ns3.dnsdomene.net has no MX records.
Question and response
Question
dig ns3.dnsdomene.net. MX
Answer
The response has no answer records.
Authority
dnsdomene.net. 3600 SOA ns1.dnshost.net. zonemaster.dnshost.net. 1723715738 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1400, xrcode 0, version 0, flags 0