postfix-users October 2010 archive
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postfix-users: Re: Postfix as MX fallback

Re: Postfix as MX fallback

From: Christoph Petersen <lists_at_nospam>
Date: Mon Oct 04 2010 - 16:54:30 GMT
To: Postfix users <postfix-users@postfix.org>

>> Thanks for the reply. Is there a way to query DNS if the specified MX is
>> present so I do not have to maintain the list of allowed domains?
>
> I send lots of spam, and I configure DNS such that the sender domain
> of my spam resolves to your MX (*). Would you please receive millions
> non-deliverable mail notifications for me?

Yes. I was looking for a very short term (1-2 hours) fix for the
problem. I decided to go for a better approach and have the list of
allowed domains generated automatically so there is basic protection
against the semi-openrelay described above.

>
> Thanks for helping out.
>
> Wietse
>
> (*) I'll be happy to provide a bogus primary MX address that never
> responds.

BR
Christoph