Experience with DKIM signatures and DCC

> We are using Spamhaus' XBL, and are happy to pay for it.  What I'm
> looking for now is something that rates domain names by reputation.

At this point, there isn't one.

Take a peek at http://www.domain-assurance.org/, a little trade 
association where we're trying to set standards for domain based 
whitelists and rep systems.  We've got lots of interest but so far the 
implementation is pretty weak.

I agree with Vernon that in general reputation is pretty hard since the 
bad guys have an unlimited supply of new domains.  That's why it makes 
more sense to start with whitelists, since good guys tend to hold still.

R's,
John