mail.myaccess.ca has no CNAME records.
Question and response
Question
dig mail.myaccess.ca. NS
Answer
The response has no answer records.
Authority
myaccess.ca. 3391 SOA dns1.accesscomm.ca. webmaster.accesscomm.ca. 2022121681 43200 1800 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0