Thursday likely marked the largest proliferation of e-mail virus attacks in more than a year, according to security company Postini.

Postini said that two variations of the Storm Worm virus, which originally spread across the Internet in January, have quickly driven global virus levels 60 times higher than their daily average. E-mail users should be on alert for messages with "love"-related subject lines and an executable attachment that would contain a Trojan virus, as well as messages with "Worm Alert!" subject lines that contained a .zip file full of malicious code.

Postini, which is based in San Carlos, Calif., says it processes more than 2 billion messages per day in order to compile its reports.

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Yep! Postini is catching tons of these emails in their system.