Milter-greylist

Hello

It's a bit off-topic, but I know there are a bunch of mail system experts
on this list...

I'd like to fight better the image spams. The only solution I have heard 
about is the OCR plug-in for spamassassin. I don't want to run spamassassin
because it's too heavyweight. I'm looking for a way to convert the image 
into text and to run a regex filter on it.

Is there something lightweight and reliable that does that? If not I'm
going to develop it.

My idea would be to create a new milter that would perform OCR on images
contained in the message and would attach the obtained text at the end
of the message so that others tools (milter-regex for instance) could work 
on it. 

Any opinion on that approach?

-- 
Emmanuel Dreyfus
manu@...