mx1.computerfarm.ch has no CNAME records.
Question and response
Question
dig mx1.computerfarm.ch. NS
Answer
The response has no answer records.
Authority
computerfarm.ch. 4990 SOA postino.computerfarm.ch. postmaster.computerfarm.ch. 2026012601 10800 3600 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0