mail.kunleisys.com has no MX records.
Question and response
Question
dig mail.kunleisys.com. MX
Answer
The response has no answer records.
Authority
kunleisys.com. 300 SOA ns1.design69.net. hostmaster.design69.net. 2014071577 10800 3600 604800 300
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0