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

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
Thorsten_SAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Vasil Michev (MVP)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
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
Thorsten_SAuthor Commented:
Great! Thanks a lot.
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Office 365

From novice to tech pro — start learning today.