mx0.gtstelecom.ro has no CNAME records.
Question and response
Question
dig mx0.gtstelecom.ro. NS
Answer
The response has no answer records.
Authority
gtstelecom.ro. 227 SOA ns.gtstelecom.ro. hostmaster.gtstelecom.ro. 2025071101 1800 7200 1814400 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0