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It is the concept of detecting and intercepting unwanted bulk mail — or “spam” — before it reaches a recipient’s mailbox. Spam filters detect bulk mail through the occurrence of certain phrases and known as spammer IP addresses in incoming mail. However, because distributors of spam are increasingly innovative in their efforts to circumvent the spam filters that protect email users’ mailboxes, spam is a running target, and developers of spam-filtering technology are constantly being challenged in their quest to keep the bulk-mail onslaught at bay. Thus, in order to effectively shield email users from spam, a spam filter must be flexible. The Spam filter enables users to personalize the filter by training it to detect and intercept mail that fit each user’s particular preference and definition of spam.
