wp2.visual4.com has no MX records.
Question and response
Question
dig wp2.visual4.com. MX
Answer
The response has no answer records.
Authority
visual4.com. 600 SOA ns33.domaincontrol.com. dns.jomax.net. 2026011400 28800 7200 604800 600
Additional
. 0 OPT ; payload 1280, xrcode 0, version 0, flags 0