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