mx.orthospine.info has no NS records.
NS records for this zone are defined at orthospine.info.
NS records for this zone are defined at orthospine.info.
Question and response
Question
dig mx.orthospine.info. NS
Answer
The response has no answer records.
Authority
orthospine.info. 3600 SOA dns.orthospine.info. hostmaster.orthospine.info. 1532413671 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0