Apex domains cannot have CNAME records.
Question and response
Question
dig ijetmail.com. NS
Answer
ijetmail.com. 4 NS ns-294.awsdns-36.com.
ijetmail.com. 4 NS ns-1030.awsdns-00.org.
ijetmail.com. 4 NS ns-761.awsdns-31.net.
ijetmail.com. 4 NS ns-1972.awsdns-54.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0