Hi,

First of all, apologies for something that is a little off topic.

There was some interest in this earlier and there seems to be some 
traction/complaints about what to do with images on this list - sorry 
for the delay in posting. Below is a link to a SpamAssassin Plugin for 
detect corrupt images and other common patterns.  You will need to make 
sure that this and Image::Info gets loaded into amavisd. Also don't 
forget to put this in your *.pre and put some scoring in your local.cf 
for eval:check_image_corruption(), eval:check_image_size(), and 
eval:check_image_ratio().

The link is:

ftp://ftp.its.caltech.edu/pub/jstewart/ImageCheck.pm

This module is the result of Spammers sending annoying corrupt. In 
addition, I put in some checks for common spam image size and highly 
compressed images. No complaints of false postives even using aggressive 
scoring of 5, 2.3 and 0.5 for the above tests (respectively).

Enjoy. Let me know if you have any questions.

---Jack Stewart

-- 
Jack Stewart
626-395-4690 office
[EMAIL PROTECTED] / www.imss.caltech.edu

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