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Re: How to prevent being a 'bouncer' of evil mail?

On Fri, Jun 25, 2004 at 08:35:52PM -0400, Blu wrote:
> I do that. A call forward to the next server in the chain to verify the
> recipient before accepting the mail from the sender. I use Exim though.
> It even caches the recipient verification results to avoid unnecesary
> traffic. I don't know if it is that easy with postfix, but surely it is
> doable.

It sounds tempting but in my opinion you don't gain much if the
next hop is not the final destination and it does not support
this forward call feature.  Even if it did it could rule out the
mail in question perfectly legitimely based on content analysis
performed in the DATA stage.

Personally, I throw my bets on simple systems.  I think it is
the innocen destination host of the bounce message that should
protect itself from unwanted bounces, for example by dropping
those which refer to message-ids that were not sent by that host.
It seems more practical than expecting every other mail systems
to protect *you*.


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