Spam Filtering Service

• Spam filtering services offered by many retail isps, commercial online spam-filtering services (such as spamcop), mda-based procmail scripts, or packages like spamassassin, are all examples of on-network filtering.
• A week later, the user doesn't understand why their account has been shut down for spamming.
• False positives (a non-spam e-mail message that is falsely tagged as a spam message by a spam filter) can be more worrisome than false negatives because they might represent important personal communications that the recipient might never see unless he carefully examines the messages trapped by his filter.
• It may have some of the same capabilities as a mail transfer agent, but is mainly used for POP3 or IMAP mail pickup, and may add special capabilities such as spam filtering.
• Everyone gets spam and we all hate it.
• Spam: The word comes from an old monty python skit where some folks in a diner are unable to have a conversation because a group of vikings at a nearby table keep singing the "spam" song.
• Spam: The term "spam" was previously more general in meaning, referring to any sort of unwanted or off-topic traffic on usenet or mailing lists; then, it narrowed to refer mainly to unsolicited bulk commercial e-mail.
• Lately the meaning of "spam" is again expanding to include other forms of objectionable internet advertising such as "link spam," "blog spam," or "search engine spam.
• "Spamarrest: A challenge response spam filtering solution.
• Most modern e-mail client programs can understand and render html-formatted mail messages and most spams are now delivered in html form.
• Occasionally, spammers will use html ces to disguise the contents of their messages during transit.
• Unless we all try to fight spam it will only get worse.
• Graylisting is a technique used by a mail exchanger host to defend against spam deliveries by temporarily rejecting all mail from unrecognized sources.
• On-network filters offer the advantage that the user does not have to download messages identified as spam to his own computer, but it requires that the user periodically inspect the trapped or detained mail to report it or to release "false positives" (nonspam messages erroneously identified as spam).

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