sctlemails3.sercomtel.com.br has no NS records.
NS records for this zone are defined at sercomtel.com.br.
NS records for this zone are defined at sercomtel.com.br.
Question and response
Question
dig sctlemails3.sercomtel.com.br. NS
Answer
The response has no answer records.
Authority
sercomtel.com.br. 3600 SOA ns1.skymail.net.br. hostmaster.sercomtel.com.br. 2026021803 7200 900 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0