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There's no standard for these sorts of "email signatures" so there's no guaranteed way to detect them.
A common way to format such a message would be to put the message text as a text/html part
inside a maultipart/related part, with an image/jpeg part containing the image.
Normally attachments should be part of a multipart/mixed part, and should have a Content-Disposition
But many mailers play fast and loose with these rules, so you may have to experiment with some
heuristics to detect such signatures reliably.