mx.poki3.net has no CNAME records.
Question and response
Question
dig mx.poki3.net. NS
Answer
The response has no answer records.
Authority
poki3.net. 3564 SOA dns.poki3.net. hostmaster.poki3.net. 1823963102 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0