Security

Certified Mail
Send free CertifiedMail messages securely and with tracking. The best way to send important messages.
http://certifiedmail.com/

Cobion
With experience in text and imaging analysis the company offers a family of Internet and email filter solutions.
http://www.cobion.com/

CPatrol
GroupWare Security for protecting your networks from various threats.
http://www.cpatrol.com

Panda PerimeterScan Qmail Edition
Based on Panda Antivirus award-winning technology, PerimeterScan Qmail Edition provides performance optimized real-time inbound and outbound virus scanning services.
http://www.pandasoftware.com

PTSMail Utiltities
A set of mail utilities for Unix that work with sendmail to detect viruses and spam. Formerly Known as Scanmail For Unix.
http://www.scanmail-software.com/

Secure Messaging Server
A secure messaging server that provides total control and security for your email system plus some additional messaging products.
http://www.secure-message.com/

Totemo
Trustmail is an email solution that adds secure transmission, sender identification, non-repudation, content security and delivery confirmation.
http://www.totemo.ch