mail.sellmax.com.br has no NS records.
NS records for this zone are defined at sellmax.com.br.
NS records for this zone are defined at sellmax.com.br.
Question and response
Question
dig mail.sellmax.com.br. NS
Answer
The response has no answer records.
Authority
sellmax.com.br. 900 SOA d.sec.dns.br. hostmaster.registro.br. 2026045000 86400 900 604800 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0