mail.cablelynx.com has no CNAME records.
Question and response
Question
dig mail.cablelynx.com. NS
Answer
The response has no answer records.
Authority
cablelynx.com. 3328 SOA auth1.america.net. dns.america.net. 2025120900 3600 600 864000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0