mx.throughputforce.com has no NS records.
NS records for this zone are defined at throughputforce.com.
NS records for this zone are defined at throughputforce.com.
Question and response
Question
dig mx.throughputforce.com. NS
Answer
The response has no answer records.
Authority
throughputforce.com. 3600 SOA dns.throughputforce.com. hostmaster.throughputforce.com. 1592529435 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0