mail.infomaniak.com has no CNAME records.
Question and response
Question
dig mail.infomaniak.com. NS
Answer
The response has no answer records.
Authority
infomaniak.com. 60 SOA ns1.infomaniak.ch. hostmaster.infomaniak.ch. 2026030644 900 900 604800 60
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0