ns.uranai.awk.jp has no MX records.
Question and response
Question
dig ns.uranai.awk.jp. MX
Answer
The response has no answer records.
Authority
uranai.awk.jp. 300 SOA ns.uranai.awk.jp. mikiandazuma.yahoo.co.jp. 1761950053 14400 60 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0