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ERROR: The action 'Set-DistributionGroup', 'AcceptMessagesOnlyFromSendersOrMembers', can't be perfor
error in setting sending restriction to distribution group The action 'Set-DistributionGroup', 'AcceptMessagesOnlyFromSendersOrMembers', can't be performed on the object 'ContosoALL' because the ...
VasilMichev Thanks!!
This resolved my issue. Once I added one member using PowerShell (running as domain administrator) on my domain controller, I was able to edit it using the regular ADSI edit tool.
Steve_Bauman will this block internal users from emailing the DG?
Yes I believe so. You can test it yourself by creating a test distribution group, setting this property, allowing it to synchronize to Office 365, then sending an email to it.
Unfortunately, deployment of this was halted internally for the company I work for, so I can't tell you for sure.
Thank you! Steve_Bauman