itk6.static.cnode.jp has no MX records.
Question and response
Question
dig itk6.static.cnode.jp. MX
Answer
The response has no answer records.
Authority
itk6.static.cnode.jp. 3600 SOA a.conoha-dns.com. hostmaster.cnode.jp. 1706164934 3600 600 86400 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0