mta1.pointermail.com.br has no NS records.
NS records for this zone are defined at pointermail.com.br.
NS records for this zone are defined at pointermail.com.br.
Question and response
Question
dig mta1.pointermail.com.br. NS
Answer
The response has no answer records.
Authority
pointermail.com.br. 900 SOA ns-502.awsdns-62.com. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0