I have created and manage several different distribution groups for our company. One DG is for ALL users and is compiled from our Global Address List. Very few emails need to be broadcast to ALL users in our company at one time; so, I am the only person who now has the ability to use that DG. I want to add one more user who can use this DG to broadcast emails.
It's been 3 years since I set this so only one person (myself) could use this DG, but I've forgotten how I did it and can't seem to find a document that explains this procedure.