> > We do have two external mail relays (MX 10 mx1 & MX 20 mx2) that accept
> mails for our domains, do lots of checks and relay them via a secure
> channel through the firewall into our network. Inside and outside we use
> postfix.
> >
> > When sending mails out, we use the same way: send them from our internal
> network to one (mx1 only) of our mail relays via secure channel. This
> external postfix does - again - a lot of thing like DKIM etc. This outside
> postfix on mx1 then sends mails into the world.
> >
> > The internal postfix sends the mails to mx1 using "default_transport"
> (using a customized incarnation of smtp in master.cf).
> >
> > What we thought is that we could use mx2 for outgoing mails, too. This
> would be wise if mx1 is down (what sometimes really happen).
> >
> > But I find no setting like "fallback_default_transport" that can be used
> like default_transport in case our default_transport does not answer.
> >
> > Can anyone please tell me how we can establish a backup link to our mx2
> working like default_transport for the cases where mx1 is not available?
> >
>
>
> 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.
And we need to use a customized transport. We cannot do that with
smtp_fallback_relay.
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