Spammers have plenty of tools in their arsenals to bypass anti-spam software by incorporating their sales pitches into images rather than sending them as plain text. Anti-spam vendors fought back, developing signatures designed to detect specific image spam messages, but spammers have now come up with a new technique: they're using randomized images that appear identical to the human eye, yet appear to be entirely unique to most anti-spam software. There has been a significant increase in image spam recently, due in part to the problems anti-spam software is having in detecting the new method. It takes real diligence today to stop image spam.

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