mx.marketingcompanys.com has no NS records.
NS records for this zone are defined at marketingcompanys.com.
NS records for this zone are defined at marketingcompanys.com.
Question and response
Question
dig mx.marketingcompanys.com. NS
Answer
The response has no answer records.
Authority
marketingcompanys.com. 3600 SOA dns.marketingcompanys.com. hostmaster.marketingcompanys.com. 1954283023 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0