cpgzone.com has no MX records.
Question and response
Question
dig cpgzone.com. MX
Answer
The response has no answer records.
Authority
cpgzone.com. 900 SOA mgoextdns1.genmills.com. dom\.admin.genmills.com. 19 10800 3600 2419200 900
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0