mx.smilevisiontv.com has no NS records.
NS records for this zone are defined at smilevisiontv.com.
NS records for this zone are defined at smilevisiontv.com.
Question and response
Question
dig mx.smilevisiontv.com. NS
Answer
The response has no answer records.
Authority
smilevisiontv.com. 3600 SOA dns.smilevisiontv.com. hostmaster.smilevisiontv.com. 1160622468 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0