mx4.hostfactory.swiss has no CNAME records.
Question and response
Question
dig mx4.hostfactory.swiss. NS
Answer
The response has no answer records.
Authority
hostfactory.swiss. 3600 SOA ns01.hostfactory.ch. sales.hostfactory.ch. 2025121648 7200 7200 1209600 7200
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0