_spf.netatwork.de has no CNAME records.
Question and response
Question
dig _spf.netatwork.de. NS
Answer
The response has no answer records.
Authority
netatwork.de. 300 SOA dns200.anycast.me. tech.ovh.net. 2026021301 86400 3600 3600000 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0