mx3.smartwisefun2.com has no CNAME records.
Question and response
Question
dig mx3.smartwisefun2.com. NS
Answer
The response has no answer records.
Authority
smartwisefun2.com. 876 SOA fay.ns.cloudflare.com. dns.cloudflare.com. 2396570462 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0