alert.inetidc.jp has no MX records.
Question and response
Question
dig alert.inetidc.jp. MX
Answer
The response has no answer records.
Authority
inetidc.jp. 3600 SOA ns1.inetidc.jp. root.inet.co.jp. 2026020601 3600 900 86400 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0