mx-pool1.epbfi.com has no NS records.
NS records for this zone are defined at epbfi.com.
NS records for this zone are defined at epbfi.com.
Question and response
Question
dig mx-pool1.epbfi.com. NS
Answer
The response has no answer records.
Authority
epbfi.com. 7200 SOA ns1.epbinternet.com. poc.epbinternet.com. 2026022001 10800 3600 604800 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0