mx.phillyfoos.com has no NS records.
NS records for this zone are defined at phillyfoos.com.
NS records for this zone are defined at phillyfoos.com.
Question and response
Question
dig mx.phillyfoos.com. NS
Answer
The response has no answer records.
Authority
phillyfoos.com. 3600 SOA dns.phillyfoos.com. hostmaster.phillyfoos.com. 1990214781 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0