Exchange 2016 Mail Routing Question

Infinity Solutions
Infinity Solutions used Ask the Experts™
I have an exchange server that I need to forward a few mailboxes to the ISP and bypass the rules on the server itself that are looking for the domain name internally.  Can you help me understand how to do this for a few mailboxes that I don't have configured on the exchange server and need to go to my ISP pop mailboxes?  Thank you!
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IT Architect
Distinguished Expert 2017
Create isp contact first, then under mailbox properties, forward it to isp contact. check this KB:

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