mail.tvpost.ro has no CNAME records.
Question and response
Question
dig mail.tvpost.ro. NS
Answer
The response has no answer records.
Authority
tvpost.ro. 443 SOA ns1.tvpost.ro. hostmaster.tvpost.ro. 2026020209 3600 3600 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0