mail.cascadeaccess.com has no CNAME records.
Question and response
Question
dig mail.cascadeaccess.com. NS
Answer
The response has no answer records.
Authority
cascadeaccess.com. 300 SOA ns1.scnresearch.com. hostmaster.ns1.scnresearch.com. 2025111201 21600 3600 1209600 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0