The MX record means Mail eXchanger record. Specifies mail server, responsible for accepting e-mail messages.
The MX record has the following look in your ClouDNS Control Panel:
How to add it?
Go to your Control Panel and click on “Add new record”. Type, as follow:
TTL: 1 Hour
Priority: from 0 to 65535 (The priority of the target host, lower value means more preferred.).
Points to: theaddress.of.the.mailserver