mail.mxthunder.com has no NS records.
NS records for this zone are defined at mxthunder.com.
NS records for this zone are defined at mxthunder.com.
Question and response
Question
dig mail.mxthunder.com. NS
Answer
The response has no answer records.
Authority
mxthunder.com. 172800 SOA ns.dnsbox.net. hostmaster.dnsbox.net. 2026021706 10000 3600 604800 172800
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0