mx.erickrobert.com has no NS records.
NS records for this zone are defined at erickrobert.com.
NS records for this zone are defined at erickrobert.com.
Question and response
Question
dig mx.erickrobert.com. NS
Answer
The response has no answer records.
Authority
erickrobert.com. 3600 SOA dns.erickrobert.com. hostmaster.erickrobert.com. 1805529399 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0