mail.somostodosum.com.br has no NS records.
NS records for this zone are defined at somostodosum.com.br.
NS records for this zone are defined at somostodosum.com.br.
Question and response
Question
dig mail.somostodosum.com.br. NS
Answer
The response has no answer records.
Authority
somostodosum.com.br. 1800 SOA jacqueline.ns.cloudflare.com. dns.cloudflare.com. 2398832923 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0