mx.vorverstaerker.com has no NS records.
NS records for this zone are defined at vorverstaerker.com.
NS records for this zone are defined at vorverstaerker.com.
Question and response
Question
dig mx.vorverstaerker.com. NS
Answer
The response has no answer records.
Authority
vorverstaerker.com. 3600 SOA dns.vorverstaerker.com. hostmaster.vorverstaerker.com. 1635995714 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0