mail.m247.ro has no CNAME records.
Question and response
Question
dig mail.m247.ro. NS
Answer
The response has no answer records.
Authority
m247.ro. 1800 SOA dorthy.ns.cloudflare.com. dns.cloudflare.com. 2397427220 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0