Use the 'BCC User' field when creating a new user on a client account to specify a user on your partner account who will receive copies of all emails sent by Dext Prepare to that client user.
Find the BCC User field when creating a new client user. Or by accessing the Manage menu and clicking on the Users tab.
Click on the Manage button on the right hand side of the screen and then on the Edit User Options on the drop down menu that appears.
Then select the BCC User drop down menu and select the user that you would like to receive all copies of emails.