cns1.firstlight.net has no MX records.
Question and response
Question
dig cns1.firstlight.net. MX
Answer
The response has no answer records.
Authority
firstlight.net. 300 SOA cns1.firstlight.net. hostmaster.firstlight.net. 2026000004 900 450 2419200 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0