mx.departagonia.com has no NS records.
NS records for this zone are defined at departagonia.com.
NS records for this zone are defined at departagonia.com.
Question and response
Question
dig mx.departagonia.com. NS
Answer
The response has no answer records.
Authority
departagonia.com. 3600 SOA dns.departagonia.com. hostmaster.departagonia.com. 1258544860 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0