We have a new domain which added on Organisation --> Hub transport --> Accepted domain. New mail policy also created, so my new firstname.lastname@example.org e-mail adress generated as well.
Because this is for testing purposes for a while, i did'n set this new e-mail as primpary.
When write a new e-mail in outlook i type my new address as sender and try to send a test mail but get message:
You can not send a message to the user on his behalf, unless it has permission to do so. Make sure you give the correct name of the sender, or ask the necessary authorization. If the problem persists, contact Support.
I have admin rights, this is my e-mail.
Need help what i missed and what else may i set in exhchange.
Thank you Masters