mx1.comendosystems.com has no MX records.
Question and response
Question
dig mx1.comendosystems.com. MX
Answer
The response has no answer records.
Authority
mx1.comendosystems.com. 3600 SOA ns1.electric.net. dns.electric.net. 1453845397 10000 1800 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0