Guardian Digital Upgrades Open Source Secure Mail ServerGuardian Digital Upgrades Open Source Secure Mail Server

Guardian Digital plans on Wednesday to introduce an upgrade to its open-source server suite for secure e-mail.

Secure Mail Suite 3.0 includes filters for spam, viruses and inappropriate content in both incoming and outgoing mail. The software is designed to protect against malicious code, viruses, Trojan horses and mail bomb attacks and denial-of-service threats.

The software is available immediately priced starting at $749.

The software is entirely open source, with the exception of the antivirus engine, which Guardian Digital licenses from Sophos. It runs on Guardian Digital's EnGarde Secure Linux distribution. It uses the PostFix SMTP Server [tm] with significant enhancements by Guardian Digital, and a spam filter developed by Guardian Digital based on Bayesian filtering and SpamAssassin.

"Our entire company is founded on the basis of open source," said Guardian Digital CEO Dave Wreski. "We belive it provides a superior vehicle to controlling security."

Secure Mail Suite is designed to operate as a standalone mail server, or a gateway to route mail to proprietary mail systems such as Microsoft Exchange and Lotus Notes. It scans inbound and outbound mail for spam, viruses, trojan horses, and can be set to monitor for inappropriate or business-confidential documents.

It also provides web-based group collaboration, centralized directory access, and mailing list management.

The software provides authentication and encryption for e-mail connections.

Users can set their own rules for filtering mail on the server based on sender, recipient, content in the message body, and other criteria.