mail.89grad.ch has no CNAME records.
Question and response
Question
dig mail.89grad.ch. NS
Answer
The response has no answer records.
Authority
89grad.ch. 3600 SOA dns00.89grad.ch. admin.89grad.ch. 2026022601 3600 900 2419200 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0