mx0129.ppsmtp.de has no NS records.
NS records for this zone are defined at ppsmtp.de.
NS records for this zone are defined at ppsmtp.de.
Question and response
Question
dig mx0129.ppsmtp.de. NS
Answer
The response has no answer records.
Authority
ppsmtp.de. 1800 SOA ns1.p68.dns.oraclecloud.net. hostmaster.ppsmtp.de. 294 14400 1800 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0