01.dnsv.jp has no MX records.
Question and response
Question
dig 01.dnsv.jp. MX
Answer
The response has no answer records.
Authority
dnsv.jp. 7200 SOA 01.dnsv.jp. hostmaster.dnsv.jp. 2025053001 3600 300 3600000 7200
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0