Majority of spam sent by zombie PCs report finds

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Denver—MX Logic, an e-mail security company, said 56% of all spam was sent by so-called “zombie PCs” in July. It was the third consecutive month that zombie PCs accounted for more than half of spam, the company said. Spammers using zombie PCs “hijack” broadband PCs by installing a spam “Trojan” that provides them with remote spamming capabilities. In addition, MX Logic said that spam-sending domains are the biggest users of SPF and Sender ID, two authentication protocols developed to combat spam.
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