mail.cgi.ca has no CNAME records.
Question and response
Question
dig mail.cgi.ca. NS
Answer
The response has no answer records.
Authority
cgi.ca. 286 SOA ns.cgi.com. dnsops\.gto.cgi.com. 790473615 1200 180 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0