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Clam Antivirus is a GPL anti-virus toolkit for UNIX. The main purpose of this software is the integration with mail servers (attachment scanning). The package provides a flexible and scalable multi-threaded daemon, a command line scanner, and a tool for automatic updating via Internet. The programs are based on a shared library distributed with the Clam AntiVirus package, which you can use with your own software. Most importantly, the virus database is kept up to date.

Command-line Scanner Fast, Multi-threaded Daemon Milter interface for sendmail Database updater with support for digital signatures Virus scanner C library On-access scanning Detection of over 33000 viruses, worms and trojans Built-in support for RAR (2.0), Zip, Gzip, Bzip2 Built-in support for Mbox, Maildir and raw mail files Built-in support for files compressed with UPX, FSG, and Petite

MailScanner is already a highly-respected open source e-mail security system, with more users than AOL and Hotmail combined, and this new release increases its stability and performance. It processes 500 million e-mail messages every day, removing 2 million viruses and identifying 75 million spam messages. MailScanner is used at 20,000 sites around the world protecting top government departments, commercial corporations and educational institutions. It is becoming a standard feature of many ISP's as virus protection and spam filtering are now essential requirements for most users.

MailScanner scans all e-mail for viruses, spam and attacks against security vulnerabilities. It is not tied to any particular virus scanner, but can be used with any combination of 14 different virus scanners, allowing sites to choose the "best of breed" virus scanner. Being open source, site administrators can audit and verify the integrity of the system. Its role is a major part in the security of a network, and so it must act as a trusted service.

MailScanner Advantage: Scans e-mail for viruses using any combination of up to 14 different virus scanners Automatically updates all installed virus scanners every hour, by default Identifies over 95% of spam using several techniques, including highly advanced heuristics Spam can be tagged, rejected, discarded, archived or forwarded to other addresses for inspection by administrators Pornographic spam can be stripped of all graphical content, protecting users from obscene content Scans e-mail for attacks against security vulnerabilities in popular e-mail applications, automatically correcting messages "on the fly" whenever possible and quarantining dangerous sections of other messages Robust: Protects itself against "Denial of Service" attacks and operating system resource leaks