From Citizendium, the Citizens' Compendium
- The content on this page originated on Wikipedia and is yet to be significantly improved. Contributors are invited to replace and add material to make this an original article.
A wide variety of techniques that have been developed to protect email users from Unsolicited Bulk Email (UBE or spam).
- http://en.wikipedia.org/wiki/Anti-spam_techniques Anti-Spam Techniques
- http://www.dontbouncespam.org - definition of "bounce spam" needed in "Email system" article.