Exchange -AD Design Recommendation

TankSupport 41 Reputation points

Hi All,

We have two domains. One production and one development.


Both have an Exchange environment and production has moved to 0365 and has an on-premise exchange server ( hybrid server)

I need to decommission this dev exchange environment.

How do I allow users to test applications using O365 or On-premise Exchange server?
They only required test the mail functionality.


Exchange Server Management
Exchange Server Management
Exchange Server: A family of Microsoft client/server messaging and collaboration software.Management: The act or process of organizing, handling, directing or controlling something.
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  1. Andy David - MVP 145.1K Reputation points MVP
    1. Add as an accepted domain to the on-prem Exchange Server:
    2. Add as a domain in 365:

    Set DNS records ( Mx / autodiscover tc.. ) to 365

    Create the necessary AD accounts on-prem to sync to 365. add as an allowed UPN:

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  2. Xzsssss 8,861 Reputation points Microsoft Vendor

    Hi @TankSupport ,

    May I ask what tests are you going to do? On-prem or Online?
    I'm a bit confused, if you only want to do some tests with mail function, why not creating a test account in the product server..?

    Or you could create a O365 account and sync with your AD accounts like Andy said: How to use SMTP matching to match on-premises user accounts to Office 365 user accounts for directory synchronization

    Sorry for these stupid questions, if you could please let know more about this issue, thanks..

    Best regards,

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  3. TankSupport 41 Reputation points

    Hi All,

    Thank you. This Dev environment is an internal-only AD domain for application testing. Simply test SMTP email functionality and login to the OWA and check these emails. ( On-prem only)