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Hello,<br />
<br />
I have the following scenarion:<br />
- Office 365 Exchange Online<br />
- Local Active Directory<br />
- Azure AD Sync<br />
- No local Exchange Server<br />
<br />
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.<br />
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?).<br />
<br />
Thanks for your support and best regards<br />
Thorsten
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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

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

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.