mail20.lwspanel.com has no CNAME records.
Question and response
Question
dig mail20.lwspanel.com. NS
Answer
The response has no answer records.
Authority
lwspanel.com. 2560 SOA ns1.lws-hosting.net. hostmaster.lwspanel.com. 1772147401 25200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0