mx.jk.locaweb.com.br has no NS records.
NS records for this zone are defined at jk.locaweb.com.br.
NS records for this zone are defined at jk.locaweb.com.br.
Question and response
Question
dig mx.jk.locaweb.com.br. NS
Answer
The response has no answer records.
Authority
jk.locaweb.com.br. 3600 SOA ns1.locaweb.com.br. hostmaster.locaweb.com.br. 2022260901 3600 600 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0