Exchange 2013 - Queue stuck in retry - STMP relay to mailbox delivery group

How do I even tell what the next hop that its trying to connect to is?

Error seems to be "error encounted whilst trying to communicate with primary IP". How do I tell which IP it is trying to connect to?

Queue is growing :-(
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paulfoelAsked:
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R--RCommented:
Enable protocol logging to verbose on send connector analyse the log.
Also is the outgoing email are using smarthost or DNS?

you can refer article as below from MS

https://technet.microsoft.com/en-us/library/bb124531(v=exchg.150).aspx
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Clark KentSoftware Engineer cum BloggerCommented:
Hello,
The issue might be related to DNS. Please refer the following link. Similar problem has been solved in the query.

https://social.technet.microsoft.com/Forums/exchange/en-US/f3f547c0-66ec-4c27-9c4d-fcb6c749a3fb/emails-are-not-going-out-all-emails-stuck-in-queue-exchange-2013?forum=exchangesvrsecuremessaging
https://www.experts-exchange.com/questions/28220238/Exchange-2013-mail-flow-issues.html

Hopefully, this will help you solve the problem.

Thanks & Regards,
Clark Kent
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