mx.howtelevisionswork.com has no NS records.
NS records for this zone are defined at howtelevisionswork.com.
NS records for this zone are defined at howtelevisionswork.com.
Question and response
Question
dig mx.howtelevisionswork.com. NS
Answer
The response has no answer records.
Authority
howtelevisionswork.com. 3600 SOA dns.howtelevisionswork.com. hostmaster.howtelevisionswork.com. 1944844957 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0