spamhaus

from Jargon File (4.4.4, 14 Aug 2003)
spamhaus
 spam'hows, n.

   Pejorative term for an internet service provider that permits or even
   encourages {spam} mailings from its systems. The plural is spamhausen.
   There is a web page devoted to tracking spamhausen.

   The most notorious of the spamhausen was Sanford Wallace's Cyber
   Promotions Inc., shut down by a lawsuit on 16 October 1997. The
   anniversary of the shutdown is celebrated on Usenet as Spam Freedom
   Day, but lesser imitators of the Spamford still infest various murky
   corners of the net. Since prosecution of spammers became routine under
   the junk-fax laws and statues specifically targeting spam, spamhausen
   have declined in relative importance; today, hit-and-run attacks by
   spammers using {relay rape} and {throwaway account}s on reputable ISPs
   seem to account for most of the flow.
    

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