mail.itns.email has no CNAME records.
Question and response
Question
dig mail.itns.email. NS
Answer
The response has no answer records.
Authority
itns.email. 40 SOA ns05.domaincontrol.com. dns.jomax.net. 2026012200 28800 7200 604800 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0