cv.gv.shawcable.net has no MX records.
Question and response
Question
dig cv.gv.shawcable.net. MX
Answer
The response has no answer records.
Authority
cv.gv.shawcable.net. 600 SOA ns1.cv.gv.shawcable.net. dnsadmin.shaw.ca. 134 10800 3600 604800 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0