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This document explains
What is DNS?
DNS can be considered something similar to a phone book. When you move from one location to another, your name stays the same, but your phone number may change. In order to point your name to the new phone number, you must contact the telephone service provider so they assign you the new phone number and update all directory information to reflect you as pointing to this new phone number.
In this way, the IP number can be compared to a phone number: When someone calls http://www.example.com/, your ISP looks at the DNS server, and asks "how do I contact example.com?" The DNS server responds: "It can be found at 220.127.116.11". As the Internet understands it, this can be considered the phone number for the server, which houses the http://www.example.com web site.
The DNS records for your domain are kept on your hosting server in the place called DNS zone. When you register a domain by means of the control panel, all DNS records are automatically created for you, but in some rare cases you may need to add custom records to your DNS zone. An example would be when you want all email to be processed by an external mail server rather than by the built-in mail system. However, such user intervention requires knowledge of DNS configuration and clear understanding of what is to be done.
How Do I Create Custom DNS records?
To create a custom record to your DNS zone, do the following:
Adding Custom A Records
Normally, A records are used to map domain names and web server IP's.
If you have selected A record, the following page appears:
WARNING: Please pay attention to $ORIGIN when you add an A record.
Adding Custom MX Records
Custom MX records should be added when you want to use your external mail servers to process your e-mail. To use your external servers instead of those you get by default, you need to disable mail service on the Domain Settings page of your control panel. To use the default mail servers in addition to those you get by default, you need to keep mail service enabled in the control panel. The priority of the custom MX record will define whether your external servers will act as secondary or primary. For instance, if you set the priority of the custom MX record higher than 10 (e.g. 11), your external mail server will be used as secondary. If you set the priority of the custom MX record lower than 10 (e.g. 9), your external mail server will be used as primary. In the latter case, your mail will be sent to your external mail server until it goes down or becomes otherwise inaccessible. Then the default mail server will take over.
When you enable mail service in the control panel, an MX record is created automatically in the DNS zone. If mail service is disabled, this built-in MX record remains in the DNS zone, and you can remove it manually using the control panel interface.
If you have selected MX record, the following page appears:
IMPORTANT: To add an MX record for the base domain, leave the Name
Adding Custom CNAME Records
Finally, CNAME records are used to map aliases with domain names.
If you have selected CNAME record, the following page appears:
WARNING: Please pay attention to $ORIGIN when you add a CNAME record.