mx.gbmooneybooks.com has no NS records.
NS records for this zone are defined at gbmooneybooks.com.
NS records for this zone are defined at gbmooneybooks.com.
Question and response
Question
dig mx.gbmooneybooks.com. NS
Answer
The response has no answer records.
Authority
gbmooneybooks.com. 3600 SOA dns.gbmooneybooks.com. hostmaster.gbmooneybooks.com. 1925526218 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0