smtp-out.mailserver.it has no NS records.
NS records for this zone are defined at mailserver.it.
NS records for this zone are defined at mailserver.it.
Question and response
Question
dig smtp-out.mailserver.it. NS
Answer
The response has no answer records.
Authority
mailserver.it. 86400 SOA ns.kpnqwest.it. hostmaster.ns.kpnqwest.it. 2021100100 86400 7200 604800 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0