X-Git-Url: https://git.exim.org/exim.git/blobdiff_plain/b975ba52a239bbf56b61a8af88d480bf07c20d81..7496b4175bb751bd33a1d50b39281b52eab996b6:/doc/doc-txt/NewStuff diff --git a/doc/doc-txt/NewStuff b/doc/doc-txt/NewStuff index 30cb58ab5..583fe92f1 100644 --- a/doc/doc-txt/NewStuff +++ b/doc/doc-txt/NewStuff @@ -1,844 +1,413 @@ -$Cambridge: exim/doc/doc-txt/NewStuff,v 1.24 2004/12/29 10:16:52 ph10 Exp $ +$Cambridge: exim/doc/doc-txt/NewStuff,v 1.159 2008/10/16 07:57:01 nm4 Exp $ New Features in Exim -------------------- -This file contains descriptions of new features that have been added to Exim, -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. +This file contains descriptions of new features that have been added to Exim. +Before a formal release, there may be quite a lot of detail so that people can +test from the snapshots or the CVS before the documentation is updated. Once +the documentation is updated, this file is reduced to a short list. - -Version 4.50 +Version 4.70 ------------ - 1. There is a new build-time option called CONFIGURE_GROUP which works like - CONFIGURE_OWNER. It specifies one additional group that is permitted for - the runtime configuration file when the group write permission is set. + 1. Preliminary SPF Best Guess support. Documentation for this is in + experimental-spec.txt. - 2. The "control=submission" facility has a new option /sender_retain. This - has the effect of setting local_sender_retain true and local_from_check - false for the incoming message in which it is encountered. - 3. $recipients is now available in the predata ACL (oversight). +Version 4.68 +------------ - 4. The value of address_data from a sender verification is now available in - $sender_address_data in subsequent conditions in the ACL statement. Note: - this is just like $address_data. The value does not persist after the end - of the current ACL statement. If you want to preserve it, you can use one - of the ACL variables. + 1. The body_linecount and body_zerocount C variables are now exported in the + local_scan API. + + 2. When a dnslists lookup succeeds, the key that was looked up is now placed + in $dnslist_matched. When the key is an IP address, it is not reversed in + this variable (though it is, of course, in the actual lookup). In simple + cases, for example: + + deny dnslists = spamhaus.example + + the key is also available in another variable (in this case, + $sender_host_address). In more complicated cases, however, this is not + true. For example, using a data lookup might generate a dnslists lookup + like this: + + deny dnslists = spamhaus.example/<|192.168.1.2|192.168.6.7|... + + If this condition succeeds, the value in $dnslist_matched might be + 192.168.6.7 (for example). + + 3. Authenticators now have a client_condition option. When Exim is running as + a client, it skips an authenticator whose client_condition expansion yields + "0", "no", or "false". This can be used, for example, to skip plain text + authenticators when the connection is not encrypted by a setting such as: + + client_condition = ${if !eq{$tls_cipher}{}} + + Note that the 4.67 documentation states that $tls_cipher contains the + cipher used for incoming messages. In fact, during SMTP delivery, it + contains the cipher used for the delivery. The same is true for + $tls_peerdn. - 5. The redirect router has two new options: forbid_sieve_filter and - forbid_exim_filter. When filtering is enabled by allow_filter, these - options control which type(s) of filtering are permitted. By default, both - Exim and Sieve filters are allowed. + 4. There is now a -Mvc option, which outputs a copy of the + message to the standard output, in RFC 2822 format. The option can be used + only by an admin user. - 6. A new option for callouts makes it possible to set a different (usually - smaller) timeout for making the SMTP connection. The keyword is "connect". - For example: + 5. There is now a /noupdate option for the ratelimit ACL condition. It + computes the rate and checks the limit as normal, but it does not update + the saved data. This means that, in relevant ACLs, it is possible to lookup + the existence of a specified (or auto-generated) ratelimit key without + incrementing the ratelimit counter for that key. - verify = sender/callout=5s,connect=1s + In order for this to be useful, another ACL entry must set the rate + for the same key somewhere (otherwise it will always be zero). - If not specified, it defaults to the general timeout value. + Example: - 7. The new variables $sender_verify_failure and $recipient_verify_failure - contain information about exactly what failed. In an ACL, after one of - these failures, the relevant variable contains one of the following words: + acl_check_connect: + # Read the rate; if it doesn't exist or is below the maximum + # we update it below + deny ratelimit = 100 / 5m / strict / noupdate + log_message = RATE: $sender_rate / $sender_rate_period \ + (max $sender_rate_limit) - qualify the address was unqualified (no domain), and the message - was neither local nor came from an exempted host; + [... some other logic and tests...] - route