cgocable.com has no MX records.
Question and response
Question
dig cgocable.com. MX
Answer
The response has no answer records.
Authority
cgocable.com. 86400 SOA ns4.cgocable.net. dnsadmin.cgocable.net. 2007013490 28800 7200 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0