smtp02.newworldtel.com has no CNAME records.
Question and response
Question
dig smtp02.newworldtel.com. NS
Answer
The response has no answer records.
Authority
newworldtel.com. 1800 SOA edna.ns.cloudflare.com. dns.cloudflare.com. 2398199640 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0