smtp.sixtema.it has no NS records.
NS records for this zone are defined at sixtema.it.
NS records for this zone are defined at sixtema.it.
Question and response
Question
dig smtp.sixtema.it. NS
Answer
The response has no answer records.
Authority
sixtema.it. 1800 SOA aiden.ns.cloudflare.com. dns.cloudflare.com. 2396737673 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0