mail.spf.retelit.it has no NS records.
NS records for this zone are defined at retelit.it.
NS records for this zone are defined at retelit.it.
Question and response
Question
dig mail.spf.retelit.it. NS
Answer
The response has no answer records.
Authority
retelit.it. 1800 SOA danica.ns.cloudflare.com. dns.cloudflare.com. 2398111241 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0