SAN FRANCISCO (11/17/2003) - Anti-spam solutions use a variety of techniques to check the contents of e-mail, gathering information from all parts of the message including the header, body, and any attachments. A basic technique of spam filtering involves checking the header of the message for the IP address of the original sender and comparing it to a whitelist or blacklist. Blacklists are lists of addresses of known spammers, and whitelists are lists of senders whose e-mail should be allowed through even if it appears to be spam. The filter may also look for signs that the message header has been forged to hide the original sender.
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