mx.wwaarchive.com has no NS records.
NS records for this zone are defined at wwaarchive.com.
NS records for this zone are defined at wwaarchive.com.
Question and response
Question
dig mx.wwaarchive.com. NS
Answer
The response has no answer records.
Authority
wwaarchive.com. 3600 SOA dns.wwaarchive.com. hostmaster.wwaarchive.com. 1472491435 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0