1. You’ll see a permissions screen with several check mark boxes
  2. Under the “Entire Organization” column, uncheck all four checkboxes
  3. Under the “External” column, uncheck the “Contact owners” checkbox
  4. Scroll down and click the dropdown labeled “Who can join the group”. Select “Only invited users”.
  5. Toggle the “Allow members outside your organization” option. This is necessary to add the Mail Armor address in the following step.
  6. Click on the blue “Create Group” button

You don't have credit card details available. You will be redirected to update payment method page. Click OK to continue.