mail.wintec.com.ro has no CNAME records.
Question and response
Question
dig mail.wintec.com.ro. NS
Answer
The response has no answer records.
Authority
wintec.com.ro. 10800 SOA ns.luconsult.ro. mircea.luconsult.ro. 2022012600 10800 3600 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0