mail2.donotspam.de has no NS records.
NS records for this zone are defined at donotspam.de.
NS records for this zone are defined at donotspam.de.
Question and response
Question
dig mail2.donotspam.de. NS
Answer
The response has no answer records.
Authority
donotspam.de. 900 SOA ns-1288.awsdns-33.org. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0