rev.cgocable.net has no MX records.
Question and response
Question
dig rev.cgocable.net. MX
Answer
The response has no answer records.
Authority
rev.cgocable.net. 86400 SOA maul.cogeco.net. vader.cogeco.net. 2026021201 1800 3600 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0