mail.quadranet.com has no CNAME records.
Question and response
Question
dig mail.quadranet.com. NS
Answer
The response has no answer records.
Authority
quadranet.com. 1957 SOA ns1.quadranet.com. support.quadranet.com. 2025031808 3600 300 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0