mail.hostfactory.ch has no CNAME records.
Question and response
Question
dig mail.hostfactory.ch. NS
Answer
The response has no answer records.
Authority
hostfactory.ch. 180 SOA ns1.hostfactory.ch. admin.hostfactory.ch. 2026911740 3600 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0