routing failed; + warn ratelimit = 100 / 5m / strict / per_cmd + log_message = RATE UPDATE: $sender_rate / $sender_rate_period \ + (max $sender_rate_limit) + condition = ${if le{$sender_rate}{$sender_rate_limit}} - mail routing succeeded, and a callout was attempted; rejection - occurred at or before the MAIL command (that is, on initial - connection, HELO, or MAIL); + accept - recipient the RCPT command in a callout was rejected; + 6. The variable $max_received_linelength contains the number of bytes in the + longest line that was received as part of the message, not counting the + line termination character(s). - postmaster the postmaster check in a callout was rejected. + 7. Host lists can now include +ignore_defer and +include_defer, analagous to + +ignore_unknown and +include_unknown. These options should be used with + care, probably only in non-critical host lists such as whitelists. - The main use of these variables is expected to be to distinguish between - rejections of MAIL and rejections of RCPT. + 8. There's a new option called queue_only_load_latch, which defaults true. + If set false when queue_only_load is greater than zero, Exim re-evaluates + the load for each incoming message in an SMTP session. Otherwise, once one + message is queued, the remainder are also. - 8. The command line option -dd behaves exactly like -d except when used on a - command that starts a daemon process. In that case, debugging is turned off - for the subprocesses that the daemon creates. Thus, it is useful for - monitoring the behaviour of the daemon without creating as much output as - full debugging. + 9. There is a new ACL, specified by acl_smtp_notquit, which is run in most + cases when an SMTP session ends without sending QUIT. However, when Exim + itself is is bad trouble, such as being unable to write to its log files, + this ACL is not run, because it might try to do things (such as write to + log files) that make the situation even worse. - 9. $host_address is now set to the target address during the checking of - ignore_target_hosts. + Like the QUIT ACL, this new ACL is provided to make it possible to gather + statistics. Whatever it returns (accept or deny) is immaterial. The "delay" + modifier is forbidden in this ACL. -10. There are four new variables called $spool_space, $log_space, - $spool_inodes, and $log_inodes. The first two contain the amount of free - space in the disk partitions where Exim has its spool directory and log - directory, respectively. (When these are in the same partition, the values - will, of course, be the same.) The second two variables contain the numbers - of free inodes in the respective partitions. + When the NOTQUIT ACL is running, the variable $smtp_notquit_reason is set + to a string that indicates the reason for the termination of the SMTP + connection. The possible values are: - NOTE: Because disks can nowadays be very large, the values in the space - variables are in kilobytes rather than in bytes. Thus, for example, to - check in an ACL that there is at least 50M free on the spool, you would - write: + acl-drop Another ACL issued a "drop" command + bad-commands Too many unknown or non-mail commands + command-timeout Timeout while reading SMTP commands + connection-lost The SMTP connection has been lost + data-timeout Timeout while reading message data + local-scan-error The local_scan() function crashed + local-scan-timeout The local_scan() function timed out + signal-exit SIGTERM or SIGINT + synchronization-error SMTP synchronization error + tls-failed TLS failed to start - condition = ${if > {$spool_space}{50000}{yes}{no}} + In most cases when an SMTP connection is closed without having received + QUIT, Exim sends an SMTP response message before actually closing the + connection. With the exception of acl-drop, the default message can be + overridden by the "message" modifier in the NOTQUIT ACL. In the case of a + "drop" verb in another ACL, it is the message from the other ACL that is + used. - The values are recalculated whenever any of these variables is referenced. - If the relevant file system does not have the concept of inodes, the value - of those variables is -1. If the operating system does not have the ability - to find the amount of free space (only true for experimental systems), the - space value is -1. +10. For MySQL and PostgreSQL lookups, it is now possible to specify a list of + servers with individual queries. This is done by starting the query with + "servers=x:y:z;", where each item in the list may take one of two forms: -11. It is now permitted to omit both strings after an "if" condition; if the - condition is true, the result is the string "true". As before, when the - second string is omitted, a false condition yields an empty string. This - makes it less cumbersome to write custom ACL and router conditions. For - example, instead of + (1) If it is just a host name, the appropriate global option (mysql_servers + or pgsql_servers) is searched for a host of the same name, and the + remaining parameters (database, user, password) are taken from there. - condition = ${if eq {$acl_m4}{1}{yes}{no}} + (2) If it contains any slashes, it is taken as a complete parameter set. - or the shorter form + The list of servers is used in exactly the same was as the global list. + Once a connection to a server has happened and a query has been + successfully executed, processing of the lookup ceases. - condition = ${if eq {$acl_m4}{1}{yes}} + This feature is intended for use in master/slave situations where updates + are occurring, and one wants to update a master rather than a slave. If the + masters are in the list for reading, you might have: - (because the second string has always defaulted to ""), you can now write + mysql_servers = slave1/db/name/pw:slave2/db/name/pw:master/db/name/pw - condition = ${if eq {$acl_m4}{1}} + In an updating lookup, you could then write - Previously this was a syntax error. + ${lookup mysql{servers=master; UPDATE ...} -12. There is a new "record type" that can be specified in dnsdb lookups. It - is "zns" (for "zone NS"). It performs a lookup for NS records on the given - domain, but if none are found, it removes the first component of the domain - name, and tries again. This process continues until NS records are found - or there are no more components left (or there's a DNS error). In other - words, it may return the name servers for a top-level domain, but it never - returns the root name servers. If there are no NS records for the top-level - domain, the lookup fails. + If, on the other hand, the master is not to be used for reading lookups: - For example, ${lookup dnsdb{zns=xxx.quercite.com}} returns the name - servers for quercite.com, whereas ${lookup dnsdb{zns=xxx.edu}} returns - the name servers for edu, assuming in each case that there are no NS - records for the full domain name. + pgsql_servers = slave1/db/name/pw:slave2/db/name/pw - You should be careful about how you use this lookup because, unless the - top-level domain does not exist, the lookup will always return some host - names. The sort of use to which this might be put is for seeing if the name - servers for a given domain are on a blacklist. You can probably assume that - the name servers for the high-level domains such as .com or .co.uk are not - going to be on such a list. + you can still update the master by -13. Another new "record type" is "mxh"; this looks up MX records just as "mx" - does, but it returns only the names of the hosts, omitting the priority - values. + ${lookup pgsql{servers=master/db/name/pw; UPDATE ...} -14. It is now possible to specify a list of domains or IP addresses to be - looked up in a dnsdb lookup. The list is specified in the normal Exim way, - with colon as the default separator, but with the ability to change this. - For example: +11. The message_body_newlines option (default FALSE, for backwards + compatibility) can be used to control whether newlines are present in + $message_body and $message_body_end. If it is FALSE, they are replaced by + spaces. - ${lookup dnsdb{one.domain.com:two.domain.com}} - ${lookup dnsdb{a=one.host.com:two.host.com}} - ${lookup dnsdb{ptr = <; 1.2.3.4 ; 4.5.6.8}} - In order to retain backwards compatibility, there is one special case: if - the lookup type is PTR and no change of separator is specified, Exim looks - to see if the rest of the string is precisely one IPv6 address. In this - case, it does not treat it as a list. +Version 4.67 +------------ - The data from each lookup is concatenated, with newline separators (by - default - see 14 below), in the same way that multiple DNS records for a - single item are handled. + 1. There is a new log selector called smtp_no_mail, which is not included in + the default setting. When it is set, a line is written to the main log + whenever an accepted SMTP connection terminates without having issued a + MAIL command. - The dnsdb lookup fails only if all the DNS lookups fail. If there is a - temporary DNS error for any of them, the behaviour is controlled by - an optional keyword followed by a comma that may appear before the record - type. The possible keywords are "defer_strict", "defer_never", and - "defer_lax". With "strict" behaviour, any temporary DNS error causes the - whole lookup to defer. With "never" behaviour, a temporary DNS error is - ignored, and the behaviour is as if the DNS lookup failed to find anything. - With "lax" behaviour, all the queries are attempted, but a temporary DNS - error causes the whole lookup to defer only if none of the other lookups - succeed. The default is "lax", so the following lookups are equivalent: + 2. When an item in a dnslists list is followed by = and & and a list of IP + addresses, the behaviour was not clear when the lookup returned more than + one IP address. This has been solved by the addition of == and =& for "all" + rather than the default "any" matching. - ${lookup dnsdb{defer_lax,a=one.host.com:two.host.com}} - ${lookup dnsdb{a=one.host.com:two.host.com}} + 3. Up till now, the only control over which cipher suites GnuTLS uses has been + for the cipher algorithms. New options have been added to allow some of the + other parameters to be varied. - Thus, in the default case, as