Apex domains cannot have CNAME records.
Question and response
Question
dig mailee.me. NS
Answer
mailee.me. 5 NS ns-1351.awsdns-40.org.
mailee.me. 5 NS ns-413.awsdns-51.com.
mailee.me. 5 NS ns-661.awsdns-18.net.
mailee.me. 5 NS ns-1557.awsdns-02.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0