spf.webwide.net has no CNAME records.
Question and response
Question
dig spf.webwide.net. NS
Answer
The response has no answer records.
Authority
webwide.net. 231 SOA ns1.domainit.de. hostmaster.domainit.de. 2023120510 14400 3600 604800 28800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0