mx.sleepapneacoach.com has no NS records.
NS records for this zone are defined at sleepapneacoach.com.
NS records for this zone are defined at sleepapneacoach.com.
Question and response
Question
dig mx.sleepapneacoach.com. NS
Answer
The response has no answer records.
Authority
sleepapneacoach.com. 3600 SOA dns.sleepapneacoach.com. hostmaster.sleepapneacoach.com. 1949117550 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0