Unable to assign send as permission on system mailbox
Hi, I'm setting up EV 10 with Exchange 2010. I created the EV service account and its mailbox as well as the EV system mailbox. When I run the Add-Adpermission -Identity <system mailbox> -User <domain\EV service account> -AccessRights ExtendedRight -ExtendedRights "send as" command, it comes back with "<system mailbox> wasn't found. Please make sure you've typed it in correctly". I tried entering the system mailbox's address several different ways, but no luck.