mail.nttdata.ro has no CNAME records.
Question and response
Question
dig mail.nttdata.ro. NS
Answer
The response has no answer records.
Authority
nttdata.ro. 2940 SOA dns1.cscdns.net. hostmaster.cscdns.net. 2024070327 28800 7200 604800 14400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0