Forum Discussion

Copper Contributor

Jun 26, 2019

Can we restrict sending mail to O365 group mailbox to only group owners?

We want only group owners should able to send email to respective O365 group mailbox. Other members of the group can only read the mails.

Office 365 Groups

VasilMichev

MVP

Jun 26, 2019

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.

Pawan_Satope

Copper Contributor

Jun 27, 2019

VasilMichev : Thanks for the reply. We have O365 groups where in some of the groups more than 100 members are there, hence we want to restrict it to only owners to send message to group mailbox. Also this groups are getting used in other communication sites and team sites as well for security and permission.

I will check the power shell command provided by you and let you know if any doubt.