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The DNS name of the Exchange 2013 server is servername.abc.local I setup a Hybrid Environment with the Public domain xyz.nl The UPN suffix of the abc.local domain is xyz.nl and I updated al users. The MX record is pointing to the On-Premise Exchange server Everything works as far a I know except one thing. On-premises users aren't getting email messages from Office 365 users. The error message is: "Remote Server returned '550 5.4.310 DNS domain abc.local does not exist. How to solve this?

Alfred
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  • What's the "Generating server" that returned this error message? It would also help if you could add the `Received` headers of the original message attached. – Esa Jokinen May 18 '20 at 13:43

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Did you get any errors when running HCW?

What is the email address for on-premises users? And you also could check the settings of the hybrid outbound connector. You could check if it configured to route the message to xyz.nl.

Jayce
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