X-Git-Url: https://git.exim.org/exim.git/blobdiff_plain/bd07276cbdbc5b9a140c9f4d38dfbbdff793e47f..8ff2ba119ba654e9238f157f94bf10ed640ed877:/doc/doc-docbook/spec.xfpt diff --git a/doc/doc-docbook/spec.xfpt b/doc/doc-docbook/spec.xfpt index 3829cc682..0ba62ce5e 100644 --- a/doc/doc-docbook/spec.xfpt +++ b/doc/doc-docbook/spec.xfpt @@ -1,3 +1,4 @@ + . ///////////////////////////////////////////////////////////////////////////// . This is the primary source of the Exim Manual. It is an xfpt document that is . converted into DocBook XML for subsequent conversion into printable and online @@ -948,6 +949,7 @@ User filters are run as part of the routing process, described below. .cindex "base36" .cindex "Darwin" .cindex "Cygwin" +.cindex "exim_msgdate" Every message handled by Exim is given a &'message id'& which is sixteen characters long. It is divided into three parts, separated by hyphens, for example &`16VDhn-0001bo-D3`&. Each part is a sequence of letters and digits, @@ -994,6 +996,10 @@ received by the same process, or by another process with the same (re-used) pid, it is guaranteed that the time will be different. In most cases, the clock will already have ticked while the message was being received. +The exim_msgdate utility (see section &<>&) can be +used to display the date, and optionally the process id, of an Exim +Message ID. + .section "Receiving mail" "SECID13" .cindex "receiving mail" @@ -2810,6 +2816,14 @@ of Exim is installed. It is not necessary to do this when other files that are referenced from the configuration (for example, alias files) are changed, because these are reread each time they are used. +.new +Either a SIGTERM or a SIGINT signal should be used to cause the daemon +to cleanly shut down. +Subprocesses handling recceiving or delivering messages, +or for scanning the queue, +will not be affected by the termination of the daemon process. +.wen + .cmdopt -bdf This option has the same effect as &%-bd%& except that it never disconnects from the controlling terminal, even when no debugging is specified. @@ -3258,6 +3272,12 @@ to the standard output. It is restricted to admin users, unless &%queue_list_requires_admin%& is set false. +.cmdopt -bpi +.cindex queue "list of message IDs" +This option operates like &%-bp%&, but only outputs message ids +(one per line). + + .cmdopt -bpr This option operates like &%-bp%&, but the output is not sorted into chronological order of message arrival. This can speed it up when there are @@ -3267,6 +3287,9 @@ going to be post-processed in a way that doesn't need the sorting. .cmdopt -bpra This option is a combination of &%-bpr%& and &%-bpa%&. +.cmdopt -bpri +This option is a combination of &%-bpr%& and &%-bpi%&. + .cmdopt -bpru This option is a combination of &%-bpr%& and &%-bpu%&. @@ -4397,15 +4420,21 @@ It is only relevant when the &%-bd%& (start listening daemon) option is also given. Normally the daemon creates this socket, unless a &%-oX%& and &*no*& &%-oP%& option is also present. -If this option is given then the socket will not be created. This could be -required if the system is running multiple daemons. +.new +If this option is given then the socket will not be created. This is required +if the system is running multiple daemons, in which case it should +be used on all. +The features supported by the socket will not be available in such cases. The socket is currently used for .ilist fast ramp-up of queue runner processes .next +caching compiled regexes +.next obtaining a current queue size .endlist +.wen .cmdopt -pd .cindex "Perl" "starting the interpreter" @@ -4489,23 +4518,33 @@ every domain. Addresses are routed, local deliveries happen, but no remote transports are run. Performance will be best if the &%queue_run_in_order%& option is false. -If that is so and the &%queue_fast_ramp%& option is true then -in the first phase of the run, +If that is so and +the &%queue_fast_ramp%& option is true +and a daemon-notifier socket is available +then in the first phase of the run, once a threshold number of messages are routed for a given host, a delivery process is forked in parallel with the rest of the scan. .cindex "hints database" "remembering routing" The hints database that remembers which messages are waiting for specific hosts -is updated, as if delivery to those hosts had been deferred. After this is -complete, a second, normal queue scan happens, with routing and delivery taking -place as normal. Messages that are routed to the same host should mostly be +is updated, as if delivery to those hosts had been deferred. + +After the first queue scan complete, +a second, normal queue scan is done, with routing and delivery taking +place as normal. +Messages that are routed to the same host should mostly be delivered down a single SMTP .cindex "SMTP" "passed connection" .cindex "SMTP" "multiple deliveries" .cindex "multiple SMTP deliveries" connection because of the hints that were set up during the first queue scan. -This option may be useful for hosts that are connected to the Internet + +.new +Two-phase queue runs should be used on systems which, even intermittently, +have a large queue (such as mailing-list operators). +They may also be useful for hosts that are connected to the Internet intermittently. +.wen .vitem &%-q[q]i...