mailserver.uniquepg.com.br has no NS records.
NS records for this zone are defined at com.br.
NS records for this zone are defined at com.br.
Question and response
Question
dig mailserver.uniquepg.com.br. NS
Answer
The response has no answer records.
Authority
com.br. 900 SOA a.dns.br. hostmaster.registro.br. 2026074172 1800 900 604800 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0