[Spambayes] Spam in Images

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    Bob> But Peter's point is that a picture of somebody's granddaughter
    Bob> won't be a GIF image; it will be a JPEG. Digital cameras don't use
    Bob> GIF, and hardly anybody else does either. Except spammers, who
    Bob> presumably care less about image quality than about file size.

Sure, but just like everything else, the spamminess of specific image types
is highly user-specific.  I dont have any granddaughters (yet, thank God),
so at best JPEGS are a wash.  GIFs and PNGs look spammy though:

    % spamcounts -r image/
    token,nspam,nham,spam prob
    content-type:image/gif,64,2,0.885801412431
    content-type:image/jpeg,3,1,0.5
    content-type:image/png,5,0,0.95871559633

Still, the image type is just one token.  Almost no matter how strongly
spammy it is, it's likely to be overwhelmed by whatever other tokens exist
in the message.

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