smtp2.entermail.it has no NS records.
NS records for this zone are defined at entermail.it.
NS records for this zone are defined at entermail.it.
Question and response
Question
dig smtp2.entermail.it. NS
Answer
The response has no answer records.
Authority
entermail.it. 86400 SOA dante.enter.it. hostmaster.enter.it. 2019112801 28800 7600 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0