Mail Call is a free program that PC Magazine editors wrote. Its not an official anti spam program but it works none the less. Mail Call is very small and runs quietly in the background. When I first log onto the internet, it pulls up a list of emails waiting for me to download from the ISP server. I'm able to knock out spam on the server before it comes into my computer. Its fast and efficient way to deal with spam.
http://www.pcmag.com/article2/0,4149,31389,00.asp
Also here is a link to PC World magazine's page on dealing with spam. They have great tips there.
http://www.pcworld.com/resource/spamwatch/0,00.asp
I hope this helps,
Glad