mx.cki.net has no MX records.
Question and response
Question
dig mx.cki.net. MX
Answer
The response has no answer records.
Authority
cki.net. 300 SOA dns.starpoint.net. hostmaster.starpoint.net. 2025111111 300 300 300 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0