http://voices.washingtonpost.com/securityfix/2008/11/major_source_of_online_scams_a.html
quote:
Major Source of Online Scams and Spams Knocked Offline
A U.S. based Web hosting firm that security experts say was responsible for facilitating more than 75 percent of the junk e-mail blasted out each day globally has been knocked offline following reports from Security Fix on evidence gathered about suspicious activity emanating from the network.
For the past four months, Security Fix has been gathering data from the security industry about McColo Corp., a San Jose, Calif., based Web hosting service whose client list experts say includes some of the most disreputable cyber-criminal gangs in business today.
On Monday, Security Fix contacted the Internet providers that manage more than 90 percent of the company's connection to the larger Internet, sending them information about badness at McColo as documented by the security industry.
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In order to "kill" 75% of the worlds SPAM you need to kill the SRIZBI, MEGA-D, RUSTOCK and PUSHDO spambots. To do that you will need to clean out all the pc's thats infected with the malware that these bots use to send SPAM. As a general piece of information SPAM is not send from one person via a singele ISP. 