spf.grfstudio.com has no CNAME records.
Question and response
Question
dig spf.grfstudio.com. NS
Answer
The response has no answer records.
Authority
grfstudio.com. 327 SOA ns1.register.it. hostmaster.register.it. 2026021301 10800 3600 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0