draco.securityboss.jp has no MX records.
Question and response
Question
dig draco.securityboss.jp. MX
Answer
The response has no answer records.
Authority
securityboss.jp. 1800 SOA garret.ns.cloudflare.com. dns.cloudflare.com. 2397359490 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0