Apex domains cannot have CNAME records.
Question and response
Question
dig creamailer.com. NS
Answer
creamailer.com. 3 NS ns2nsy.name.com.
creamailer.com. 3 NS ns3jwx.name.com.
creamailer.com. 3 NS ns4fpy.name.com.
creamailer.com. 3 NS ns1dhl.name.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0