If you use the "Change e-mail address" function on a mailbox in ARM, you have the option to enter a new e-mail address as free text.
This allows mailadresses and maildomains to be created that are not configured on the Exchange server. This results in errors.
It would be better, if the supported mail domains of the mail server can be defined in ARM and can be selected by drop-down in the "Change e-mail address" function.
Only the part before the "@" character must then be freely configurable.
