I would say a better solution that blocks would be header/body based phrase and word matching on a weighting system like spamassassin provides. The False positive rates for such a system are MUCH lower than what you could ever hope for with a blacklist. Also regarding Inflow. They have been warned, notified, complained to, etc. countless times with ZERO attempt to police their users.
If you doubt this just look at this: http://groups.google.com/groups?as_q=inflow&num=10&as_scoring=r&hl=en&ie=ISO-8859-1&btnG=Google+Search&as_epq=&as_oq=&as_eq=&as_ugroup=news.admin.net-abuse.*&as_usubject=&as_uauthors=&as_umsgid=&lr=&as_qdr=&as_drrb=b&as_mind=1&as_minm=11&as_miny=2002&as_maxd=28&as_maxm=12&as_maxy=2002&safe=images It clearly shows that Inflow has no reason or desire to police their users. Harry Tabak wrote: <Snip> -- Colin Faber (303) 736-5160 fpsn.net, Inc. * Black holes are where God divided by zero. * -> SPAM TRAP ADDRESS - DO NOT EMAIL <- [EMAIL PROTECTED] -> SPAM TRAP ADDRESS - DO NOT EMAIL <- To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-questions" in the body of the message