You can set MX records from the Advanced DNS Settings area of the Domain Control Panel.
Important note: If you replace Yahoo!'s default MX records or create an additional MX record for your domain name zone files with a higher priority than the Yahoo! mail servers (in other words, a priority lower than 50), the email services provided in the plan you purchased will no longer function. All email addressed to your domain will be handled by the server you specify in the MX record.
To access the Domain Control Panel:
To set MX records:
You'll return to the "Advanced DNS Settings" page, and your new MX record will appear in the MX records list. While your changes will appear in the name servers within minutes, please be aware that it can take up to 72 hours for new records to propagate to all name servers on the Internet.
Tip: If you made a mistake and would like to restore the MX record for Yahoo! mail, click the "Reset to Defaults" button.