Why doesn't DCC help against image spam?

Remco Barendse mailscanner at barendse.to
Sun Dec 24 16:43:40 CET 2006

Now that ORDB is down my mailscanner is not filtering any spam anymore, i 
might as well disable it.

But out of curiosity, why doesn't DCC work for the image spam?

A checksum should be reasonably effective against the image spam i think? 
Assuming that they are not dynamically building each picture a bit 
differently for each e-mail that is sent?

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