spamfilter.everyware.ch has no NS records.
NS records for this zone are defined at everyware.ch.
NS records for this zone are defined at everyware.ch.
Question and response
Question
dig spamfilter.everyware.ch. NS
Answer
The response has no answer records.
Authority
everyware.ch. 3600 SOA dns1.ewdns.ch. hostmaster.everyware.ch. 1773998233 86400 3600 1048576 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0