The sudden drop in activity of a major spam producer looks to be the result of the largest co-ordinated attack on spammers.
At 15:30 GMT on 16 March, a network of spam-producing computers, known as Rustock, suddenly stopped.
It also appears that the infrastructure needed to control the spam network has been disrupted.
Security researchers said that would make it the largest ever take down of a cyber crime network.
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www.bbc.co.uk/news/techn ··· 12772319