Apex domains cannot have CNAME records.
Question and response
Question
dig expertsender.com. NS
Answer
expertsender.com. 3 NS pdns08.domaincontrol.com.
expertsender.com. 3 NS pdns07.domaincontrol.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0