Spamassassin with the fuzzy ocr and imageinfo plug-ins have been catching most of the image spam hitting our mailservers. Then I noticed a flood of image spam getting through over the past few days. I noticed the images changed a little as I opened them, and when I examined them more closely, I saw that they were animated gifs. Since the first frame was blank, the fuzzy ocr had nothing to read. Luckily, with the imageinfo plug-in, I can filter by a spam’s pixel ratios, and I’m starting to filter the animated gifs in that manner.
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