Spam, unsolicited commercial content spread at a mass scale, is everywhere on the Internet, in our email and on the sites we visit.1 At a minimum, spam is a nuisance, just another email or post online to delete or ignore. At its worst, falling victim to a spam attack risks infecting a system with malware or compromising an individual’s identity. This proliferation is due in large part to spambots, Internet robots designed to spread spam autonomously.

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