0.221.202.bf.2iij.net has no MX records.
Question and response
Question
dig 0.221.202.bf.2iij.net. MX
Answer
The response has no answer records.
Authority
0.221.202.bf.2iij.net. 900 SOA dns-b.iij.ad.jp. dns-managers.iij.ad.jp. 1677670604 3600 1800 3600000 900
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0