mailserver.dirffirstdata.com.br has no NS records.
NS records for this zone are defined at dirffirstdata.com.br.
NS records for this zone are defined at dirffirstdata.com.br.
Question and response
Question
dig mailserver.dirffirstdata.com.br. NS
Answer
The response has no answer records.
Authority
dirffirstdata.com.br. 1800 SOA kim.ns.cloudflare.com. dns.cloudflare.com. 2396992722 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0