mx.truemail.it has no NS records.
NS records for this zone are defined at truemail.it.
NS records for this zone are defined at truemail.it.
Question and response
Question
dig mx.truemail.it. NS
Answer
The response has no answer records.
Authority
truemail.it. 21600 SOA dns.seeweb.it. hostmaster.seeweb.it. 2025091501 86400 7200 2592000 21600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0