[Mimedefang] Enlisting registrars in fighting phishing and other scams

[WBrown at e1b.org]

> How is this different from an RBL? SpamAssassin already knows how to 
query 
> several RBL's, and admins can change the scoring to reflect their trust 
of 
> each RBL's quality.

Similar, but in some ways, more like the URIBLs, looking at the domain 
name, not IP address.  The criteria for inclusion is the quality of the 
registrar in enforcing terms prohibiting the use of a domain for illegal 
activities such as spam and phishing.