Apex domains cannot have CNAME records.
Question and response
Question
dig n-email.net. NS
Answer
n-email.net. 5 NS ns-1526.awsdns-62.org.
n-email.net. 5 NS ns-328.awsdns-41.com.
n-email.net. 5 NS ns-932.awsdns-52.net.
n-email.net. 5 NS ns-1723.awsdns-23.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0