On Fri, Feb 13, 2015 at 04:56:49PM +0100, Robert Dahlem wrote:
> >> /etc/postfix/sender_dependent_transport:
> >> ----------------------------------------
> >> @example.tld smtp_example:
> >
> > Set the relayhost above (smtp_example:[example_server1])
>
> That works now, thank you!
>
> Can I do anything about smtp_fallback_relay here? If example_server1 is
> dead I would like to fall back to example_server2.
So long as the transport in question is used for exactly one set
of destination relays, for which the same set of fallback relay
host applies, you can obviously use smtp_fallback_relay. Both by
name and documentation, that parameter applies to the smtp(8)
delivery agent.
That said, my preference is to encode fallback relays into locally
mastered MX RRsets:
transport:
# Destination # Transport:nexthop
example.com smtp:example.com.localhost
/etc/namedb/localhost:
# "localhost" zone file, mastered by local iterative
# nameserver.
...
example.com.localhost. IN MX 0 mx1.example.net.
example.com.localhost. IN MX 1 mx2.example.net.
example.com.localhost. IN MX 2 mx3.example.com.localhost.
mx3.example.com.localhost. IN A 192.0.2.1
This is far more flexible, and avoids the need for clumsy fallback
relay settings.
--
Viktor.
