dns6.m9.network has no MX records.
Question and response
Question
dig dns6.m9.network. MX
Answer
The response has no answer records.
Authority
m9.network. 600 SOA ns41.domaincontrol.com. dns.jomax.net. 2026020600 28800 7200 604800 600
Additional
. 0 OPT ; payload 1280, xrcode 0, version 0, flags 0