Apex domains cannot have CNAME records.
Question and response
Question
dig nedm.email. NS
Answer
nedm.email. 5 NS ns-874.awsdns-45.net.
nedm.email. 5 NS ns-1585.awsdns-06.co.uk.
nedm.email. 5 NS ns-200.awsdns-25.com.
nedm.email. 5 NS ns-1066.awsdns-05.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0