ns3.socket.net has no MX records.
Question and response
Question
dig ns3.socket.net. MX
Answer
The response has no answer records.
Authority
socket.net. 3600 SOA ns1.socket.net. dns.socket.net. 2026022002 7200 7200 1209600 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0