mx.jupoconnect.com has no NS records.
NS records for this zone are defined at jupoconnect.com.
NS records for this zone are defined at jupoconnect.com.
Question and response
Question
dig mx.jupoconnect.com. NS
Answer
The response has no answer records.
Authority
jupoconnect.com. 3600 SOA dns.jupoconnect.com. hostmaster.jupoconnect.com. 1221324228 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0