_spf.bahnhof.net has no CNAME records.
Question and response
Question
dig _spf.bahnhof.net. NS
Answer
The response has no answer records.
Authority
bahnhof.net. 300 SOA ns.bahnhof.se. hostmaster.bahnhof.net. 2026030608 1800 600 604800 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0