kmacpbx.chickenkiller.com has no MX records.
Question and response
Question
dig kmacpbx.chickenkiller.com. MX
Answer
The response has no answer records.
Authority
chickenkiller.com. 3600 SOA ns1.chickenkiller.com. dnsadmin.afraid.org. 2602211416 86400 7200 2419200 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0