long as at least one of the DNS lookups - yields some data, the dnsdb lookup succeeds. + 4. There is a new compile-time option called ENABLE_DISABLE_FSYNC. When it is + set, Exim compiles a runtime option called disable_fsync. -15. It is now possible to specify the character to be used as a separator when - a dnsdb lookup returns data from more than one DNS record. The default is a - newline. To specify a different character, put '>' followed by the new - character at the start of the query. For example: + 5. There is a new variable called $smtp_count_at_connection_start. - ${lookup dnsdb{>: a=h1.test.ex:h2.test.ex}} - ${lookup dnsdb{>| mxh=<;m1.test.ex;m2.test.ex}} + 6. There's a new control called no_pipelining. - It is permitted to specify a space as the separator character. Note that - more than one DNS record can be found for a single lookup item; this - feature is relevant even when you do not specify a list. + 7. There are two new variables called $sending_ip_address and $sending_port. + These are set whenever an SMTP connection to another host has been set up. - The same effect could be achieved by wrapping the lookup in ${tr...}; this - feature is just a syntactic simplification. + 8. The expansion of the helo_data option in the smtp transport now happens + after the connection to the server has been made. -16. It is now possible to supply a list of domains and/or IP addresses to be - lookup up in a DNS blacklist. Previously, only a single domain name could - be given, for example: + 9. There is a new expansion operator ${rfc2047d: that decodes strings that + are encoded as per RFC 2047. - dnslists = black.list.tld/$sender_host_name +10. There is a new log selector called "pid", which causes the current process + id to be added to every log line, in square brackets, immediately after the + time and date. - What follows the slash can now be a list. As with all lists, the default - separator is a colon. However, because this is a sublist within the list of - DNS blacklist domains, it is necessary either to double the separators like - this: +11. Exim has been modified so that it flushes SMTP output before implementing + a delay in an ACL. It also flushes the output before performing a callout, + as this can take a substantial time. These behaviours can be disabled by + obeying control = no_delay_flush or control = no_callout_flush, + respectively, at some earlier stage of the connection. - dnslists = black.list.tld/name.1::name.2 +12. There are two new expansion conditions that iterate over a list. They are + called forany and forall. - or to change the separator character, like this: +13. There's a new global option called dsn_from that can be used to vary the + contents of From: lines in bounces and other automatically generated + messages ("delivery status notifications" - hence the name of the option). - dnslists = black.list.tld/<;name.1;name.2 +14. The smtp transport has a new option called hosts_avoid_pipelining. - If an item in the list is an IP address, it is inverted before the DNS - blacklist domain is appended. If it is not an IP address, no inversion - occurs. Consider this condition: +15. By default, exigrep does case-insensitive matches. There is now a -I option + that makes it case-sensitive. - dnslists = black.list.tls/<;192.168.1.2;a.domain +16. A number of new features ("addresses", "map", "filter", and "reduce") have + been added to string expansions to make it easier to process lists of + items, typically addresses. - The DNS lookups that occur are for +17. There's a new ACL modifier called "continue". It does nothing of itself, + and processing of the ACL always continues with the next condition or + modifier. It is provided so that the side effects of expanding its argument + can be used. - 2.1.168.192.black.list.tld and a.domain.black.list.tld +18. It is now possible to use newline and other control characters (those with + values less than 32, plus DEL) as separators in lists. - Once a DNS record has been found (that matches a specific IP return - address, if specified), no further lookups are done. If there is a - temporary DNS error, the rest of the sublist of domains or IP addresses is - tried. The dnslists item itself defers only if none of the other DNS - lookups in this sublist succeeds. In other words, a successful lookup for - any of the items in the sublist overrides a defer for a previous item. +19. The exigrep utility now has a -v option, which inverts the matching + condition. -17. The log selector queue_time_overall causes Exim to output the time spent on - the queue as an addition to the "Completed" message. Like queue_time (which - puts the queue time on individual delivery lines), the time is tagged with - "QT=", and it is measured from the time that the message starts to be - received, so it includes the reception time. +20. The host_find_failed option in the manualroute router can now be set to + "ignore". -18. It is now possible to use both -bF and -bf on the same command, in order to - test a system filter and a user filter in the same run. For example: - exim -bF /system/filter -bf /user/filter } to the expansion operators. This operator - converts an arbitrary string into one that is base64 encoded. - -10. A new authenticator, called cyrus_sasl, has been added. This requires - the presence of the Cyrus SASL library; it authenticates by calling this - library, which supports a number of authentication mechanisms, including - PLAIN and LOGIN, but also several others that Exim does not support - directly. The code for this authenticator was provided by Matthew - Byng-Maddick of A L Digital Ltd (http://www.aldigital.co.uk). Here follows - draft documentation: - - xx. THE CYRUS_SASL AUTHENTICATOR - - The cyrus_sasl authenticator provides server support for the Cyrus library - Implementation of the RFC 2222 "Simple Authentication and Security Layer". - It provides a gatewaying mechanism directly to the Cyrus interface, so if - your Cyrus library can do, for example, CRAM-MD5, then so can the - cyrus_sasl authenticator. By default it uses the public name of the driver - to determine which mechanism to support. - - Where access to some kind of secret file is required, for example in GSSAPI - or CRAM-MD5, it is worth noting that the authenticator runs as the exim - user, and that the Cyrus SASL library has no way of escalating privileges - by default. You may also find you need to set environment variables, - depending on the driver you are using. - - xx.1 Using cyrus_sasl as a server - - The cyrus_sasl authenticator has four private options. It puts the username - (on a successful authentication) into $1. - - server_hostname Type: string* Default: $primary_hostname - - This option selects the hostname that is used when communicating with - the library. It is up to the underlying SASL plug-in what it does with - this data. - - server_mech Type: string Default: public_name - - This option selects the authentication mechanism this driver should - use. It allows you to use a different underlying mechanism from the - advertised name. For example: - - sasl: - driver = cyrus_sasl - public_name = X-ANYTHING - server_mech = CRAM-MD5 - server_set_id = $1 - - server_realm Type: string Default: unset - - This is the SASL realm that the server is claiming to be in. - - server_service Type: string Default: "smtp" - - This is the SASL service that the server claims to implement. - - For straigthforward cases, you do not need to set any of the - authenticator's private options. All you need to do is to specify an - appropriate mechanism as the public name. Thus, if you have a SASL library - that supports CRAM-MD5 and PLAIN, you might have two authenticators as - follows: - - sasl_cram_md5: - driver = cyrus_sasl - public_name = CRAM-MD5 - server_set_id = $1 - - sasl_plain: - driver = cyrus_sasl - public_name = PLAIN - server_set_id = $1 - -11. There is a new global option called tls_on_connect_ports. Its value must be - a list of port numbers; the most common use is expected to be - - tls_on_connect_ports = 465 - - Setting this option has the same effect as -tls-on-connect on the command - line, but only for the specified ports. It applies to all connections, both - via the daemon and via inetd. You still need to specify all the ports for - the daemon (using daemon_smtp_ports or local_interfaces or the -X command - line option) because this option does not add an extra port -- rather, it - specifies different behaviour on a port that is defined elsewhere. The - -tls-on-connect command line option overrides tls_on_connect_ports, and - forces tls-on-connect for all ports. - -12. There is a new ACL that is run when a DATA command is received, before the - data itself is received. The ACL is defined by acl_smtp_predata. (Compare - acl_smtp_data, which is run after the data has been received.) - This new ACL allows a negative response to be given to the DATA command - itself. Header lines added by MAIL or RCPT ACLs are not visible at this - time, but any that are defined here are visible when the acl_smtp_data ACL - is run. - -13. The "control=submission" ACL modifier has an option "/domain=xxx" which - specifies the domain to be used when creating From: or Sender: lines using - the authenticated id as a local part. If the option is supplied with an - empty domain, that is, just "/domain=", Exim assumes that the authenticated - id is a complete email address, and it uses it as is when creating From: - or Sender: lines. - -14. It is now possible to make retry rules that apply only when the failing - message has a specific sender. In particular, this can be used to define - retry rules that apply only to bounce messages. The syntax is to add a new - third item to a retry rule, of the form "senders=
