os-ping-alert.ucom.ne.jp has no MX records.
Question and response
Question
dig os-ping-alert.ucom.ne.jp. MX
Answer
The response has no answer records.
Authority
ucom.ne.jp. 60 SOA ns03.usen.ad.jp. root.ns03.usen.ad.jp. 2026020501 10800 360 86400 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0