dns2.cnci.jp has no MX records.
Question and response
Question
dig dns2.cnci.jp. MX
Answer
The response has no answer records.
Authority
cnci.jp. 300 SOA dns1.cnci.jp. root.dns1.cnci.jp. 2026021901 10800 900 604800 1200
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0