View source for Taxonomy of anti-spam techniques

Many people have invented many anti-spam techniques over the past decade.  And a lot of the techniques keep being reinvented. Our goal here is to list all the anti-spam techniques we know, both the good ones and the bad ones.
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==Message content techniques==

* [[Static filters]]

* [[Adaptive filters]]

==SMTP techniques==

* [[Timing and protocol defects]]

* [[Greylisting]]

==Network techniques==

* [[DNS blacklists]]

* [[Tarpitting and other timing techniques]]

==Whitelist techniques==

* [[Recognizing known correspondents]]

* [[Recognizing known responsible parties]]

==Introduction techniques==

* [[Challenges]]

* [[Proof of work]]

* [[Postage]]