Apex domains cannot have CNAME records.
Question and response
Question
dig redm.email. NS
Answer
redm.email. 5 NS ns-460.awsdns-57.com.
redm.email. 5 NS ns-1351.awsdns-40.org.
redm.email. 5 NS ns-631.awsdns-14.net.
redm.email. 5 NS ns-1889.awsdns-44.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0