sbm.shawcable.net has no MX records.
Question and response
Question
dig sbm.shawcable.net. MX
Answer
The response has no answer records.
Authority
sbm.shawcable.net. 1800 SOA ns7.no.cg.shawcable.net. dnsadmin.shaw.ca. 2004020411 10800 1800 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0