Problem with mx

In can´t delete the enter Domaim-> Data-> in my own domain appear this message Error #459346986 Please contact supportMX Records can not be altered on subdomains.
My domain is

If your domain name is, you can configure MX records for MX records in the list which are not for the domain, do not affect the domain

The MX record for the “main domain” cannot be deleted, but will under no condition affect email delivery for your actual websites either.