mx.sympatico.ca has no CNAME records.
Question and response
Question
dig mx.sympatico.ca. NS
Answer
The response has no answer records.
Authority
sympatico.ca. 900 SOA toroondcnszs01.srvr.bell.ca. dns-admin.bellglobal.com. 10003 10800 3600 2419200 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0