mail.hadcloud.com.br has no NS records.
NS records for this zone are defined at hadcloud.com.br.
NS records for this zone are defined at hadcloud.com.br.
Question and response
Question
dig mail.hadcloud.com.br. NS
Answer
The response has no answer records.
Authority
hadcloud.com.br. 1800 SOA candy.ns.cloudflare.com. dns.cloudflare.com. 2396858823 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0