". The retry - timings themselves then become the fourth item. For example: - - * * senders=: F,1h,30m - - would match all bounce messages. If the address list contains white space, - it must be enclosed in quotes. For example: - - a.domain timeout senders="x@b.dom : y@c.dom" G,8h,10m,1.5 - - When testing retry rules using -brt, you can supply a sender using the -f - command line option, like this: - - exim -f "" -brt user@dom.ain - - If you do not set -f with -brt, a retry rule that contains a senders list - will never be matched. - -15. Two new control modifiers have been added to ACLs: "control = enforce_sync" - and "control = no_enforce_sync". This makes it possible to be selective - about when SMTP synchronization is enforced. The global option - smtp_enforce_sync now specifies the default state of the switch. These - controls can appear in any ACL, but the most obvious place to put them is - in the ACL defined by acl_smtp_connect, which is run at the start of an - incoming SMTP connection, before the first synchronization check. - -16. Another two new control modifiers are "control = caseful_local_part" and - "control = caselower_local_part". These are permitted only in the ACL - specified by acl_smtp_rcpt (i.e. during RCPT processing). By default, the - contents of $local_part are lower cased before ACL processing. - After "control = caseful_local_part", any uppercase letters in the original - local part are restored in $local_part for the rest of the ACL, or until - "control = caselower_local_part" is encountered. However, this applies only - to local part handling that takes place directly in the ACL (for example, - as a key in lookups). If a "verify = recipient" test is obeyed, the - case-related handling of the local part during the verification is - controlled by the router configuration (see the caseful_local_part generic - router option). - - This facility could be used, for example, to add a spam score to local - parts containing upper case letters. For example, using $acl_m4 to - accumulate the spam score: - - warn control = caseful_local_part - set acl_m4 = ${eval:\ - $acl_m4 + \ - ${if match{$local_part}{[A-Z]}{1}{0}}\ - } - control = caselower_local_part - - Notice that we put back the lower cased version afterwards, assuming that - is what is wanted for subsequent tests. - -17. The option hosts_connection_nolog is provided so that certain hosts can be - excepted from logging when the +smtp_connection log selector is set. For - example, you might want not to log SMTP connections from local processes, - or from 127.0.0.1, or from your local LAN. The option is a host list with - an unset default. Because it is consulted in the main loop of the daemon, - you should strive to restrict its value to a short inline list of IP - addresses and networks. To disable logging SMTP connections from local - processes, you must create a host list with an empty item. For example: - - hosts_connection_nolog = : - - If the +smtp_connection log selector is not set, this option has no effect. - -18. There is now an acl called acl_smtp_quit, which is run for the QUIT - command. The outcome of the ACL does not affect the response code to QUIT, - which is always 221. Thus, the ACL does not in fact control any access. - For this reason, the only verbs that are permitted are "accept" and "warn". - - The ACL can be used for tasks such as custom logging at the end of an SMTP - session. For example, you can use ACL variables in other ACLs to count - messages, recipients, etc., and log the totals at QUIT time using one or - more "logwrite" modifiers on a "warn" command. - - You do not need to have a final "accept", but if you do, you can use a - "message" modifier to specify custom text that is sent as part of the 221 - response. - - This ACL is run only for a "normal" QUIT. For certain kinds of disastrous - failure (for example, failure to open a log file, or when Exim is bombing - out because it has detected an unrecoverable error), all SMTP commands - from the client are given temporary error responses until QUIT is received - or the connection is closed. In these special cases, the ACL is not run. - -19. The appendfile transport has two new options, mailbox_size and mailbox_ - filecount. If either these options are set, it is expanded, and the result - is taken as the current size of the mailbox or the number of files in the - mailbox, respectively. This makes it possible to use some external means of - maintaining the data about the size of a mailbox for enforcing quota - limits. The result of expanding these option values must be a decimal - number, optionally followed by "K" or "M". - -20. It seems that there are broken clients in use that cannot handle multiline - SMTP responses. Can't people who implement these braindead programs read? - RFC 821 mentions multiline responses, and it is over 20 years old. They - must handle multiline responses for EHLO, or do they still use HELO? - Anyway, here is YAWFAB (yet another workaround for asinine brokenness). - There's a new ACL switch that can be set by - - control = no_multiline_responses - - If this is set, it suppresses multiline SMTP responses from ACL rejections. - One way of doing this would have been just to put out these responses as - one long line. However, RFC 2821 specifies a maximum of 512 bytes per - response ("use multiline responses for more" it says), and some of the - responses might get close to that. So I have implemented this by doing two - very easy things: - - (1) Extra information that is normally output as part of a rejection - caused by sender verification