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= Mail Transports and Invoking Agent Programs =
The essential aspect of mail system configuration involves mail transports and
the integration of agent programs into the mail processing pipeline. A number of
example files are provided here.
Such files need adjusting for the deployment environment so that, for example,
the `example.com` domain would be replaced with a suitable value.
If LMTP is being used, instances of `LMTP_SOCKET` in the example configuration
files will need to be replaced with a suitable filesystem path. Where the `lmtp`
system group is employed, it may be replaced with a different group. See the
[[../LMTP|LMTP guide]] for a discussion of LMTP and mail delivery.
== Transports in Exim ==
Example configuration files for Exim are distributed in `conf/exim`:
{{{#!table
'''File''' || '''Purpose'''
==
`30_exim4-config_people`
||<rowspan="3"> Integration of agent programs
==
`30_exim4-config_people_outgoing`
==
`30_exim4-config_resources`
}}}
These files can be incorporated into the Exim configuration. On Debian
systems, they can be copied into `/etc/exim4/conf.d/transport`.
If local SMTP delivery is being used, the `30_exim4-config_people` file (in
`conf/exim`) will need adjusting.
== Transports in Postfix ==
Example configuration files for Postfix are distributed in `conf/postfix`:
{{{#!table
'''File''' || '''Purpose'''
==
`master.cf.items`
|| Integration of agent programs (for inclusion in `master.cf`)
==
`transport`
|| Configuration of agent transports
==
`virtual`
|| Configuration of outgoing mail routing
}}}
These files can be incorporated into the Postfix configuration. On Debian
systems, `master.cf.items` can be merged into `/etc/postfix/master.cf`,
whereas the remaining files would be installed into `/etc/postfix`.
If local SMTP delivery is being used, the `master.cf.items` file (in
`conf/postfix`) will need adjusting.
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