(The Spamhaus Project, www.spamhaus.org) An organization devoted to eliminating spam and tracking its worst offenders. Based in Geneva and London, Spamhaus maintains several "block lists;" for example, the Spamhaus Block List (SBL) contains the IP addresses of known spammers, and the Exploits Block List (XBL) is a list of compromised computers that send spam without the owner's knowledge.
Pronounced the same, the German word for house is "Haus." Therefore, in German, a spamhaus is an organization that sends out spam. See ROKSO