ns4.gwi.net has no MX records.
Question and response
Question
dig ns4.gwi.net. MX
Answer
The response has no answer records.
Authority
gwi.net. 345600 SOA ns3.gwi.net. hostmaster.gwi.net. 2026020900 21600 3600 864000 345600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0