mxpool.epbfi.com has no CNAME records.
Question and response
Question
dig mxpool.epbfi.com. NS
Answer
The response has no answer records.
Authority
epbfi.com. 6959 SOA ns1.epbinternet.com. poc.epbinternet.com. 2026022001 10800 3600 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0