Milter-greylist

According to manu@...:
> 
> > > While I'm here, I'd like to seek comments on the following ACL, which is
> > > designed to fight image spam:
> > > dacl blacklist body /src[:blank:]*=(3D)?[:blank:]*["']?[:blank:]*cid:/ \
> > >         msg "HTML messages with embedded images are now refused"
> > 
> > not usable for me. That matches at least a third of my business emails,
> > including customers and suppliers.
> > All seems to be company enforced sigs with logos and links.
> 
> And the images are embedded in the mail and referenced with a cid: URL?

Correct. Such a regexp could only lead to tons of false positive.

What you can do is to feed all emails matching this to 'gocr' then check
the result against a list of words..
That may not be enough as direct ocr is still too weak (animated gifs,
transcoding, and stuff..). Add that and you obtain FuzzyOcr.

/Fabien