(mt) Media Temple servers are pre-configured with Autodiscover. The Autodiscover service makes it easier to configure email clients like Outlook 2011 and some mobile phones.
For your changes to be effective, you must have NS1.MEDIATEMPLE.NET and NS2.MEDIATEMPLE.NET designated as your nameservers with your registrar. See (mt) Media Temple's DNS/Nameserver information for more (mt) Media Temple nameserver details.
Create a subdomain autodiscover.example.com to point to your desired location.
For detailed instructions on how to create an additional record to your domain's DNS zone file, please see: Updating and adding records.