mail.allwest.net has no CNAME records.
Question and response
Question
dig mail.allwest.net. NS
Answer
The response has no answer records.
Authority
allwest.net. 2871 SOA allwest1.allwest.net. hostmaster.allwest.net. 242 21600 3600 604800 43200
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0