mx.pyromasse.com has no NS records.
NS records for this zone are defined at pyromasse.com.
NS records for this zone are defined at pyromasse.com.
Question and response
Question
dig mx.pyromasse.com. NS
Answer
The response has no answer records.
Authority
pyromasse.com. 3600 SOA dns.pyromasse.com. hostmaster.pyromasse.com. 1541632188 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0