Most spam comes from just six botnets
Six botnets are responsible for 85 per cent of all spam, according to an analysis by net security firm Marshal. The Srizbi botnet is reckoned to be the largest single source of spam - accounting for 39 per cent of junk mail messages – followed by the Rustock botnet, responsible for 21 per cent of the spam clogging up users' inboxes.
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