inet-hc.jp has no MX records.
Question and response
Question
dig inet-hc.jp. MX
Answer
The response has no answer records.
Authority
inet-hc.jp. 3600 SOA ns1.inetidc.jp. postmaster.inet.co.jp. 2025102901 3600 900 2419200 3600
Additional
. 0 OPT ; payload 1410, xrcode 0, version 0, flags 0