crusader.asahi-net.or.jp has no MX records.
Question and response
Question
dig crusader.asahi-net.or.jp. MX
Answer
The response has no answer records.
Authority
asahi-net.or.jp. 600 SOA dns1.asahi-net.or.jp. hostmaster.asahi-net.or.jp. 2026030504 3600 300 604800 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0