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Re:Spamhaus Nightmare: Domain Shut Down, No Notice, Over A M... by elliottcarlson on Friday December 30, 2011 @02:17PM (#3408730)
They also go after places that enable spammers - such as when they blocked Google Docs [1]

http://news.softpedia.com/news/Spamhaus-We-Blocked-Google-Do...

Re:Spamhaus Nightmare: Domain Shut Down, No Notice, Over A M... by whortleberry on Friday December 30, 2011 @08:31PM (#3409805)
They added Google Doc ip addresses to their RBL, so that SMTP traffic from those IPs would be blocked by those who chose to run Spamhaus' blacklist.