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extsmail.externals.5
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extsmail.externals.5
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.\" Copyright (C)2008 Laurence Tratt http://tratt.net/laurie/
.\"
.\" Permission is hereby granted, free of charge, to any person obtaining a copy
.\" of this software and associated documentation files (the "Software"), to
.\" deal in the Software without restriction, including without limitation the
.\" rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
.\" sell copies of the Software, and to permit persons to whom the Software is
.\" furnished to do so, subject to the following conditions:
.\"
.\" The above copyright notice and this permission notice shall be included in
.\" all copies or substantial portions of the Software.
.\"
.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
.\" IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
.\" FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
.\" AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
.\" LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
.\" FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
.\" IN THE SOFTWARE.
.Dd $Mdocdate: November 2 2008 $
.Dt EXTSMAIL.EXTERNALS 5
.Os
.Sh NAME
.Nm extsmail.externals
.Nd configure which external commands to robustly send e-mail via
.Sh DESCRIPTION
.Nm
is used to configure
.Xr extsmaild 1 .
It consists of one or more
.Em group
declarations. Each group consists of zero or more
.Em match
/
.Em reject
clauses followed by one or more
.Em external
declarations. An external consists of one or more assignments of
.Em key = value
pairs.
.Pp
When sending messages
.Xr extsmaild 1
first searches through the externals file, in order, for a group whose match /
reject clauses match the message in question. If a group does not contain any
such clauses it automatically matches all messages. Match / reject clauses
currently match only against headers, and use standard POSiX extended regular
expressions (see
.Xr re_format 7
for more details).
.Xr extsmaild 1
then tries each external in the group, in order, to send the message
successfully.
.Pp
The grammar for this file is as follows:
.Bd -literal -offset indent
group ::= { matches* external+ }
matches ::= match
| reject
match ::= MATCH HEADER string
reject ::= REJECT HEADER string
external ::= EXTERNAL ID { defn+ }
defn ::= ID = STRING
| ID = TIME
TIME ::= [0-9]+[dhms]
.Ed
.Pp
Valid assignments within an external are:
.Bl -tag -width Ds
.It sendmail
Defines the external shell command used to send e-mail.
.It timeout
If
.Xr extsmaild 1
is executed in daemon mode, this value defines the length of time that
.Xr extsmaild 1
will retry this external before giving up and trying the next external in the
group. Times are specified as a number followed by
.Em d
(days),
.Em h
(hours),
.Em m
(minutes), or
.Em s
(seconds). If
.Xr extsmaild 1
is executed in batch mode, the
.Em timeout
value is ignored.
.El
.Sh FILES
The
.Em extsmail
configuration file is searched for, in order, in the following locations:
.Pp
.Bl -tag -width Ds -compact
.It ~/.extsmail/externals
Per-user configuration.
.Pp
.It /etc/extsmail/externals
System-wide configuration.
.El
.Sh EXAMPLES
The simplest externals file sending e-mail via
.Xr ssh 1
looks as follows:
.Bd -literal -offset indent
group {
external mymachine {
sendmail = "/usr/bin/ssh \-q \-C \-l user mymachine.net /usr/sbin/sendmail -t"
}
}
.Ed
where
.Em mymachine
is a human-friendly name given to an external (it does not effect processing),
and
.Em user
is the username on the remote machine
.Em mymachine.net .
.Pp
A more complex example using multiple groups, message matching, and multiple
external commands looks as follows:
.Bd -literal -offset indent
group {
match header "^To:.*@foo.com"
external foo {
sendmail = "/usr/bin/ssh \-q \-C \-l user shell.foo.com /usr/sbin/sendmail -t"
}
}
group {
external mymachine {
sendmail = "/usr/bin/ssh \-q \-C \-l user mymachine.net /usr/sbin/sendmail -t"
}
external bk {
sendmail = "/usr/bin/ssh \-q \-C \-l user bk.mymachine.net /usr/sbin/sendmail -t"
}
}
.Ed
.Sh SEE ALSO
.Xr extsmail 1 ,
.Xr extsmail.conf 5 ,
.Xr extsmaild 1
.Sh AUTHORS
.An Laurence Tratt Aq http://tratt.net/laurie/