Hi everyone I am using Exchange Server 2013 CU7, I am able to send and receive emails to other domains but on one domain i got complaint that they are not receive our emails but we are able to receive their emails. Please do guide me how to troubleshoot in Exchange 2013 as i am new this version of Exchange.
Subject: Delivery delayed
Delivery is delayed to these recipients or groups:test@otherdomain.com (test@otherdomain.com)
Subject: TEST
This message hasn't been delivered yet. Delivery will continue to be attempted.
The server will keep trying to deliver this message for the next 1 days, 19 hours and 51 minutes.
You'll be notified if the message can't be delivered by that time.
Diagnostic information for administrators:
Generating server: myserver.mydomain.com
test@otherdomain.com
Remote Server returned '400 4.4.7 Message delayed'