mx01.pi-pe.co.jp has no MX records.
Question and response
Question
dig mx01.pi-pe.co.jp. MX
Answer
The response has no answer records.
Authority
pi-pe.co.jp. 300 SOA ns.pi-pe.co.jp. postmaster.pi-pe.co.jp. 2026021001 900 900 604800 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0