Hostname Based Black/White lists

[Marc Perkel]

Does SA support host name based black/white lists? I suppose to do it 
right you might have to pick a specific received line to get the host 
that sent you the email, do FCrDNS, and then do the lookup.

Is something like this available? I'm doing it in Exim on my system, but 
Exim has the host connection information.