smtpcmd06.ad.aruba.it has no NS records.
NS records for this zone are defined at ad.aruba.it.
NS records for this zone are defined at ad.aruba.it.
Question and response
Question
dig smtpcmd06.ad.aruba.it. NS
Answer
The response has no answer records.
Authority
ad.aruba.it. 3600 SOA dc1.ad.aruba.it. hostmaster. 5203678 900 600 86400 3600
Additional
. 0 OPT ; payload 4000, xrcode 0, version 0, flags 0