mx.sharpdoodle.com has no NS records.
NS records for this zone are defined at sharpdoodle.com.
NS records for this zone are defined at sharpdoodle.com.
Question and response
Question
dig mx.sharpdoodle.com. NS
Answer
The response has no answer records.
Authority
sharpdoodle.com. 3600 SOA dns.sharpdoodle.com. hostmaster.sharpdoodle.com. 1697629594 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0