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ORF 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. Also offers keyword and attachment filtering.
ORF can be used with Windows 2000 built-in IIS SMTP Service and Microsoft Exchange Servers (which use this service for SMTP communication).
Download Open Relay Filter Enterprise Edition
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