mx1.rockstable.it has no NS records.
NS records for this zone are defined at rockstable.it.
NS records for this zone are defined at rockstable.it.
Question and response
Question
dig mx1.rockstable.it. NS
Answer
The response has no answer records.
Authority
rockstable.it. 3600 SOA ns3.rockstable.org. hostmaster.rockstable.it. 2026012891 86400 3600 2419200 21600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0