Spam Filtering

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Before email ever enters your network, Sprint Data Centers run each message through three layers of advanced spam-filtering technologies:

• Blacklisting is the primary filter that blocks messages from known email abusers based on our proprietary custom list. Unlike public blacklists that follow a "block first, ask questions later" philosophy, the Sprint list is verified and accurate. We understand that blocking legitimate email is worse than allowing spam.
• Fingerprinting matches electronic fingerprints of known spam messages against inbound email, which accounts for high intercept rates against difficult-to-detect spam.
• Heuristic screening (rules-based scoring) matches messages against a database of more than 10,000 rules, and mathematically evaluates specific characteristics to determine whether the message is spam. This sophisticated approach results in a very low false positive rate (less than one in 250,000) while maintaining a high detection rate.

Identifying and Processing Spam

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