mail.smv.mil.do has no NS records.
NS records for this zone are defined at smv.mil.do.
NS records for this zone are defined at smv.mil.do.
Question and response
Question
dig mail.smv.mil.do. NS
Answer
The response has no answer records.
Authority
smv.mil.do. 1800 SOA aurora.ns.cloudflare.com. dns.cloudflare.com. 2396745684 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0