Anti-spam techniques

A wide variety of techniques that have been developed to protect email users from Unsolicited Bulk Email (UBE or spam).

• [Anti-Spam Techniques] [r]: Add brief definition or description

 http://www.dontbouncespam.org  -  definition of "bounce spam" needed in "Email system" article.
 http://en.wikipedia.org/wiki/Spam_filter

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Email challenge-response
Email greylisting