mx.willssport.net has no NS records.
NS records for this zone are defined at willssport.net.
NS records for this zone are defined at willssport.net.
Question and response
Question
dig mx.willssport.net. NS
Answer
The response has no answer records.
Authority
. 120 SOA undefined.localhost. support.localhost. 2020053101 7200 3600 1209600 120
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0