Hi...You might want to give MailWasher a look see. I downloaded it only a few days ago and already I can see a big difference in my spam mail. It bounces spam mail back to the sender and therefore they think they have an invalid address. It has a very easy to use interface and it can be configured to your likes or dislikes. It's free and not a big program.
http://www.mailwasher.net
I hope this will help you!