dns2.dion.ne.jp has no MX records.
Question and response
Question
dig dns2.dion.ne.jp. MX
Answer
The response has no answer records.
Authority
dion.ne.jp. 3600 SOA dns0.dion.ne.jp. ns-admin.dion.ne.jp. 2025092600 3600 1800 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0