Apex domains cannot have CNAME records.
Question and response
Question
dig binbox.email. NS
Answer
binbox.email. 5 NS ns2.pointerns.com.
binbox.email. 5 NS ns1.pointerns.com.
Authority
The response has no authority records.
Additional
ns1.pointerns.com. 5 A 185.31.158.130
ns2.pointerns.com. 5 A 185.90.58.167
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0