[Dovecot] Antispam only when LMTP delivers some specific messages

[Reindl Harald]

Am 03.08.2012 14:03, schrieb Sandro Tosi:
> We are legally *not* allowed to run antispam on all the incoming messages

you ARE allowed if you are doing it right

right in this context means you have to run the filter
pre-queue and REJECT blocked messages, so the sending
server knows that you did NOT accept the message and
can send a bounce to his user

wrong in this context means you accept the message, filter
it after that and throw it away while the sender has a
confirmed delivery - this is a legal problem in the first
front and technically wrong because you risk to become
a backscatter by starting active bounes on your server
if you are not 100% sure how all the pieces work togehter
and how the whole system acts in each situation

bringing LMTP and Dovecot in the context of spam-filtering
is automatically doing it completly wrong

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