[Mimedefang] Image blocking idea

[David F. Skoll]

WBrown at e1b.org wrote:

> Here's an idea for blocking image spam:  What about taking the idea of 
> SURBL and DNSRBls and extending it to images.  My proposal is to hash the 
> image and do a DNS query using the hash value and domain hosting the image 
> RBL.

This is a good idea until spammers start mutating their images.

Regards,

David.