> > Is there any way to put a (cryptographically signed) certificate
> > into the header at the first scan like this "Already checked" ?
> > This mark could be recognized in all the following rounds so
> > amavisd could pass the message without further checks.
> > 
> > A simple "Received: by ..." header is not enough because it can be
> > forged easily by impostors.
> 
> If you are using Postfix, try setting the transport map to feed directly to 
> high-port postfix for emails that match certain criteria (header_check or 
> something like this).
> If you are using mailman as maillist manager, try setting the smarthost to 
> high-port postfix as well.

MTA1 is postfix, MTA2 is exim. (MTA2 runs on mail server host together
with mailman.)
In the above scenario MTA1 checks mails twice and MTA2 once.

You are right: 2 of 3 checks can be eliminated in such a way. Thanks.

However I'm interested in a more general solution.
In the near future 6 further (high traffic) MTAs will use the central
spamfilter service. If I do not do something the same mail may be
checked even four times while circulating between MTAs.

Reconfiguring N administratively independent MTAs in order
to know (when) what peers use the same spamfilter is an o(N*N) job.

Gabor

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