mx.2ruote.info has no NS records.
NS records for this zone are defined at 2ruote.info.
NS records for this zone are defined at 2ruote.info.
Question and response
Question
dig mx.2ruote.info. NS
Answer
The response has no answer records.
Authority
2ruote.info. 3600 SOA dns.2ruote.info. hostmaster.2ruote.info. 1489197585 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0