I would have to say from all the different programs out there TheBat fullfills the Filtering end of things better then most others. Spam is a problem that everyone has, even I have that problem and running a support office we get tons of spam everyday. We have however managed to setup filters that catch this. It is a very time consuming process however if you get them setup correctly then, you'll have your own spam filter within TheBat. It is however an on-going battle.

Some suggestions to reduce spam:

1. Turn off "catch-all"
2. Filter out general words "Viagra" and variations like "V1agra"
3. Look into 3rd party spam filters that will either a) plug into theBat or b) something that you can connect to and have certain control over your filters possibly providing a score and then using TheBat to further find the "SPAM SCORE" header and if it's greater then X then throw it in the trash.

Nick