smtp2.digiservers.com.br has no NS records.
NS records for this zone are defined at com.br.
NS records for this zone are defined at com.br.
Question and response
Question
dig smtp2.digiservers.com.br. NS
Answer
The response has no answer records.
Authority
com.br. 900 SOA a.dns.br. hostmaster.registro.br. 2026055116 1800 900 604800 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0