mx.dynamail.ch has no NS records.
NS records for this zone are defined at dynamail.ch.
NS records for this zone are defined at dynamail.ch.
Question and response
Question
dig mx.dynamail.ch. NS
Answer
The response has no answer records.
Authority
dynamail.ch. 3600 SOA ns1.dynanet.ch. hostmaster.dynanet.ch. 2025105930 86400 3600 1209600 3600
Additional
. 0 OPT ; payload 1400, xrcode 0, version 0, flags 0