mx21.jasmine.com has no NS records.
NS records for this zone are defined at jasmine.com.
NS records for this zone are defined at jasmine.com.
Question and response
Question
dig mx21.jasmine.com. NS
Answer
The response has no answer records.
Authority
jasmine.com. 1800 SOA brett.ns.cloudflare.com. dns.cloudflare.com. 2397284650 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0