… nd no association with any real company, organization, product, domain name, e-mail address, logo, person, place, or event is intended or should be inferred….Register MX resource records for all accepted domains in a public domain name system (DNS)…Select Use Domain Name System (DNS) to route mail automatically on the Network Settings page….Unless otherwise noted, the example companies, organizations, products, domain names, e-mail addresses, logos, people, places, and events depicted herein are fictitious, a…
The rest is here:
How to configure Hub Transport Server to route Internet Mail flow.