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Image spam
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Image spam is an obfuscating method in which the text of the message is stored as a GIF or JPEG image and displayed in the email. This prevents text based spam filters from detecting and blocking spam messages. Image spam is currently used largely to advertise "pump and dump" stocks.
Often, image spam contains non-nonsensical, computer-generated text which simply annoys the reader. However, new technology in some programs try to read the images by attempting to find text in these images. They are not very accurate, and sometimes filter out innocent images of products like a box that has words on it.
However, it now seems that the image no longer contains clear text in a static image format, but are embedded in an animated GIF, or lines are added to the background to mislead any image OCR tools, similar to CAPTCHA
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