In Exchange 2010 RBAC allows you to grant permissions to Helpdesk or Administrators in a very granular manner. There are built in groups that one can use for Helpdesk and Recipient Management that one can add User Support team to be able to manage permissions on a mailbox, create and delete mailbox, mail enable public folders, manage permissions on mailbox etc.
I used the built in groups to grant our user support team permissions that they required. All works fine but User Support was unable to see or grant send as permissions. When any of them right click a mailbox they don’t even see an option to view or change send as permissions. They do see an option for managing full mailbox permissions.
In Toolbox of EMC go to “Role Based Access Control (RBAC) User Editor”
Double click Recipient Management Role and in the Roles add “Active Directory Permissions” click on Save.