Exchange Online (O365), local Active Directory  with Azure AD Sync but without Exchange onpremises

Thorsten_S
Thorsten_S used Ask the Experts™
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Hello,

I have the following scenarion:
- Office 365 Exchange Online
- Local Active Directory
- Azure AD Sync
- No local Exchange Server

There is a local Distribution Group created in AD UC (Active Directory Users and Computers) and was synced to Office 365. Now this Distribution Group must set to disallow incoming E-Mails from external Persons. Because this Group was synced form Azure AD Sync to Office 365 I am not able to set this configuration in Exchange Online.
How can I set this Option now? I don´t want to install an Exchange Server onpremises to achieve my goal. Can I set this Option in any other way in my local Active Directory (AD Attribut or something else?).

Thanks for your support and best regards
Thorsten
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Most Valuable Expert 2015
Distinguished Expert 2018
Commented:
You dont need to install Exchange server on-prem, you only need to extend the schema so that the corresponding Exchange-related attributes are added, which in turn will allow you to manage them from your on-prem AD and sync to O365.

Extending the schema is a very easy operation, all you need to do is donwload the Exchange install files and run setup.exe with the /prepareschema switch. It will not install anything, but as usual it's best to coordinate this with your AD admins and such.

Once you have extended the schema, you also need to update your dirsync/AADConnect to recognize the new attributes. I've made a short guide here: http://www.michev.info/Blog/Post/117
Thorsten_S

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Commented:
Great! Thanks a lot.

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