smtp3.emnuvens.com.br has no NS records.
NS records for this zone are defined at emnuvens.com.br.
NS records for this zone are defined at emnuvens.com.br.
Question and response
Question
dig smtp3.emnuvens.com.br. NS
Answer
The response has no answer records.
Authority
emnuvens.com.br. 1800 SOA fay.ns.cloudflare.com. dns.cloudflare.com. 2398780866 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0