ha0.enflow.network has no MX records.
Question and response
Question
dig ha0.enflow.network. MX
Answer
The response has no answer records.
Authority
enflow.network. 300 SOA ns1.enflow.nl. hostmaster.enflow.nl. 1644501146 10800 3600 604800 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0