Hans Krueger skrev den 2013-12-21 22:58:
registered Linux user 289023
if you DNAT port 25, then you must tell postfix is works behind NAT
man 5 postconf
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.
Example:
proxy_interfaces = 1.2.3.4
