Create two MX records with the priority of 10, and the hostname of "oxmail1.registrar-servers.com." for the first one and "oxmail2.registrar-servers.com." for the second one. (without the quotes, make sure you don't forget the trailing dot)
Create a CNAME record with the name of mail and the hostname of "oxwebmail.registrar-servers.com." (again without the quotes, make sure you don't forget the trailing dot)
Finally create a TXT record with the name of @ and the value of "v=spf1 include:ox.registrar-servers.com ~all" WITH the quotes.