My client has Exchange Online and Office 365 with on-premises AD server. They just realized that a distribution group is set in Exchange Online to only allow email from internal users. When I tried to turn that off, I get the message below.
The action 'Set-DistributionGroup', 'RequireSenderAuthenticationEnabled', can't be performed on the object 'Operations' because the object is being synchronized from your on-premises organization. This action should be performed on the object in your on-premises organization
Where in AD do I adjust this so the DL can receive external email? I assume it is in the ADSI edit tool, but I do not know which attribute.
Thanks!
Charlie
Plexus IT
Charlie O'Hearn http://www.plexus-it.com