49 votesAdministrator commented
I'd like to add, that this is still an issue. Kerio Connect before (and now with Bitdefender) does a great job finding spam, but there is no big benefit due to the fact, that we still need to accept all the mails. Blocking must be disabled because the mails already got accepted when many of the anti spam mechanisms take place. So the user still gets all the spam mails in his junk mail folder.
It would be much nicer if the communication would go like this:
1. smtp connection start
2. receive mail
3. check for spam (spam assassin, bitdefender, bayes, custom filter rules, server based filters)
4. tell other server if we accept or decline
5. smtp connection stop
This request is being reviewed.