mjml-test.node.kunleisys.com has no CNAME records.
Question and response
Question
dig mjml-test.node.kunleisys.com. NS
Answer
The response has no answer records.
Authority
kunleisys.com. 130 SOA ns1.design69.net. hostmaster.design69.net. 2014071577 10800 3600 604800 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0