Apex domains cannot have CNAME records.
Question and response
Question
dig keyyomail.com. NS
Answer
keyyomail.com. 5 NS ns-68-b.gandi.net.
keyyomail.com. 5 NS ns-25-a.gandi.net.
keyyomail.com. 5 NS ns-38-c.gandi.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0