[gentoo-user] Simple SMTP to cmd-line MTA relay?

[Grant Edwards]

I need to setup an SMTP relay server.

It needs to accept messages as an SMTP server (using SSL and AUTH on a
non-standard port) from a single user and single source and then relay
them by passing them to a command-line MTA (e.g. /usr/bin/sendmail
replacement provided by msmtp).

It only needs to handle a few messages per week, and doesn't need to
handle more than one connection at a time.

 exim?
 postfix?       
 emailrelay?

What I can't figure out for the above is how you configure them to
send the mail using a command line MTA like /usr/bin/sendmail or
/usr/bin/msmtp instead of initiating a network connection to an SMTP
server.

I'm currently using something I wrote in Python, but the SSL support
in the 3rd party SMTP module is broken and I don't relish trying to
fix it.

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