mx.mccarthy4boston.com has no NS records.
NS records for this zone are defined at mccarthy4boston.com.
NS records for this zone are defined at mccarthy4boston.com.
Question and response
Question
dig mx.mccarthy4boston.com. NS
Answer
The response has no answer records.
Authority
mccarthy4boston.com. 3600 SOA dns.mccarthy4boston.com. hostmaster.mccarthy4boston.com. 1681414331 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0