mailserver.dirfsipag.com.br has no NS records.
NS records for this zone are defined at dirfsipag.com.br.
NS records for this zone are defined at dirfsipag.com.br.
Question and response
Question
dig mailserver.dirfsipag.com.br. NS
Answer
The response has no answer records.
Authority
dirfsipag.com.br. 1800 SOA kim.ns.cloudflare.com. dns.cloudflare.com. 2397105798 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0