[Exim] how to reject email that doesnt come from a valid MX …

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Author: Hanasaki JiJi
Date:  
To: List - Exim
Subject: [Exim] how to reject email that doesnt come from a valid MX ?
Any way to block all email comeing from an IP that isnt in the MX list
of the sending doman?

Spent the last 2 hrs looking through the online docs.