110.ap.yournet.ne.jp has no MX records.
Question and response
Question
dig 110.ap.yournet.ne.jp. MX
Answer
The response has no answer records.
Authority
110.ap.yournet.ne.jp. 3600 SOA NS21.FreeBit.NET. root.FreeBit.NET. 2022030300 7200 1800 604800 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0