mx.ovh.ca has no CNAME records.
Question and response
Question
dig mx.ovh.ca. NS
Answer
The response has no answer records.
Authority
ovh.ca. 300 SOA dns19.ovh.net. tech.ovh.net. 2026022000 3600 3600 3600000 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0