mx2.kyivlink.com has no CNAME records.
Question and response
Question
dig mx2.kyivlink.com. NS
Answer
The response has no answer records.
Authority
kyivlink.com. 1689 SOA amalia.ns.cloudflare.com. dns.cloudflare.com. 2398294792 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0