mx02.infomaniak.ch has no CNAME records.
Question and response
Question
dig mx02.infomaniak.ch. NS
Answer
The response has no answer records.
Authority
infomaniak.ch. 6187 SOA ns1.infomaniak.ch. hostmaster.infomaniak.ch. 2026141777 10800 1200 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0