What is the prescribed behavior for aliases of users that no longer exist.  In this case there is a ali alias but the original email is no longer in the settings.  Is that because the user doesn't exist?   Is there a way to maybe have an indicator that the alias may no longer be valid? Maybe make it red?  Or is the fact that it has no email address in the column marked Email addresses is 0 supposed to be used as the indication that the user no longer exists?  Anyway, my proposed idea is to maybe distinguish by color that the alias is defunct. Some of my domain users have a ton of aliases. Maybe a report and bulk ability to remove them?