agony.clusterage.com has no MX records.
Question and response
Question
dig agony.clusterage.com. MX
Answer
The response has no answer records.
Authority
clusterage.com. 3600 SOA dns.clusterage.com. hostmaster.clusterage.com. 1442067790 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0