smtp.avency.de has no NS records.
NS records for this zone are defined at avency.de.
NS records for this zone are defined at avency.de.
Question and response
Question
dig smtp.avency.de. NS
Answer
The response has no answer records.
Authority
avency.de. 600 SOA theopolis.avency.de. postmaster.theopolis.avency.de. 2026031245 28800 7200 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0