David Mehler:
> Hello,
> 
> I was hoping to avoid something so heavy weight, are there any other options?

As of Postfix 3.2, the policy delegation protocol will send the
server and client port and address. You can use this to query the
p0f cache.

http://www.postfix.org/SMTP_POLICY_README.html

This also has pointers to a simple policy daemon.

        Wietse

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