lutz.niede...@gmx.net:
> > The best solution is to use MX records; that's what they're for.
> >
> > Alternately, look at
> > http://www.postfix.org/postconf.5.html#smtp_fallback_relay
> >
>
> Sure. But this is not exactly what I'm looking for.
> We need a way to specify a second relay if the first does not answer. At
> this point we don't examine MXs yet. We push all mail to the relay #1. This
> relay #1 looks at MXs.
> We would like to push to relay #2 if relay #1 is not available.
/etc/postfix/main.cf:
relayhost = relay.example.com
Where relay.example.com resolves to one or more A records.
Alternatively:
/etc/postfix/main.cf:
# The [] prevent MX queries.
relayhost = [relay1.example.com]
smtp_fallback_relay = [relay2.example.com]
Or:
/etc/postfix/main.cf:
# No Postfix DNS queries.
relayhost = relay1.example.com
smtp_fallback_relay = relay2.example.com
smtp_host_lookup = native
Options abound.
Wietse
