smtp.virtualtec.ch has no NS records.
NS records for this zone are defined at virtualtec.ch.
NS records for this zone are defined at virtualtec.ch.
Question and response
Question
dig smtp.virtualtec.ch. NS
Answer
The response has no answer records.
Authority
virtualtec.ch. 3600 SOA ns1.virtualtec.ch. hostmaster.virtualtec.ch. 2026020600 14400 3600 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0