mail.negociebp2.com.br has no NS records.
NS records for this zone are defined at negociebp2.com.br.
NS records for this zone are defined at negociebp2.com.br.
Question and response
Question
dig mail.negociebp2.com.br. NS
Answer
The response has no answer records.
Authority
negociebp2.com.br. 1800 SOA kim.ns.cloudflare.com. dns.cloudflare.com. 2399268760 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0