Cactus Spam Filter is a free easy-to-use spam blocker. It protects your inbox by learning to detect spam as its being used. After a short while it has adapted to your personal mailbox and blocks out most of the junk e-mail. Since the filter becomes personal, spammers will not be able to fool it. Installation is very simple. No setup is required in your e-mail client; this spam stopper integrates seamlessly with all e-mail clients that use POP3.
Cactus Spam Filter has been successfully tested with Microsoft Outlook, Microsoft Outlook Express, Netscape, Opera, Mozilla, Mozilla Thunderbird, Eudora, Pegasus Mail, IncrediMail, Foxmail, POP Peeper, Command Line POP Client and Phoenix Mail. This anti-spam program learns to detect spam as its being used, and believe me, Cactus Spam Filter is a fast learner.

After a few e-mails it will start to make its own decisions to relieve you from the spam burden. Even though this is a brutal, merciless spam killer, no e-mails will get lost unless you delete them. One of the unique features of Cactus Spam Filter is the ease of use. After you have downloaded and installed it no more settings are required! No account setup, no POP proxies, nothing! Just start your favorite e-mail program and Cactus Spam Filter will instantly protect it!

The license of this software is Freeware, you can free download and free use this anti spam software.