Apex domains cannot have CNAME records.
Question and response
Question
dig mail.UAR.Net. NS
Answer
mail.UAR.Net. 4 NS NS1.UAR.Net.
mail.UAR.Net. 4 NS NS2.UAR.Net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0