mx.inbetable.com has no NS records.
NS records for this zone are defined at inbetable.com.
NS records for this zone are defined at inbetable.com.
Question and response
Question
dig mx.inbetable.com. NS
Answer
The response has no answer records.
Authority
inbetable.com. 3600 SOA dns.inbetable.com. hostmaster.inbetable.com. 1493525286 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0