spf.iway.ch has no CNAME records.
Question and response
Question
dig spf.iway.ch. NS
Answer
The response has no answer records.
Authority
iway.ch. 3600 SOA ns1.as8758.net. hostmaster.as8758.net. 2025071027 86400 7200 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0