mx.newtonsofbury.com has no NS records.
NS records for this zone are defined at newtonsofbury.com.
NS records for this zone are defined at newtonsofbury.com.
Question and response
Question
dig mx.newtonsofbury.com. NS
Answer
The response has no answer records.
Authority
newtonsofbury.com. 3600 SOA dns.newtonsofbury.com. hostmaster.newtonsofbury.com. 1483702604 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0