So as I was digging around the admin panel on my server. I went under System > and external dns and I was reading the page about what to do if i want to setup external dns servers for my mail server. As i was reading the page, i saw some references to some text files (highlighted in the picture below). When i first configured my Mail-in-a-Box server I set up the server as the primary and secondary name server per the installation instructions. When i setup a Mail-in-a-Box server does it come with the hightlighted text files in the picture or do i have to set all that up myself?