mail.negociemais.com.br has no NS records.
NS records for this zone are defined at negociemais.com.br.
NS records for this zone are defined at negociemais.com.br.
Question and response
Question
dig mail.negociemais.com.br. NS
Answer
The response has no answer records.
Authority
negociemais.com.br. 1800 SOA kim.ns.cloudflare.com. dns.cloudflare.com. 2396289515 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0