Postfix policy servers

Tom and everyone

I've just been reading about Postfix policy servers - seems to be a generic framework for providing access policy to a Postfix MTA given various parameters about the connection and the message being submitted. It works over a TCP or unix socket with a simple interface.

The page I was reading is at http://www.postfix.org/SMTPD_POLICY_README.html

I got there via a posting on SPAM-L about Postgrey, which is an implementation of greylisting in the framework described above. That implementation is described at http://isg.ee.ethz.ch/tools/postgrey/ - there's also an SPF policy engine apparently - haven't found that yet.

The framework looks interesting - particularly since you can run one engine and have it serve policy (and gather information) from multiple MTAs.

What chance of implementing a client for this framework in Exiscan? It would enable us to tap into an existing body of development. 

Peter