vmx.spamcop.net has no NS records.
NS records for this zone are defined at spamcop.net.
NS records for this zone are defined at spamcop.net.
Question and response
Question
dig vmx.spamcop.net. NS
Answer
The response has no answer records.
Authority
spamcop.net. 300 SOA ns1-93.akam.net. hostmaster.akamai.com. 2024060402 300 300 300 300
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0