ns.technowave.ne.jp has no MX records.
Question and response
Question
dig ns.technowave.ne.jp. MX
Answer
The response has no answer records.
Authority
technowave.ne.jp. 300 SOA name.technowave.ad.jp. bind-admin.technowave.ad.jp. 2017010795 10800 3600 604800 1200
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0