mx.kievline.net has no CNAME records.
Question and response
Question
dig mx.kievline.net. NS
Answer
The response has no answer records.
Authority
kievline.net. 3600 SOA ns.kievline.net. hostmaster.kievline.net. 2026021400 14400 7200 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0