zoot.jp has no MX records.
Question and response
Question
dig zoot.jp. MX
Answer
The response has no answer records.
Authority
zoot.jp. 3600 SOA dns1.interlink.or.jp. root.dns1.interlink.or.jp. 7 86400 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0