mx.benderjob.net has no NS records.
NS records for this zone are defined at benderjob.net.
NS records for this zone are defined at benderjob.net.
Question and response
Question
dig mx.benderjob.net. NS
Answer
The response has no answer records.
Authority
benderjob.net. 3600 SOA dns.benderjob.net. hostmaster.benderjob.net. 1764889896 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0