_spf.d-documents.it has no CNAME records.
Question and response
Question
dig _spf.d-documents.it. NS
Answer
The response has no answer records.
Authority
d-documents.it. 553 SOA ns1.register.it. hostmaster.register.it. 2026021705 10800 3600 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0