A spammer's biggest trade off - making it through anti-spam filters doesn't mean the email receipt will even get the slightest chance of understanding what he's about to get scammed with."We have seen SPAM using ASCII ART in order to avoid being detected by antispam filters. Most of the times, they try to show different words (Viagra, etc.) using this technique, but this is the first time I have seen them showing a picture. It is not a very high quality one, but I’ve tried it with some different antispam filters and they have been fooled."
Here's an old school ASCII generator you can play around with, and a related image from a previous post on overperforming spammers.
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