mx1.mail.ovh.ca has no CNAME records.
Question and response
Question
dig mx1.mail.ovh.ca. NS
Answer
The response has no answer records.
Authority
mail.ovh.ca. 60 SOA dns19.ovh.net. tech.ovh.net. 2026030200 86400 3600 3600000 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0