lunlun.ns.giantpanda.com has no MX records.
Question and response
Question
dig lunlun.ns.giantpanda.com. MX
Answer
The response has no answer records.
Authority
giantpanda.com. 1800 SOA stevie.ns.cloudflare.com. dns.cloudflare.com. 2398215528 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0