Open Relay Filter Enterprise Edition is an enterprise-level anti-spam solution that helps you to block spam before it reaches your network. ORF uses DNS blacklists (DNSBL/RBL databases like MAPS) and has its own tools to stop spam on SMTP protocol level.

Open Relay Filter Enterprise Edition Main Features:

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ORF can be used with the Windows 2000 built-in IIS SMTP Service and Microsoft Exchange 2000 servers (which use this service for SMTP communication)

The interface is simple and powerful

easy to use

powerful