Apex domains cannot have CNAME records.
Question and response
Question
dig itns.email. NS
Answer
itns.email. 5 NS ns05.domaincontrol.com.
itns.email. 5 NS ns06.domaincontrol.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0