dsl.airstreamcomm.net has no MX records.
Question and response
Question
dig dsl.airstreamcomm.net. MX
Answer
The response has no answer records.
Authority
dsl.airstreamcomm.net. 300 SOA ns1.airstreamcomm.net. hostmaster.airstreamcomm.net. 2025112507 86400 14400 3600000 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0