extra new domain in Ex2010 gives sending error "Delivery to these recipients or groups is complete, but no delivery notification was sent by"

Hello, thank you for reading:

We have a well establish well working Exchange 2010 server on a domain and today we added a new extra domain NewDomain.com and set up several different AD accounts for the users. Created the mailboxes, appended manually the new SMTP addresses. Logged into OWA/Outlook and tried sending our first emails and we get
"Delivery to these recipients or groups is complete, but no delivery notification was sent by ..."
on all emails. We don't even use the Delivery Notification yet still get this.
Symptoms:
- some, no pattern, but not all, are delivered to their destination
- regardless of actual "Delivery Notification"
- all other AD email accounts on this server work fine, as they were before
- we did the same typical configuration to add any new domain for emails to the system: added the domain to the EMC for allowed domains, added several new AD accounts, created mailboxes, set the proper SMTP, done
- outgoing connector has no rules, all apply

This seems like a weird fluke with the Exchange system. But only on these NewDomain.com emails.
plexusdevAsked:
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Satya PathakConnect With a Mentor Lead Technical ConsultantCommented:
Go through the below KB will help you to resolve this issue .

http://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/Q_27647546.html
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Gareth GudgerCommented:
Can you try restarting the Transport Service? Or rebooting the server? Any errors in Event Viewer? Specifically the Application Log?

I assume this is configure for Multi-tenancy?
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dsnegi_25decCommented:
Please reboot hub transport server hope that will work
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plexusdevAuthor Commented:
This worked because once complete we realized it wasn't our system. This document helped us confidently tell the recipent's Admin's that the problem is on their end. It took them another 4 days but they did solve it eventually. Thanks!
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