Spam Blocker - Spam filters, also called spam blockers or anti-spam software, is used to separate your legitimate e-mail from spam emails. Each spam filters vary in their ability and the way they detect and remove spam. Every day millions of spam and dangerous virus emails are sent out around the world. Without effective spam blockers and virus protection you are leaving your computer open to attack.

Spam blocker deletes unwanted e-mails before you download to your computer. Spam filter gives you the ability to set rules about which email you want to receive in your inbox, reject or delete, put in a certain folder or quarantine for you to look through at your own discretion. You should be able to set up blacklists and white lists and most importantly it should work with the email service that you use. Take control of your email inbox and bock unwanted spam and malicious content out. Spam scams are here to stay, so fight back with a powerful spam filter.                                                                              

MailWasher - Best Free aggressive desktop spam filter. MailWasher uses whitelist, blacklist, database and learning filters to filter e-mail before it reaches a user's inbox. While it requires some initial training to learn what you consider to be spam, MailWasher eventually achieves a very high accuracy rate. Because of its aggressive approach, it also generates false positives. Most reviewers find Windows-only MailWasher to be easy to use and like the fact that it works with most e-mail programs.

OnlyMyEmail - Best web-based spam filtering service. OnlyMyEmail is strongly recommended in several reviews, but the service has some detractors, too. Since OnlyMyEmail isn't downloaded to your computer, system performance isn't impacted and spam never makes it to your computer. You can direct up to two e-mail accounts to OnlyMyEmail, where your mail is filtered and sent to your OnlyMyEmail address (which you can then direct to your desktop e-mail client). Reviews say OnlyMyEmail is amazingly accurate, with an extremely low occurrence of misidentified legitimate mail. OnlyMyEmail will work with any operating system.

Cloudmark - Best low-risk anti-spam software. Reviews like the community-based approach taken by Cloudmark Desktop, which uses an ever-growing database of known spammers to filter messages. More than a million program users send information to Cloudmark, which comes in separate versions for Outlook (version 5.3) and Outlook Express (3.2.2). Because no spam filter is perfect, you will still get some false positives.

CA Anti-Spam - Best whitelist spam filter. CA Anti-Spam allows mail from people you know (your whitelist) and quarantines everything else. Though the very latest version is yet to be reviewed, experts say the whitelist filter used in CA Anti-Spam is highly effective. However, they add that whitelist filtering works best for people who only receive mail from people they know, and that it isn't the best choice for those who often receive legitimate mail from e-mail addresses that aren't in their contacts folder. The whitelist method of filtering should block all spam, but when used exclusively, it will also block the highest percentage of legitimate mail. For that reason, experts either love or hate CA Anti-Spam.

POPFile - Free spam blocker. Reviewers say that that POPFile is better than most other free spam blockers, and at least one rates it ahead of any of the many commercial programs he's reviewed. However, POPFile can be intimidating for novices, and it requires a fair amount of training before it learns what you consider to be spam. POPFile also takes some knocks for creating system drag. POPFile is an open-source program that works with all operating systems.