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FrontBridge utilizes three layers of protection to analyze each piece of email and to detect and act on suspected spam.
Blacklisting: FrontBridge uses a proprietary blacklist. We do not use commercial blacklists such as MAPS and ORBZ/S. Our blacklist contains only the addresses of the most egregious spammers on the Internet. While conservative, our blacklist can immediately block nearly 10 percent of our customer's inbound spam.
Fingerprinting: Messages not blocked by blacklisting are fingerprinted to detect matches with known spam message characteristics. FrontBridge's fingerprinting technology leverages knowledge gained from filtering mail for our entire customer base.
Messages identified as spam are fingerprinted and given a unique id based on their content. If these messages come through our system again, the fingerprint is detected and the message is marked as spam.
Rules-based scoring: FrontBridge assigns scores to messages based on more than 20,000 rules that embody and define characteristics of spam and legitimate email. Points are added to the score if a message contains characteristics of spam; and points are subtracted if it contains many characteristics of legitimate email. When a message's score reaches a defined threshold, it is flagged as spam.