mail.datacloud.ro has no CNAME records.
Question and response
Question
dig mail.datacloud.ro. NS
Answer
The response has no answer records.
Authority
datacloud.ro. 1730 SOA curt.ns.cloudflare.com. dns.cloudflare.com. 2396815384 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0