The #1 Open Source Email Filter

ms_bullet_38x27 Millions of Downloads

ms_bullet_38x27 Powerful Open Source Engine

ms_bullet_38x27 Totally Free

ms_bullet_38x27 Version 5.4.5-3 

MailScanner is a highly respected open source email security system design for Linux-based email gateways. It is used at over 40,000 sites around the world, protecting top government departments, commercial corporations and educational institutions. This technology has fast become the standard email solution at many ISP sites for virus protection and spam filtering.

MailScanner scans email for viruses, spam, phishing, malware, and other attacks against security vulnerabilities and plays a major part in the security of a network. By virtue of being open source, the technology in MailScanner has been reviewed many times over by some of the best and brightest in the field of computer security from around the world. MailScanner supports a wide range of MTAs and virus scanners to include the popular open source Clam AV. Spam detection is accomplished via Spamassassin, which is by far the most popular and standardized spam detection engine.

Our Development Team
Jerry Benton, Mailborder Systems
Mark Sapiro, Mailman Project
Shawn Iverson, eFa Project
Our Founder
Julian Field



The complete guide to installing
and using MailScanner.

by Julian Field

I installed MailScanner in the spring of 2001. Since then no email viruses have gotten through our gateways and the flood of spam has been reduced to a very small trickle. I can absolutely state that spam and viruses can be defeated simply by deploying MailScanner ...  I haven’t gotten a virus in years.
Steve Swaney