smtp.allwest.net has no MX records.
Question and response
Question
dig smtp.allwest.net. MX
Answer
The response has no answer records.
Authority
allwest.net. 43200 SOA allwest2.allwest.net. hostmaster.allwest.net. 242 21600 3600 604800 43200
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0