Here the administrator can insert the domains, for which the packages can be addressed to any recipient (e-mail), even though no user with such an e-mail exists yet. This is especially useful in case when the integration with remote users directory (Active Directory, ADFS) is enabled. The screen looks like this:
New domain can be inserted using the Add button above the list. The following dialog is then displayed:
After confirmation by the Save button, the new domain is inserted to the list.