mx3.switch.ch has no CNAME records.
Question and response
Question
dig mx3.switch.ch. NS
Answer
The response has no answer records.
Authority
switch.ch. 180 SOA scsnms.switch.ch. dns-operation.switch.ch. 2026022202 900 600 604800 180
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0