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Hexamail Guard is a server based software antispam filter for the Windows and Linux platforms.

Acting as a gateway at the SMTP level or as a plugin for Microsoft Exchange Server, it supports most common anti spam filtering techniques including:
* Bayesian pattern matching.
* Keyword/String/Expression.
* Header checks.
* DNS based blocklists.
* URL blocklists.
* Image analysis.
* Sender analysis using neural network.
* Cloaking/Phishing detection.
* Challenge-Response.
* Blacklisting.
* User-configurable whitelists.
* Automatic Internet updates to blocking features.
* Optional antivirus scanning.

In addition it supports external POP3 account downloading and filtering, a spam quarantine with multiple options for processing including: listing, forwarding, blocking, marking/tagging and deletion. Users can review their own spam through a web-based quarantine view.

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