smtpout.tmpw.com has no NS records.
NS records for this zone are defined at tmpw.com.
NS records for this zone are defined at tmpw.com.
Question and response
Question
dig smtpout.tmpw.com. NS
Answer
The response has no answer records.
Authority
tmpw.com. 3600 SOA dns1.p01.nsone.net. hostmaster.nsone.net. 1717667042 43200 7200 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0