smtp.xdslnet.it has no NS records.
NS records for this zone are defined at xdslnet.it.
NS records for this zone are defined at xdslnet.it.
Question and response
Question
dig smtp.xdslnet.it. NS
Answer
The response has no answer records.
Authority
xdslnet.it. 300 SOA ns1.penteres.it. postmaster.penteres.it. 2026020509 43200 1800 2419200 300
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0