mx2.orangecyberdefense.com has no MX records.
Question and response
Question
dig mx2.orangecyberdefense.com. MX
Answer
The response has no answer records.
Authority
orangecyberdefense.com. 3600 SOA dns1.equant.net. dns\.operations.orange.com. 2021121432 1200 300 1209600 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0