mail.conectasul.com has no NS records.
NS records for this zone are defined at conectasul.com.
NS records for this zone are defined at conectasul.com.
Question and response
Question
dig mail.conectasul.com. NS
Answer
The response has no answer records.
Authority
conectasul.com. 1800 SOA john.ns.cloudflare.com. dns.cloudflare.com. 2395573567 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0