b16.mta01.sendsmaily.info has no NS records.
NS records for this zone are defined at sendsmaily.info.
NS records for this zone are defined at sendsmaily.info.
Question and response
Question
dig b16.mta01.sendsmaily.info. NS
Answer
The response has no answer records.
Authority
sendsmaily.info. 900 SOA ns-1624.awsdns-11.co.uk. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0