From: Wietse Venema (wietseporcupine.org)
Date: Thu Apr 01 2004 - 14:41:43 CST

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Marc Cuypers:
> I want to override all domains that are hosted by a certain provider,
> so I don't know which domains that will be. Only at the moment the mx-
> record is resolved I know it's a mail-server of that provider, and at
> that moment I can decide to direct the e-mail via another mail-server.
> Can this be done with the transport-map? If not, can it be done?

This has nothing to do with MX lookups, and therefore the whole MX
issue is a red herring.

If mail for some IP address must be redirected to a different IP
address, then use IP address redirection (masquerading).

With ipf, one would specify:

    rdr fxp0 1.2.3.4 port 25 -> 2.3.4.5 port 25 tcp

This is just one of many possibilities to solve the problem at the
IP level.

        Wietse

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