mail.tvas.ro has no CNAME records.
Question and response
Question
dig mail.tvas.ro. NS
Answer
The response has no answer records.
Authority
tvas.ro. 2427 SOA ns1.tvas.ro. alex.netprotect.ro. 2022050201 7200 540 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0