cwp.hostcolor.com has no MX records.
Question and response
Question
dig cwp.hostcolor.com. MX
Answer
The response has no answer records.
Authority
hostcolor.com. 1800 SOA ben.ns.cloudflare.com. dns.cloudflare.com. 2396079751 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0