failure is omitted. Only the final line - (typically "sender verification failed") is now sent. - - (2) If a "message" modifier supplies a multiline response, only the first - line is output. - - The setting of the switch can, of course, be made conditional on the - calling host. - -21. There is now support for the libradius library that comes with FreeBSD. - This is an alternative to the radiusclient library that Exim already - supports. To use the FreeBSD library, you need to set - - RADIUS_LIB_TYPE=RADLIB - - in Local/Makefile, in addition to RADIUS_CONFIGURE_FILE, and you probably - also need -libradius in EXTRALIBS. - - -Version 4.42 ------------- + 3. There is a new authenticator called "dovecot". This is an interface to the + authentication facility of the Dovecot POP/IMAP server, which can support a + number of authentication methods. - 1. The "personal" filter test is brought up-to-date with recommendations from - the Sieve specification: (a) The list of non-personal From: addresses now - includes "listserv", "majordomo", and "*-request"; (b) If the message - contains any header line starting with "List=-" it is treated as - non-personal. + 4. The variable $message_headers_raw provides a concatenation of all the + messages's headers without any decoding. This is in contrast to + $message_headers, which does RFC2047 decoding on the header contents. - 2. The Sieve functionality has been extended to support the "copy" and - "vacation" extensions, and comparison tests. + 5. In a DNS black list, if two domain names, comma-separated, are given, the + second is used first to do an initial check, making use of any IP value + restrictions that are set. If there is a match, the first domain is used, + without any IP value restrictions, to get the TXT record. - 3. There is now an overall timeout for performing a callout verification. It - defaults to 4 times the callout timeout, which applies to individual SMTP - commands during the callout. The overall timeout applies when there is more - than one host that can be tried. The timeout is checked before trying the - next host. This prevents very long delays if there are a large number of - hosts and all are timing out (e.g. when the network connections are timing - out). The value of the overall timeout can be changed by specifying an - additional sub-option for "callout", called "maxwait". For example: + 6. All authenticators now have a server_condition option. - verify = sender/callout=5s,maxwait=20s + 7. There is a new command-line option called -Mset. It is useful only in + conjunction with -be (that is, when testing string expansions). It must be + followed by a message id; Exim loads the given message from its spool + before doing the expansions. - 4. Changes to the "personal" filter test: + 8. Another similar new command-line option is called -bem. It operates like + -be except that it must be followed by the name of a file that contains a + message. - (1) The list of non-personal local parts in From: addresses has been - extended to include "listserv", "majordomo", "*-request", and "owner-*", - taken from the Sieve specification recommendations. + 9. When an address is delayed because of a 4xx response to a RCPT command, it + is now the combination of sender and recipient that is delayed in + subsequent queue runs until its retry time is reached. - (2) If the message contains any header line starting with "List-" it is - treated as non-personal. +10. Unary negation and the bitwise logical operators and, or, xor, not, and + shift, have been added to the eval: and eval10: expansion items. - (3) The test for "circular" in the Subject: header line has been removed - because it now seems ill-conceived. +11. The variables $interface_address and $interface_port have been renamed + as $received_ip_address and $received_port, to make it clear that they + relate to message reception rather than delivery. (The old names remain + available for compatibility.) - 5. The autoreply transport has a new option called never_mail. This is an - address list. If any run of the transport creates a message with a - recipient that matches any item in the list, that recipient is quietly - discarded. If all recipients are discarded, no message is created. +12. The "message" modifier can now be used on "accept" and "discard" acl verbs + to vary the message that is sent when an SMTP command is accepted. -Version 4.40 +Version 4.63 ------------ -The documentation is up-to-date for the 4.40 release. What follows here is a -brief list of the new features that have been added since 4.30. +1. There is a new Boolean option called filter_prepend_home for the redirect + router. + +2. There is a new acl, set by acl_not_smtp_start, which is run right at the + start of receiving a non-SMTP message, before any of the message has been + read. + +3. When an SMTP error message is specified in a "message" modifier in an ACL, + or in a :fail: or :defer: message in a redirect router, Exim now checks the + start of the message for an SMTP error code. + +4. There is a new parameter for LDAP lookups called "referrals", which takes + one of