smtpmailer02.ains.com has no NS records.
NS records for this zone are defined at ains.com.
NS records for this zone are defined at ains.com.
Question and response
Question
dig smtpmailer02.ains.com. NS
Answer
The response has no answer records.
Authority
ains.com. 900 SOA ns-1180.awsdns-19.org. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0