This is getting out of control these days.
There is an interesting article at LWN about Fighting image spam.
From the article:
A number of spammers have been evading filters like SpamAssassin (SA) recently by encoding their messages as images. SA already has a set of rules that are meant to combat image spam, but the more recent [...]

Linux mail server: How to fight image spam

Originally from nixCraft by nixcraft

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