mail.keyspecial.de has no NS records.
NS records for this zone are defined at keyspecial.de.
NS records for this zone are defined at keyspecial.de.
Question and response
Question
dig mail.keyspecial.de. NS
Answer
The response has no answer records.
Authority
keyspecial.de. 86400 SOA ns.keyspecial.de. hostmaster.ns.keyspecial.de. 2014031317 10800 3600 604800 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0