ePrism User Guide - EdgeWave

Anti-Spam Features
Anti-Spam Feature Overview
The following sections provide an overview of ePrism’s Anti-Spam features.
ePrism’s Anti-Spam Tools
ePrism contains built-in spam controls that have been developed to take advantage of its extensive
mail control features. ePrism provides flexible tools for creating local exceptions, managing
whitelists and blacklists, and controlling undesirable content.
ePrism’s anti-spam controls include the following features:
• RBL (Realtime Blackhole Lists) to reject known spam sources.
• DCC (Distributed Checksum Clearinghouse) to control bulk mail.
• STA (Statistical Token Analysis) for advanced statistical analysis.
ePrism works by applying increasing levels of filtering as follows:
1. Filter message based on the server sending the initial connection request.
2. Filter message based on message envelope contents.
3. Look up the source server in the RBL lists.
4. Determine if the message is bulk-mail via DCC.
5. Apply sophisticated analysis to the content via STA.
Flexible dispositions enable the filtered mail to be quarantined, rejected, or classified in the subject
header to be captured by the mail client.
See “ePrism Anti-Spam Controls” on page 102 for detailed information on configuring ePrism’s
built-in anti-spam features.
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