mx.mainstreetbusinessconnections.com has no NS records.
NS records for this zone are defined at mainstreetbusinessconnections.com.
NS records for this zone are defined at mainstreetbusinessconnections.com.
Question and response
Question
dig mx.mainstreetbusinessconnections.com. NS
Answer
The response has no answer records.
Authority
mainstreetbusinessconnections.com. 3600 SOA dns.mainstreetbusinessconnections.com. hostmaster.mainstreetbusinessconnections.com. 1164418319 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0