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http://www.projecthoneypot.org/index.php
Fight spam in blogs with python
http://www.voidspace.org.uk/python/modules.shtml#akismet
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http://www.spamhelp.org/shopenrelay
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http://xael.org/norman/python/pyclamav
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http://randomthoughts.vandorp.ca/archives/2004/10/07/referer-spam
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http://freshmeat.net/articles/view/964
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http://www.benzedrine.cx/relaydb.html