mx.mikrocenter.com.br has no NS records.
NS records for this zone are defined at mikrocenter.com.br.
NS records for this zone are defined at mikrocenter.com.br.
Question and response
Question
dig mx.mikrocenter.com.br. NS
Answer
The response has no answer records.
Authority
mikrocenter.com.br. 86400 SOA ns1.rr64.com.br. suporte.rr64.net. 2025030701 3600 1800 2419200 86400
Additional
. 0 OPT ; payload 1680, xrcode 0, version 0, flags 0