mx.cheapervoice.com has no NS records.
NS records for this zone are defined at cheapervoice.com.
NS records for this zone are defined at cheapervoice.com.
Question and response
Question
dig mx.cheapervoice.com. NS
Answer
The response has no answer records.
Authority
cheapervoice.com. 3600 SOA dns.cheapervoice.com. hostmaster.cheapervoice.com. 1984089059 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0