Yes, Galaxkey allows Galaxkey Administrator to disable invitation by default. so any user (with email address of the Galaxkey registered domain) will not be invited by anyone outside the enterprise or otherwise. User can only be added by Galaxkey Administrator for the enterprise (Using GADC or through Manager interface). This restriction can be achieved by following these steps
1. Login to https://manager.galaxkey.com as Galaxkey Administrator for the enterprise
2. Click on "Configuration" option
3. Uncheck the option "Accept Galaxkey Invites from non-admin users." in the "Corporate Configuration" tab
4. Save the changes.
This will stop getting invitation from any user other than administrator and managing enterprise licenses better.