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Thanks for the help Vasil. Your solution mixed with changing the DNS server fixed the issue
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Thanks for the help Vasil. Your solution mixed with changing the DNS server fixed the issue

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We have configured the Hybrid connector between our Office 365 location and Exchange 2010 server and this has completed without error.<br />
<br />
However if we e-mail an e-mail address that only exists in one location then we get an NDR from the other (e.g. e-mail address exists on a mailbox in Exchange 2010, we try e-mailing this from Office 365 mailbox and get an NDR from Office 365 that the address does not exist).<br />
<br />
If we set a domain to only exist in one location (e.g. the domain only exists in Exchange 2010) and configure this domain if Office 365 to be the 'Internal Relay' type then mail flow works as expected and this can be delivered.<br />
<br />
I believe that we are missing something with the Office 365 portal configuration to allow domains to be configured as the 'shared' type (there is no option for this on the 'accepted domains' tab).<br />
<br />
Any suggestions on what we might be missing would be greatly appreciated.
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We have configured the Hybrid connector between our Office 365 location and Exchange 2010 server and this has completed without error.

However if we e-mail an e-mail address that only exists in one location then we get an NDR from the other (e.g. e-mail address exists on a mailbox in Exchange 2010, we try e-mailing this from Office 365 mailbox and get an NDR from Office 365 that the address does not exist).

If we set a domain to only exist in one location (e.g. the domain only exists in Exchange 2010) and configure this domain if Office 365 to be the 'Internal Relay' type then mail flow works as expected and this can be delivered.

I believe that we are missing something with the Office 365 portal configuration to allow domains to be configured as the 'shared' type (there is no option for this on the 'accepted domains' tab).

Any suggestions on what we might be missing would be greatly appreciated.

Office 365 - Exchange 2010 Hybrid configuration mail flow issues

Office 365 is a group of software plus services subscriptions that provides productivity software and related services to its subscribers. Office 365 allows the use of Microsoft Office apps on Windows and OS X, provides storage space on Microsoft's cloud storage service OneDrive, and grants 60 Skype minutes per month. Office 365 includes e-mail and social networking services through hosted versions of Exchange Server, Skype for Business Server, SharePoint and Office Online, integration with Yammer, as well as access to the Office software. All of Office 365's components can be managed and configured through an online portal; users can be added manually, imported from a CSV file, or Office 365 can be set up for single sign-on with a local Active Directory using Active Directory Federation Services.

Microsoft 365

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.