[Mimedefang] Image blocking idea

[Kenneth Porter]

On Thursday, April 20, 2006 2:06 PM +0100 Paul Murphy <pjm at ousekjarr.org> 
wrote:

> Imagine an animated GIF file where the first frame says "Click here for",
> the second shows a V, the third an I, the fourth an A, then G, R and A -
> the brain can join the dots, but can any software?

In other words, an escalation of the original problem with HTML as email, 
that it can represent a message the eye can understand but simple filter 
software can't.

I'm beginning to favor the idea of challenge/response systems, but only for 
"rich" content (ie. anything not pure text/plain).