smtp.design69.net has no CNAME records.
Question and response
Question
dig smtp.design69.net. NS
Answer
The response has no answer records.
Authority
design69.net. 3577 SOA ns1.design69.net. dns.design69.net. 2017060136 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0