mail.trustedshops.com has no NS records.
NS records for this zone are defined at trustedshops.com.
NS records for this zone are defined at trustedshops.com.
Question and response
Question
dig mail.trustedshops.com. NS
Answer
The response has no answer records.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0