_spf.smgw.it has no CNAME records.
Question and response
Question
dig _spf.smgw.it. NS
Answer
The response has no answer records.
Authority
smgw.it. 21 SOA ns1.itmnetx.com. do-not-reply.smgw.it. 2025122600 43200 7200 1209600 60
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0