gearheart-com.mx2.arsmtp.com has no NS records.
NS records for this zone are defined at mx2.arsmtp.com.
NS records for this zone are defined at mx2.arsmtp.com.
Question and response
Question
dig gearheart-com.mx2.arsmtp.com. NS
Answer
The response has no answer records.
Authority
mx2.arsmtp.com. 600 SOA mdns1.appriver.com. support.appriver.com. 11149630 900 600 604800 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0