ddougan
> According to the second screen, you can "Input the > email address, domain, or IP address",
...and indeed it does say that too...hmmm
> although I don't believe the IP blocking works
To state the obvious, you did select Black list ?
Also keep in mind that although the screen words say "reject" a blacklisted address message, that is not correct. The message will be tagged as spam and moved to the junkmail folder (if selected).
This is done at final delivery by procmail, which means these messages will still be passed to the virus scanner and therefore get quarantined if they have a virus.
So using the Black list settings in the Spam filter panel does NOT reject messages (as suggested).
I proved this by testing it with email addresses.
If you implement the Virus & File filtering and RBL list rejection techniques, then that should take care of a lot of incoming rubbish. Even if you get a lot on one day, the chances are that the external sending IP will get listed on RBL's within a few hours, so therefore future messages from that IP will get rejected tommorrow if they send from the same IP.