smtp-ae.cloudzy.com has no CNAME records.
Question and response
Question
dig smtp-ae.cloudzy.com. NS
Answer
The response has no answer records.
Authority
cloudzy.com. 428 SOA nash.ns.cloudflare.com. dns.cloudflare.com. 2397235285 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0