mail.niatro.com has no NS records.
NS records for this zone are defined at niatro.com.
NS records for this zone are defined at niatro.com.
Question and response
Question
dig mail.niatro.com. NS
Answer
The response has no answer records.
Authority
niatro.com. 86400 SOA ns382.hostgator.com.br. root.br382.hostgator.com.br. 2026031800 86400 7200 3600000 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0