OK, here is a zone file we have opened up in notepad. Move the mouse over the different parts of the zone and look at the descriptions near the bottom of the page to get an explanation of what they do. In the example below for mydomain.com, email servers are mail.mydomain.com, mail2.mydomain.com and mail.anotherhost.com. It has host records for www.mydomain.com, router.mydomain.com (it points to a private IP, but that is OK and can be very useful for your own internal networks), proxy.mydomain.com, and several others including A records for the mail servers mail and mail2. This is typical of a zone file used by our DNS Services.