mx.redrockcheck.com has no NS records.
NS records for this zone are defined at redrockcheck.com.
NS records for this zone are defined at redrockcheck.com.
Question and response
Question
dig mx.redrockcheck.com. NS
Answer
The response has no answer records.
Authority
redrockcheck.com. 3600 SOA dns.redrockcheck.com. hostmaster.redrockcheck.com. 1850014495 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0