mx01.telium.net.br has no NS records.
NS records for this zone are defined at telium.net.br.
NS records for this zone are defined at telium.net.br.
Question and response
Question
dig mx01.telium.net.br. NS
Answer
The response has no answer records.
Authority
telium.net.br. 3600 SOA ns1.telium.com.br. suporte.telium.com.br. 2026022523 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1680, xrcode 0, version 0, flags 0