Proxy_interface – Postfix

proxy_interfaces (default: empty)

The network interface addresses that this mail system receives mail on by way of a proxy or network address translation unit. This feature is available in Postfix 2.0 and later.
You must specify your “outside” proxy/NAT addresses when your system is a backup MX host for other domains, otherwise mail delivery loops will happen when the primary MX host is down.


proxy_interfaces =

If you miss this step, you’ll see messages like this in your log file:

Apr 8 20:10:14 hades postfix/smtp[1908]: 08CABB59: to=,[]:25, delay=1.4, delays=0.39/0.01/0.99/0, dsn=4.4.6, status=deferred (mail for loops back to myself)

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