Spam Challenge-Response system

[Jessie Morris]

I was wondering if there was any way that I could make my mail system respond 
to emails received with a link that says something to the effect of, "If you're 
a human, click here to be allowed." I've done some searching on Google, and 
haven't found a really good system. Ideas?

-- 

Jessie Morris


-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 197 bytes
Desc: This is a digitally signed message part.
Url : http://plug.org/pipermail/plug/attachments/20090409/142e1f0e/attachment.bin