Block Local Addresses from External Sender Alltogether (DoNoSpoofing, default=score) is a nice option with posiblility of scanning From header. However if you run system where users can "park" (add) any domain to the you server (this) configuration it is possible that someone will add on purpose some exteral domain just to block senders at this domain from reaching mailboxes at your server... (thats why at MTA I run delivieres by dns rather than list of localdomains) It would be far better to check IP under first/any mx record at sender domain and compare it to list of your servers IPs (as specified by assp admin) and only do this blocking if this test fails... Of course this is additional dns traffic even if you use dns cacheing - assp might want to implement caching here on its own...
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