Other free anti spam programs

ChoiceMail is a permission-based e-mail protection program, meaning that people need to be recognized to be able to send you email messages, such as those already in your address book or if you send mail to someone. You can also add or remove addresse manually. Others will have to request permission first. This method is pretty much bullet proof if spam is becoming a real grievance, or if privacy is a big issue.

All-in-One SECRETMAKER considers itself the swiss army knife for the internet. It is a general purpose program composed of many tools against all matters of security and annoyances when connecting to the internet. It has a spam filter, but also an anti spyware, an anti virus and many utilities to reduce the marketing aspect of surfing, like popups, banners, flash blocker, and finally, utilities to protect your browser privacy like a cookie eraser and browsing history cleaner.