Forum Discussion
Can we restrict sending mail to O365 group mailbox to only group owners?
If that's what you want, Groups are not the feature you should be using. Sure, you can restrict sending via PowerShell and the corresponding parameters:
AcceptMessagesOnlyFrom
AcceptMessagesOnlyFromDLMembers
AcceptMessagesOnlyFromSendersOrMembers
RejectMessagesFrom
RejectMessagesFromDLMembers
RejectMessagesFromSendersOrMembers
RequireSenderAuthenticationEnabled
However, even if you apply this to members, they can still create items via OWA or Outlook, and perform any other operations.
VasilMichev I check the powershell commands here for https://docs.microsoft.com/en-us/powershell/module/exchange/users-and-groups/set-unifiedgroup?view=exchange-ps. . Is we have to individual email address in these command to accept message from owners. Is there setting where we can mention owners group and only they will able to send mail to group mailbox?
Nope.
VasilMichev Thank you for reply. Also I have one more query, suppose i restrict the group mailbox by adding email address of owners, Is there way I can revert back in future to its original settings(i.e to allow all members to send mail to group mailbox)?
You can just nullify the corresponding attributes.