mail.lavate.ch has no CNAME records.
Question and response
Question
dig mail.lavate.ch. NS
Answer
The response has no answer records.
Authority
lavate.ch. 1800 SOA buck.ns.cloudflare.com. dns.cloudflare.com. 2398235453 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0