_spf.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 _spf.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