%& .oindex "&%-qi%&" @@ -4591,6 +4630,15 @@ combined daemon at system boot time is to use a command such as Such a daemon listens for incoming SMTP calls, and also starts a queue runner process every 30 minutes. +.new +.cindex "named queues" "queue runners" +It is possible to set up runners for multiple named queues within one daemon, +For example: +.code +exim -qGhipri/2m -q10m -qqGmailinglist/1h +.endd +.wen + When a daemon is started by &%-q%& with a time value, but without &%-bd%&, no pid file is written unless one is explicitly requested by the &%-oP%& option. @@ -11021,6 +11069,24 @@ abbreviation &%h%& can be used when &%hash%& is used as an operator. +.new +.vitem &*${headerwrap_*&<&'cols'&>&*_*&<&'limit'&>&*:*&<&'string'&>&*}*& +.cindex header "wrapping operator" +.cindex expansion "header wrapping" +This operator line-wraps its argument in a way useful for headers. +The &'cols'& value gives the column number to wrap after, +the &'limit'& gives a limit number of result characters to truncate at. +Either just the &'limit'& and the preceding underbar, or both, can be omitted; +the defaults are 80 and 998. +Wrapping will be inserted at a space if possible before the +column number is reached. +Whitespace at a chosen wrap point is removed. +A line-wrap consists of a newline followed by a tab, +and the tab is counted as 8 columns. +.wen + + + .vitem &*${hex2b64:*&<&'hexstring'&>&*}*& .cindex "base64 encoding" "conversion from hex" .cindex "expansion" "hex to base64" @@ -28269,7 +28335,7 @@ Dovecot 2 POP/IMAP server, which can support a number of authentication methods. Note that Dovecot must be configured to use auth-client not auth-userdb. If you are using Dovecot to authenticate POP/IMAP clients, it might be helpful to use the same mechanisms for SMTP authentication. This is a server -authenticator only. There is only one option: +authenticator only. There is only one non-generic option: .option server_socket dovecot string unset @@ -28281,6 +28347,7 @@ authenticators for different mechanisms. For example: dovecot_plain: driver = dovecot public_name = PLAIN + server_advertise_condition = ${if def:tls_in_cipher} server_socket = /var/run/dovecot/auth-client server_set_id = $auth1 @@ -28290,6 +28357,13 @@ dovecot_ntlm: server_socket = /var/run/dovecot/auth-client server_set_id = $auth1 .endd + +.new +&*Note*&: plaintext authentication methods such as PLAIN and LOGIN +should not be advertised on cleartext SMTP connections. +See the discussion in section &<>&. +.wen + If the SMTP connection is encrypted, or if &$sender_host_address$& is equal to &$received_ip_address$& (that is, the connection is local), the &"secured"& option is passed in the Dovecot authentication command. If, for a TLS @@ -39434,6 +39508,7 @@ the next chapter. The utilities described here are: .irow &<>& &'exim_tidydb'& "clean up a hints database" .irow &<>& &'exim_fixdb'& "patch a hints database" .irow &<>& &'exim_lock'& "lock a mailbox file" +.irow &<>& &'exim_msgdate'& "Message Ids for humans (exim_msgdate)" .endtable Another utility that might be of use to sites with many MTAs is Tom Kistner's @@ -40157,9 +40232,16 @@ exim_lock -q /var/spool/mail/spqr \ .endd Note that if a command is supplied, it must be entirely contained within the second argument &-- hence the quotes. -.ecindex IIDutils +.section "Message Ids for humans (exim_msgdate)" "SECTexim_msgdate" +.cindex "exim_msgdate" +The &'exim_msgdate'& utility is written by Andrew Aitchison and included in the Exim distribution. +This Perl script converts an Exim Mesage ID back into a human readable form. +For details of &'exim_msgdate'&'s options, run &'exim_msgdate'& with the &%--help%& option. + +Section &<>& (Message identification) describes Exim Mesage IDs. +.ecindex IIDutils . //////////////////////////////////////////////////////////////////////////// . //////////////////////////////////////////////////////////////////////////// @@ -42157,8 +42239,9 @@ Example usage: # one, plus the max_rcpt and return_path options remote_forwarded_smtp: driver = smtp - # modify the envelope from, for mails that we forward + # single-recipient so that $original_domain is valid max_rcpt = 1 + # modify the envelope from, for mails that we forward return_path = ${srs_encode {SRS_SECRET} {$return_path} {$original_domain}} .endd