mx.selectedevent.com has no NS records.
NS records for this zone are defined at selectedevent.com.
NS records for this zone are defined at selectedevent.com.
Question and response
Question
dig mx.selectedevent.com. NS
Answer
The response has no answer records.
Authority
selectedevent.com. 3600 SOA dns.selectedevent.com. hostmaster.selectedevent.com. 1810235279 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0