• Amavisd Virus Scanner
  An open source virus scanner, Guardian Digital implemented Amavisd to work seamlessly with Sophos anti-virus system providing users with bulletproof security from virus threats.
  
  
  
  
• Ecartis List Server/Mailing List Manager
  Ecartis is an open-source software package that administers mailing lists. This innovative open source project provided the basis for the Secure Mail Suite Secure List Port, allowing users to configure, manage and send emails to subscribers on an organizational mailing list.
  
  
  
  
• Squirrelmail Webmail
  A standards-based open source webmail package designed to give users access to email from anywhere. Utilizing Squirrelmail, Guardian Digital Secure Mail Suite offers users the convenience of retrieving and sending business critical email messages securely from the Internet.
  
  
  
  
• OpenLDAP Directory Service
  The OpenLDAP Project is a collaborative effort to develop a robust, commercial-grade, fully featured and open source LDAP suite of applications and development tools. Guardian Digital uses pieces of the OpenLDAP project to provide its customers with the ability to access directory services from any client.
  
  
  
  
• SpamAssassin Anti-spam Application
  SpamAssassin is a highly respected open source project which uses it uses a wide range of heuristic tests on mail headers and body text to identify unsolicited commercial email. Utilizing a number of spam identification tactics, SpamAssassin along with other innovative spam combating components of Secure Mail Suite determines, with pinpoint precision, whether incoming messages are legitimate or unsolicited mail.
  
  
  
  
• Postfix Mail Transport Agent
  A widely used and highly compatible sendmail program, the Postfix project provides Guardian Digital developers with the resources they need to ensure essential corporate email communications are always securely sent to the intended recipient.
  
  
  
  
• Fetchmail Retrieval System
  Fetchmail is an open source mail retrieval system. Guardian Digital implemented resources from the Fetchmail project in Secure Mail Suite to retrieve mail from remote mail servers and forward it via a secure connection so it can then be read by normal mail user agents.
  
  
• ClamAV Anti-virus Application
  Clam AntiVirus is an open source anti-virus toolkit. Clam, along with Guardian Digital's in-house security expertise provides bulletproof security for email borne viruses.
  
  
• MoreGroupware Web-based Group Collaboration
  more.groupware is an open source web-based group collaboration application. Containing modules like contact management, webmail, calendaring, Guardian Digital was able to utilize their initial framework to create the powerful security and functionality brought to consumers with the Guardian Digital WebShare Manager.
  
  
  
  
• MRTG Traffic Monitor
  The Multi Router Traffic Grapher (MRTG) is an open source tool implemented throughout Guardian Digital's secure solutions to monitor the traffic load on network links allowing users to graphically observe a live representation of this traffic.
  
  
  
  
• MailGraph Email Statistics
  Mailgraph is a very simple, but sophisticated, open source application that provides comprehensive e-mail statistics for Postfix programs producing daily, weekly, monthly, and yearly graphs of received/sent and bounced/rejected mail. Guardian Digital Secure Mail Suite utilizes the resources of Mailgraph to provide users with a comprehensive look into their organization's email usage.
  
  
• Pine Mail Email Client
  Pine is a full featured, industry-standard open source email client. As a significant part of Secure Mail Suite, Pine provides time-tested results and requires very little overhead.