfc1413_query_timeout has been changed from 30s to 5s.
 248
 249 . It is possible to use setclassresources() on some BSD OS to control the
 250   resources used in pipe deliveries.
 251
 252 . A new ACL modifier called add_header, which can be used with any verb.
 253
 254 . More errors are detectable in retry rules.
 255
 256 There are a number of other additions too.
 257
 258
 259 Version 4.60
 260 ------------
 261
 262 The documentation is up-to-date for the 4.60 release. Major new features since
 263 the 4.50 release are:
 264
 265 . Support for SQLite.
 266
 267 . Support for IGNOREQUOTA in LMTP.
 268
 269 . Extensions to the "submission mode" features.
 270
 271 . Support for Client SMTP Authorization (CSA).
 272
 273 . Support for ratelimiting hosts and users.
 274
 275 . New expansion items to help with the BATV "prvs" scheme.
 276
 277 . A "match_ip" condition, that matches an IP address against a list.
 278
 279 There are many more minor changes.
 280
 281 ****