v3.wpxhosting.com has no MX records.
Question and response
Question
dig v3.wpxhosting.com. MX
Answer
The response has no answer records.
Authority
v3.wpxhosting.com. 38400 SOA ns1.wpx.net. root.v11.wpxhosting.com. 1477051097 10800 3600 604800 38400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0