ht.ok.shawcable.net has no MX records.
Question and response
Question
dig ht.ok.shawcable.net. MX
Answer
The response has no answer records.
Authority
ht.ok.shawcable.net. 600 SOA ns1.ht.ok.shawcable.net. dnsadmin.shaw.ca. 118 10800 3600 604800 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0