mx.schweizer-internet.com has no NS records.
NS records for this zone are defined at schweizer-internet.com.
NS records for this zone are defined at schweizer-internet.com.
Question and response
Question
dig mx.schweizer-internet.com. NS
Answer
The response has no answer records.
Authority
schweizer-internet.com. 3600 SOA dns.schweizer-internet.com. hostmaster.schweizer-internet.com. 1275623520 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0