mail.ppsmtp.net has no NS records.
NS records for this zone are defined at ppsmtp.net.
NS records for this zone are defined at ppsmtp.net.
Question and response
Question
dig mail.ppsmtp.net. NS
Answer
The response has no answer records.
Authority
ppsmtp.net. 1800 SOA ns1.p68.dns.oraclecloud.net. hostmaster.ppsmtp.net. 490 3600 600 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0