mx21.jasmine.com has no MX records.
Question and response
Question
dig mx21.jasmine.com. MX
Answer
The response has no answer records.
Authority
jasmine.com. 1800 SOA brett.ns.cloudflare.com. dns.cloudflare.com. 2396647937 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0