SpamAssassin

Use this program to "Unspam" your mailbox(es). The program can be integrated with the mail server to automatically filter all mail for a site. It can also be...

Free Open Source Linux

Mailwasher

Over 8 million people use MailWasher as their spam filter Introducing MailWasher, the leader in spam filter software, and the easiest way to check and manage your...

Freemium Windows Linux

POPFile

POPFile classifies email into categories you define. It can sort into spam and not spam or into any number of categories you like (e.g. work, personal, important...

Free Open Source Mac Windows Linux

SPAMfighter

SPAMfighter is a free spam filter for Microsoft Outlook, Outlook Express, Thunderbird, Windows Mail and Windows Live Mail, that automatically and efficiently filters...

Freemium Windows

SpamSieve

Save time by adding powerful spam filtering to the e-mail client on your Mac. One of the only standalone spam filtering softwares for Mac.

Commercial Mac

Spamihilator

Spamihilator works between your E-Mail client and the Internet and examines every incoming E-Mail. Useless spam mails (Junk) will be filtered out. This process runs...

Free Windows

Spamfence.net

Professional e-mail security free for private use: With Spamfence.net eleven offers the professional e-mail security of the spam filter and e-mail categorisation service...

Free Personal Web

Postini

Postini is an E-mail and Web security and archiving service owned by Google since 2007. It provides cloud computing services for filtering e-mail spam and malware...

Commercial Web

BullGuard Spamfilter

Most people find spam e-mails the biggest nuisance on the Internet. Today, spam e-mails account for over 80% of all e-mail traffic and their volumes increase daily....

• Discontinued BullGuard Spamfilter was discontinued on 12 July 2013. The product is no longer available on the official website.

Free Windows Microsoft Office Outlook Thunderbird

Spamato

Spamato is a spam filter system that combines several anti-spam techniques, from which thousands of users benefit. It is available as an add-on for Thunderbird and...

• Discontinued The project is no longer developed. Last version, 0.99.9, released in August 2007, can be still downloaded from SourceForge.

Free Open Source Mac Windows Linux

SpamBayes

The SpamBayes project is working on developing a statistical (commonly, although a little inaccurately, referred to as Bayesian) anti-spam filter, initially based on the...

Free Open Source Mac Windows Linux IncrediMail Microsoft Office Outlook ... Thunderbird Microsoft Outlook Express Windows Live Mail

Postgrey

Postgrey is a Postfix policy server implementing greylisting developed by David Schweikert.

Free Open Source Linux Self-Hosted

K9

K9 is an email filtering application that works in conjunction with your regular POP3 email program and automatically classifies incoming emails as spam (junk email) or...

• Discontinued The project is no longer developed. Last version, 1.28, released in April 2004, can be still downloaded from the official website.

Free Windows

xTerminator

This program helps you block spam and worms before they reach your mailbox.

Free Windows