smtp.decks.de has no NS records.
NS records for this zone are defined at decks.de.
NS records for this zone are defined at decks.de.
Question and response
Question
dig smtp.decks.de. NS
Answer
The response has no answer records.
Authority
decks.de. 3600 SOA ns1.first-ns.de. dns.hetzner.com. 2026021200 14400 1800 604800 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0