Description:

MailScanner is a freely distributable E-Mail gateway virus scanner and
spam detector. It uses Postfix, sendmail, ZMailer, Qmail or Exim as
its basis, and a choice of 22 commercial virus scanning engines to do
the actual virus scanning. It can decode and scan attachments
intended solely for Microsoft Outlook users (MS-TNEF). If possible, it
will disinfect infected documents and deliver them automatically. It
provides protection against many security vulnerabilities in
widely-used e-mail programs such as Eudora and Microsoft Outlook. It
will also selectively filter the content of email messages to protect
users from offensive content such as pornographic spam. It also has
features which protect it against Denial Of Service attacks.

After installation, you must install one of the supported commercial
anti-virus packages.

This has been tested on Red Hat Linux, but should work on other
RPM-based Linuxes. Read "man rpm" if you have dependency problems.