mx.inbound.vox.co.za has no NS records.
NS records for this zone are defined at vox.co.za.
NS records for this zone are defined at vox.co.za.
Question and response
Question
dig mx.inbound.vox.co.za. NS
Answer
The response has no answer records.
Authority
inbound.vox.co.za. 2496 SOA ns1.voxdns.co.za. hostmaster.voxdns.co.za. 1 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0