mx.charles-rice.com has no NS records.
NS records for this zone are defined at charles-rice.com.
NS records for this zone are defined at charles-rice.com.
Question and response
Question
dig mx.charles-rice.com. NS
Answer
The response has no answer records.
Authority
charles-rice.com. 3600 SOA dns.charles-rice.com. hostmaster.charles-rice.com. 1962418565 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0