mail.hiltonprincess.com has no CNAME records.
Question and response
Question
dig mail.hiltonprincess.com. NS
Answer
The response has no answer records.
Authority
hiltonprincess.com. 600 SOA ns59.domaincontrol.com. dns.jomax.net. 2025101800 28800 7200 604800 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0