mx.joyceholms.com has no NS records.
NS records for this zone are defined at joyceholms.com.
NS records for this zone are defined at joyceholms.com.
Question and response
Question
dig mx.joyceholms.com. NS
Answer
The response has no answer records.
Authority
joyceholms.com. 3600 SOA dns.joyceholms.com. hostmaster.joyceholms.com. 1640962861 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0