toppcrews.nttpc.co.jp has no MX records.
Question and response
Question
dig toppcrews.nttpc.co.jp. MX
Answer
The response has no answer records.
Authority
toppcrews.nttpc.co.jp. 300 SOA ns2.nttcom.ne.jp. root.nttcom.ne.jp. 2024101701 10800 1800 2419200 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0