spf.mcscloud.jp has no MX records.
Question and response
Question
dig spf.mcscloud.jp. MX
Answer
The response has no answer records.
Authority
mcscloud.jp. 360 SOA ns6-tk01.ocn.ad.jp. root.ocn.ad.jp. 2025111901 10800 3600 604800 360
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0