smtp01.jetshop.io has no NS records.
NS records for this zone are defined at jetshop.io.
NS records for this zone are defined at jetshop.io.
Question and response
Question
dig smtp01.jetshop.io. NS
Answer
The response has no answer records.
Authority
jetshop.io. 300 SOA ns1-06.azure-dns.com. azuredns-hostmaster.microsoft.com. 1 3600 300 2419200 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0