What Should My MX Records Be For Backup MX?

A domain with Backup MX should have the MX records shown below, your primary MX record that points at your mail server must have the lowest number (highest priority).  mail1.no-ip.com must also have a lower number than mail2.no-ip.com.


Host Priority
mail.domain.com 5
mail1.no-ip.com 10
mail2.no-ip.com 15