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Bill takes a side role in the Spamassassin project by working on the http://www.sa-blacklist.stearns.org/sa-blacklist/ project, now a part of Spamassassin 3.0 as the WS SURBL. He also wrote a Spamassassin install document, found at http://www.stearns.org/doc/spamassassin-setup.current.html .