mail.fitx.ro has no NS records.
NS records for this zone are defined at fitx.ro.
NS records for this zone are defined at fitx.ro.
Question and response
Question
dig server2.fitx.ro. NS
Answer
The response has no answer records.
Authority
fitx.ro. 3600 SOA ns.fitx.ro. admin.fitx.ro. 2020072801 86400 3600 604800 10800
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0