What are some alternatives?
When comparing POPFile and Spamfence.net, you can also consider the following products
Spamihilator - The free Anti-Spam-Filter Spamihilator removes more than 98% of spam mails before they even get into your inbox.
Mailwasher - Over 8 million people use MailWasher as their spam filter
Spam Reader - Spam Reader is a free anti-spam add-on for Microsoft Outlook.
SpamSieve - Save time by adding powerful spam filtering to the e-mail client on your Mac.
SpamBayes - The SpamBayes project is working on developing a statistical (commonly, although a little...
BullGuard Spamfilter - Most people find spam e-mails the biggest nuisance on the Internet.