mx2.mail.hostpoint.ch has no CNAME records.
Question and response
Question
dig mx2.mail.hostpoint.ch. NS
Answer
The response has no answer records.
Authority
mail.hostpoint.ch. 278 SOA ns.hostpoint.ch. hostmaster.hostpoint.ch. 1771459200 14400 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0