It's a real poser.
Lots of real email contains images, so we can't block all messages with
images. The distribution method is by compromised bots, so the source IPs
are all over the place.
One possibility would be to do an OCR scan on anything with an image. Big
server resources would be required to do that online, so it would have to be
some sidetrack process.
It would be interesting to see whether anybody else comes up with anything.
PDF spam will be next, I think.
-Dave Doherty
Skywaves, Inc.
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