From: Rob Foehl (rwfloonybin.net)
Date: Fri Jul 02 2004 - 10:26:53 CDT

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On Fri, 2 Jul 2004, Florian Effenberger wrote:

> Hi Victor,
>
> > Please stop the pointless questions. Amavis is content filter, not a
> > transparent proxy! DON'T USE amavis-new AS A PRE-QUEUE PROXY!
>
> Yes, I know. Let me explain my situation: I have a mail server for an
> environment where messages shouldn't be dropped at all cost. That means,
> sending no non-delivery notifications is BAD for me. Sending
> non-delivery notifications is bad as well, as everyone here knows the
> forged sender problem.
>
> So I wanted something that already blocks in the SMTP session, so the
> remote SMTP server is responsible for the delivery notification and I
> don't send out to forged addresses.
>
> Is there anything else you can suggest than amavisd-new?

Why not use the existing capabilities of the software to meet your
requirements? You want to avoid sending backscatter (and rightly so), and
you want to ensure that no mail is discarded by your systems. Have
amavisd-new quarantine the mail it would otherwise discard, and inspect
the quarantine periodically.

If your requirements are really "accept or reject, no other options",
you'll have to accept and deliver (and optionally tag) anything
amavisd-new would otherwise quarantine/reject. Content filters are
usually heavyweight apps (amavisd-new definitely qualifies), and therefore
are not well suited to being up-front SMTP proxies.

-Rob

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