infra.6level.net has no MX records.
Question and response
Question
dig infra.6level.net. MX
Answer
The response has no answer records.
Authority
infra.6level.net. 300 SOA ns1.6level.net. admin.6level.net. 2025121004 3600 300 2419200 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0