mx.zonpralvin.com has no NS records.
NS records for this zone are defined at zonpralvin.com.
NS records for this zone are defined at zonpralvin.com.
Question and response
Question
dig mx.zonpralvin.com. NS
Answer
The response has no answer records.
Authority
zonpralvin.com. 3600 SOA dns.zonpralvin.com. hostmaster.zonpralvin.com. 1379494939 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0