When a Web hosting network reputedly responsibly for three-quarters of the world's spam, McColo, was taken down in November, many people assumed the bust would take a big bite out of the amount of spam circulating.

Indeed, spam plummeted 70 percent overnight, but now spam is bouncing back faster than you can hit delete on that Viagra discount offer in your in-box. No joke.

According to Google, whose Postini Message Security network sees spam from more than 2 billion business e-mail connections per day, spam levels are up by 156 percent since November 2008.

Worse still, total spam volumes will be back to pre-McColo levels within a few months once spammers find new outlets for their unsolicited messages, wrote Amanda Kleha of the Google Message Security Team.  

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