hn.shawcable.net has no MX records.
Question and response
Question
dig hn.shawcable.net. MX
Answer
The response has no answer records.
Authority
hn.shawcable.net. 600 SOA ns1.ar.ed.shawcable.net. dnsadmin.shaw.ca. 4705591 10800 3600 604800 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0