Spam originating from Google's Gmail domain doubled last month, indicating that spammers are still defeating the CAPTCHA , the distorted text used as a security test to thwart mass registration of e-mail accounts and other Web site abuse.
Gmail spam went from 1.3 percent of all spam e-mail to 2.6 percent in February, according to data released by e-mail security vendor MessageLabs on Monday.
The new statistics are another nail in the coffin for CAPTCHA, which stands for "completely automated public Turing test to tell computers and humans apart.
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