mta1.bizmailsrvcs.net has no NS records.
NS records for this zone are defined at bizmailsrvcs.net.
NS records for this zone are defined at bizmailsrvcs.net.
Question and response
Question
dig mta1.bizmailsrvcs.net. NS
Answer
The response has no answer records.
Authority
bizmailsrvcs.net. 86400 SOA ns1.verizon.net. dns.verizon.com. 2010071501 86400 3600 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0