"Image-based spam is on the rise, filling up inboxes with photos of naked women and some extremely graphic language that traditional spam filters used to be able to catch.
Image-based spam, which is increasing at an alarming rate, is a tactic spammers use to elude spam-filtering software that analyzes messages of keywords. By embedding their marketing messages in attached, randomized .gif or .jpg image files instead of in plain text, many spammers manage to elude those filters. Image-based emails don't differ much from text-based spam and will often include pitches for prescription drugs and penny stocks in addition to pornographic material. "
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http://searchsmb.techtarget.com/originalContent/0,289142,sid44_gci1207517,00.html?track=NL-382&ad=560274USCA&asrc=EM_NNL_436132&uid=1461419
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