Mail Service and the Internet: DNS
If you want your e-mail server to send and receive mail over the Internet, you will need an Internet domain name (which ends in .com, .org, .net, or others) and DNS service.
You can buy a domain name at a domain name registrar such as
www.godaddy.com. If you own a domain name for a website, you can use it for e-mail as well. If you set up your server with a
.private domain name, you’ll need to reconfigure it with an Internet domain. You change the host name in the Network tab of the Server app’s server pane. If you change the host name, you must change any DNS settings that you may have for the server.
DNS service can run on your Mountain Lion Server Mac, on another server in your organization, or elsewhere, such as at your ISP or at the Internet registrar where you obtained your domain name.
Regardless of where you host your DNS service, you will need to create a ...