CentreStack is an on-premise enterprise file sync, share, and collaboration solution. It has a very rich enterprise feature set such as, allowing the admin to enable the feature 'Only Allow Sending Shares to Specified Domains'. For security reasons admins can restrict their team users from sharing any company's confidential data to any other users who belong to domains that are not approved by the IT admin. They will only be able to send shares to users that belong to the domains that are approved and configured in the feature by the admin.
The video below will demonstrates how admins can enable the setting 'Only Allow Sending Shares to Specified Domains' in Centrestack.