Criminal gangs using hijacked computers are behind a surge in unwanted e-mails peddling sex, drugs and stock tips.

The number of “spam” messages has tripled since June and now accounts for as many as nine out of 10 e-mails sent worldwide, according to U.S. email security company Postini.

As Christmas approaches, the daily trawl through in-boxes clogged with offers of fake Viagra, loans and sex aids is tipped to take even longer.

“E-mail systems are overloaded or melting down trying to keep up with all the spam,” said Dan Druker, a vice president at Postini.

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News source: CNN