gate.forward.smtp.iad3a.emailsrvr.com has no NS records.
NS records for this zone are defined at emailsrvr.com.
NS records for this zone are defined at emailsrvr.com.
Question and response
Question
dig gate.forward.smtp.iad3a.emailsrvr.com. NS
Answer
The response has no answer records.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0