I am writing an explanation regarding Send As and Send on behalf As permissions for my team. To add a few screenshots, I sent a few emails from some test accounts but all of them are coming as Send As even though I never gave myself permissions. I tried with a disabled user's email address and sent an email to my external gmail account and it went fine saying that the email came from the user himself. Is this default behavior for Exchange admins/domain admins ? Or do we have some loop holes here ?