mail.newcentralhost.com has no CNAME records.
Question and response
Question
dig mail.newcentralhost.com. NS
Answer
The response has no answer records.
Authority
newcentralhost.com. 842 SOA diana.ns.cloudflare.com. dns.cloudflare.com. 2396587607 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0