I used to bounce spam but after reading a bit about the % of originators that get their own back being very low - only 1 or 2% - I came to the conclusion that bouncing is probably a waste of bandwidth.
I'm a beta tester for Mailwasher and I get to play with unreleased versions. One that's coming up is
very nice. It lets you auto delete from your ISP's mail server mails from senders on your personal blacklist, from senders on remote free blacklists, from senders on remote subscribed blacklists and from a database of spam and senders under development by the Mailwasher folk. If you want to auto bounce them, you can.
If you wish, you can tick a box so that you never see the stuff.
Friendly (of course), doubtful and unidentified mail is still presented to you for manual sorting.
I have been using the betas for months and have not had a false positive (ie, a false indication of spam). I get 200 spams a day. MW has cut that down to about 20. Fabulous, simply fabulous. It is comprehensively THE BEST spam tool I have ever tried.
www.firetrust.com for details.
AA