spf.ams.vectant.ad.jp has no MX records.
Question and response
Question
dig spf.ams.vectant.ad.jp. MX
Answer
The response has no answer records.
Authority
ams.vectant.ad.jp. 300 SOA nsmaster10.vectant.ne.jp. sysadmin.vectant.ad.jp. 2025011700 1800 900 604800 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0