mx1.dialhost.com.br has no NS records.
NS records for this zone are defined at dialhost.com.br.
NS records for this zone are defined at dialhost.com.br.
Question and response
Question
dig mx1.dialhost.com.br. NS
Answer
The response has no answer records.
Authority
dialhost.com.br. 3600 SOA ns1.dialhost.com.br. alerta.dialhost.com.br. 2026022101 3600 600 2219200 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0