mail.commercial.cgocable.net has no MX records.
Question and response
Question
dig mail.commercial.cgocable.net. MX
Answer
The response has no answer records.
Authority
commercial.cgocable.net. 86400 SOA ns4.cgocable.net. dnsadmin.cgocable.net. 2007228576 10800 3600 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0