To access the Domain Control Panel:
Sign in to your Business Control Panel.
Once signed in, you will see modules for each of your domain names on the Manage My Services page. Select the Domain Control Panel link that corresponds to the domain whose record you wish to configure MX Record for.
To set MX records:
Click the Manage Advanced DNS Settings link.
Click the Change MX Records button.
After selecting the Change MX Records button, enter mail1.redtailtechnology.com as the record value and you set a priority of 10, if you have an option.
To preserve the changes, click the Submit button.
You'll return to the Advanced DNS Settings page. The new entered MX record will appear in the MX records list.
Note: 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.