I've seen similar threads, but no solutions.
Exchange 2010 SP2 RU3
I grant a user Send-As permissions to a distribution group. I also granted myself Send-As on this distribution group, for testing.
When creating a message, I have to go through the long process of getting to the Global Address List, and selecting the distribution group. If I do it that way, the send works.
However, the next time I want to send-as this account, if I click the From button and choose the suggested name, which is the name I want to use, I get an NDR, saying that I can't send on behalf of the person I was sending the message To:.
Anyone know of a way to fix this?