emailserver4.serverpoint.com has no CNAME records.
Question and response
Question
dig emailserver4.serverpoint.com. NS
Answer
The response has no answer records.
Authority
serverpoint.com. 1390 SOA ns1.serverpoint.com. dns.cloudflare.com. 2396157340 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0