Apex domains cannot have CNAME records.
Question and response
Question
dig send.ee. NS
Answer
send.ee. 5 NS ns1.send.ee.
send.ee. 5 NS ns2.send.ee.
Authority
The response has no authority records.
Additional
ns1.send.ee. 5 A 77.240.240.68
ns2.send.ee. 5 A 185.121.173.190
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0