Email address format to external recipients


I hope someone can help with what I thought would be a simple issue. To give a little background, we have a hybrid environment - Exchange 2010 / Exchange 2013 / Exchange Online. At the moment, there are only test mailboxes on Exchange Online. When an email is sent out from an on-premises mailbox to an external recipient, it looks like the below showing the full email address with the domain name.

If I send an email out from an Exchange Online mailbox to an external recipient however, it only shows the display name (in this case Office365 Test) and not the full email address.

How can I set this so that on-premises mailboxes also just show the display name as Exchange Online does?

SimpleDisplayName is not enabled for any domain and is not even populated for the Exchange Online account.

Thanks in advance.
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AmitIT ArchitectCommented:
This is outlook end setting. Read this:
AlAuthor Commented:

Thanks for the comment but I don't think that's the solution. Also, what I'm trying to achieve is the opposite of what that article describes. Additionally, this happens when mail is received by OWA, GMail, any external client/service; not just Outlook. It shows the full email address, not the display name. An email sent from Exchange Online shows only this display name which is how I want it to be set. There's nothing at all that can be done server-side to achieve that?
AlAuthor Commented:
Any other suggestions anyone? Technet isn't proving too useful either...
AlAuthor Commented:
Fixed it myself. In Exchange 2010, under Hub Transport > Remote domains > Message Format tab, ensure "Display sender's name on messages" is checked.

display name.

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AlAuthor Commented:
Found solution through my own investigation.
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