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Re: Sender access restrictions by connecting back to the MX/A server(s) - An example
From: Wietse Venema (wietse
porcupine.org)
Date: Thu Oct 02 2003 - 07:13:36 CDT
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Guido Van De Velde:
> I take one example about what happens : a mail coming from one of our
> internal systems, onyx.arts.kuleuven.ac.be . The mail has a from=
> useronyx.arts.kuleuven.ac.be This host has several mx's :
>
> IN MX 5 onyx.arts.kuleuven.ac.be.
> IN MX 10 limbak.cc.kuleuven.ac.be.
> IN MX 10 kromsin.cc.kuleuven.ac.be.
> IN MX 20 cavin.kuleuven.be.
> IN MX 30 cavin01.kuleuven.be.
> IN MX 30 cavin02.kuleuven.be.
> IN MX 30 cavin03.kuleuven.be.
>
> Four of them are reachable from the Internet, the highest priorties
> aren't. The from address exists, bounces/replies _do_ come back (for
> those who don't stick to only the first mx), but the "callback" fails,
> so the message is refused...
Your example is not applicable. Postfix uses the exact same code
for probing as it uses for delivering of real email or bounces.
Wietse
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