From: Victor Duchovni (Victor.DuchovniMorganStanley.com)
Date: Fri Mar 17 2006 - 08:07:08 CST

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On Fri, Mar 17, 2006 at 10:00:40AM +0100, Frank Bonnet wrote:

> Is it possible to have on the _same_ machine (same IP address)
> one SMTP Postfix instance to receive emails (and not to send)
> one SMTPS Postfix instance to send emails ?

Yes. Each Postfix instance needs its own configuration directory and its
own spool directory. Setting "syslog_name" to an instance specific value
is also highly recommended. Naturally no two instances can listen on the
same IP address and port. On many operating systems wildcard bindings
(*:25) are mutually incompatible with more specific bindings (IP:25).

To start a secondary Postfix, use "postfix -c /second/config start".
To enable setgid (postdrop/postqueue) access to the secondary queue
list the secondary configuration directory in the primary (/etc/postfix)
main.cf under the alternate_config_directories parameter.

Decide which instance handes locally submitted mail (cron, logged-in
users, ...) and make sure that is is the one that resides in /etc/postfix
(i.e. the compiled-in defaulf configuration directory as reported by
postconf -dh config_directory).

--
        Viktor.

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