mx.lenminimal.com has no NS records.
NS records for this zone are defined at lenminimal.com.
NS records for this zone are defined at lenminimal.com.
Question and response
Question
dig mx.lenminimal.com. NS
Answer
The response has no answer records.
Authority
lenminimal.com. 3600 SOA dns.lenminimal.com. hostmaster.lenminimal.com. 1561122230 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0