ns1.brainerd.net has no MX records.
Question and response
Question
dig ns1.brainerd.net. MX
Answer
The response has no answer records.
Authority
brainerd.net. 60 SOA ns1.brainerd.net. hostmaster.brainerd.net. 2025021400 43200 3600 360000 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0