mx.doctrinemedias.com has no NS records.
NS records for this zone are defined at doctrinemedias.com.
NS records for this zone are defined at doctrinemedias.com.
Question and response
Question
dig mx.doctrinemedias.com. NS
Answer
The response has no answer records.
Authority
doctrinemedias.com. 3600 SOA dns.doctrinemedias.com. hostmaster.doctrinemedias.com. 1146617346 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0