Ruleset to lock domain to IP address

Brian Parish bmp at
Wed Oct 25 01:56:44 IST 2006

We plan to introduce some premium filtering options for some domains. 
This will result in all incoming mail to a given domain arriving from a
single known IP address.  To prevent "back-dooring" we'd like to lock
that in so any incoming mail to a given domain from any other IP address
is rejected or dropped.  Can I create a ruleset to achieve that?


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