the settings "follow" (the default) or "nofollow". + +5. Version 20070721.2 of exipick now included, offering these new options: + --reverse + After all other sorting options have bee processed, reverse order + before displaying messages (-R is synonym). + --random + Randomize order of matching messages before displaying. + --size + Instead of displaying the matching messages, display the sum + of their sizes. + --sort [,...] + Before displaying matching messages, sort the messages according to + each messages value for each variable. + --not + Negate the value for every test (returns inverse output from the + same criteria without --not). + + +Version 4.62 +------------ - 1. log_incoming_interface affects more log lines. +1. The ${readsocket expansion item now supports Internet domain sockets as well + as Unix domain sockets. If the first argument begins "inet:", it must be of + the form "inet:host:port". The port is mandatory; it may be a number or the + name of a TCP port in /etc/services. The host may be a name, or it may be an + IP address. An ip address may optionally be enclosed in square brackets. + This is best for IPv6 addresses. For example: - 2. New ACL modifier "control = submission". + ${readsocket{inet:[::1]:1234}{}... - 3. CONFIGURE_OWNER can be set at build time to define an alternative owner for - the configuration file, in addition to root and exim. + Only a single host name may be given, but if looking it up yield more than + one IP address, they are each tried in turn until a connection is made. Once + a connection has been made, the behaviour is as for ${readsocket with a Unix + domain socket. - 4. Added expansion variables $body_zerocount, $recipient_data, and - $sender_data. +2. If a redirect router sets up file or pipe deliveries for more than one + incoming address, and the relevant transport has batch_max set greater than + one, a batch delivery now occurs. - 5. The time of last modification of the "new" subdirectory is now used as the - "mailbox time last read" when there is a quota error for a maildir - delivery. +3. The appendfile transport has a new option called maildirfolder_create_regex. + Its value is a regular expression. For a maildir delivery, this is matched + against the maildir directory; if it matches, Exim ensures that a + maildirfolder file is created alongside the new, cur, and tmp directories. - 6. The special item "+ignore_unknown" may now appear in host lists. - 7. The special domain-matching patterns @mx_any, @mx_primary, and - @mx_secondary can now be followed by "/ignore=". +Version 4.61 +------------ + +The documentation is up-to-date for the 4.61 release. Major new features since +the 4.60 release are: + +. An option called disable_ipv6, to disable the use of IPv6 completely. + +. An increase in the number of ACL variables to 20 of each type. - 8. New expansion conditions: match_domain, match_address, match_local_part, - lt, lti, le, lei, gt, gti, ge, and new expansion operators time_interval, - eval10, and base62d. +. A change to use $auth1, $auth2, and $auth3 in authenticators instead of $1, + $2, $3, (though those are still set) because the numeric variables get used + for other things in complicated expansions. - 9. New lookup type called "iplsearch". +. The default for rfc1413_query_timeout has been changed from 30s to 5s. -10. New log selectors ident_timeout, tls_certificate_verified, queue_time, - deliver_time, outgoing_port, return_path_on_delivery. +. It is possible to use setclassresources() on some BSD OS to control the + resources used in pipe deliveries. -11. New global options smtp_active_hostname and tls_require_ciphers. +. A new ACL modifier called add_header, which can be used with any verb. -12. Exinext has -C and -D options. +. More errors are detectable in retry rules. + +There are a number of other additions too. + + +Version 4.60 +------------ -13. "domainlist_cache" forces caching of an apparently variable list. +The documentation is up-to-date for the 4.60 release. Major new features since +the 4.50 release are: -14. For compatibility with Sendmail, the command line option -prval:sval - is equivalent to -oMr rval -oMs sval. +. Support for SQLite. -15. New callout options use_sender and use_postmaster for use when verifying - recipients. +. Support for IGNOREQUOTA in LMTP. -16. John Jetmore's "exipick" utility has been added to the distribution. +. Extensions to the "submission mode" features. -17. The TLS code now supports CRLs. +. Support for Client SMTP Authorization (CSA). -18. The dnslookup router and the dnsdb lookup type now support the use of SRV - records. +. Support for ratelimiting hosts and users. -19. The redirect router has a new option called qualify_domain. +. New expansion items to help with the BATV "prvs" scheme. -20. exigrep's output now also includes lines that are not related to any - particular message, but which do match the pattern. +. A "match_ip" condition, that matches an IP address against a list. -21. New global option write_rejectlog. If it is set false, Exim no longer - writes anything to the reject log. +There are many more minor changes. ****