mail.ns4.ezpublishing.com has no NS records.
NS records for this zone are defined at ns4.ezpublishing.com.
NS records for this zone are defined at ns4.ezpublishing.com.
Question and response
Question
dig mail.ns4.ezpublishing.com. NS
Answer
The response has no answer records.
Authority
ns4.ezpublishing.com. 600 SOA ns.ezpublishing.com. hostmaster.ezpublishing.com. 2018080800 3600 3600 3600000 7200
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0