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I have an Ex2013 CU 20. This machine works fine, but I want to mirgrate to Ex 2016. So I installed an Ex 2016 on a new Windows 2016.

Now there is a queue on the new server named "briefkasten". There are a few incoming mails in it an the state is repeat. "briefkasten" is a mailbox database on the Ex2013. Obviously the Ex2016 is trying to deliver Mails to a database on the ex2013 server.

There is a error message: 

 05.06.2018 12:22:23 - Server at briefkasten returned '451 4.4.0 DNS query failed. The error was: SMTPSEND.DNS.NonExistentDomain; nonexistent domain briefkasten -> DnsDomainDoesNotExist: InfoDomainNonexistent'

I guess Ex2016 is trying to resolve "briefkasten", but it is not a server!

How to fix this? Which information do you need?

user472744
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1 Answers1

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Well, I used a second DNS Server which did not know the internal domain. That was the problem.

user472783
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