mx.thescubaexchange.com has no NS records.
NS records for this zone are defined at thescubaexchange.com.
NS records for this zone are defined at thescubaexchange.com.
Question and response
Question
dig mx.thescubaexchange.com. NS
Answer
The response has no answer records.
Authority
thescubaexchange.com. 3600 SOA dns.thescubaexchange.com. hostmaster.thescubaexchange.com. 1899915386 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0