_spf.maildata.it has no NS records.
NS records for this zone are defined at maildata.it.
NS records for this zone are defined at maildata.it.
Question and response
Question
dig _spf.maildata.it. NS
Answer
The response has no answer records.
Authority
maildata.it. 10800 SOA ns1.mvmnet.com. tec.mvmnet.com. 2025042212 43200 3600 2419200 10800
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0