Some users have requested to send as from a shared mailbox. I have created a shared mailbox, the user account linked to this is disabled. I have given the particular users full permissions and full send as permissions to this shared mailbox. The shared mailbox automapped to their outlook. Then tried to create a new email, then send FROM this shared mailbox but got a bounce back saying they didnt have the correct permissions.
exchange 2010, outlook 2010.