I have received request to give a few users 'Send As' permissions for an important company mailbox. The sensitivity of the issue is, you cannot tell who sends email from that shared mailbox. In case of any issue, is there any way or any rule to determine who sent a particular email from that shared mailbox ? Can we retrieve the username ? I know we can do it by logging it to the Outlooks of all the users who have access to it and check their Sent Items or Deleted Items but is there any way I can check it on the server ?