mail006.fmknation.eu.com has no CNAME records.
Question and response
Question
dig mail006.fmknation.eu.com. NS
Answer
The response has no answer records.
Authority
fmknation.eu.com. 921 SOA alina.ns.cloudflare.com. dns.cloudflare.com. 2397067278 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0