mx.prod.qlmail.ch has no NS records.
NS records for this zone are defined at prod.qlmail.ch.
NS records for this zone are defined at prod.qlmail.ch.
Question and response
Question
dig mx.prod.qlmail.ch. NS
Answer
The response has no answer records.
Authority
prod.qlmail.ch. 7200 SOA . admin.qlns.ch. 2025072102 10800 3600 604800 7200
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0