The Problem
The is a potential issue if you use Organizational Units
Conferences and Communities get added to the list
Upon opening the newly populated Global Mail List, we see that there is a problem. The list also includes conferences that belong to this group.
The reason
The reason for this is because the group "Staff" has been designated as an Organizational Unit and any conference or community that is created and published in the directory by any member of this group will also be added to this group.