spf.nextron.ch has no CNAME records.
Question and response
Question
dig spf.nextron.ch. NS
Answer
The response has no answer records.
Authority
nextron.ch. 3600 SOA dns.nextron.ch. hostmaster.nextron.ch. 2026021002 10800 1800 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0