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Botnets appear to have suffered a big blow with the shutdown of Pricewert, resulting in the reduction of spam activities by 15 percent globally.
Spam made up more than 90 percent of all e-mail last month, with networks of zombie PCs producing the vast majority of such messages, MessageLabs says.
At the search giant's e-mail security unit, globally distributed automated systems and Zero-Hour software keep spam and viruses out of inboxes.
The Federal Trade Commission has Pricewert, an alleged rogue ISP, shut down by the U.S. District Court for the Northern District of California, San Jose Division.