corpmail3mx.argentina.com has no NS records.
NS records for this zone are defined at argentina.com.
NS records for this zone are defined at argentina.com.
Question and response
Question
dig corpmail3mx.argentina.com. NS
Answer
The response has no answer records.
Authority
argentina.com. 1800 SOA dara.ns.cloudflare.com. dns.cloudflare.com. 2398888527 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0