Hi I recently changed an existing Distribution group to Only accept members from a specific Mail Universal Security Group named ABC that has been mail enabled.
One person who is in the ABC group gets the 550 5.7.1 RESOLVER.RST.NotAuthorized; not authorized message when trying to send to the distribution group. Other people who are in the group can send to the distribution list.
She is an internal user who has Outlook 2007. I am pretty sure the Accept messages from is configured right because we had people who cannot send to the list, we then put them in the appropriate ABC AD group listed on the Message Delivery Restrictions tab and they are able to send mail to the group.
I don't understand why it does not work for one person who is in the proper group. Please help