72-15-13-138.static.firstlight.net has no MX records.
Question and response
Question
dig 72-15-13-138.static.firstlight.net. MX
Answer
The response has no answer records.
Authority
static.firstlight.net. 7200 SOA cns1.firstlight.net. hostmaster.firstlight.net. 2024091312 14400 7200 3600000 7200
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0