mx.maderavintners.com has no CNAME records.
Question and response
Question
dig mx.maderavintners.com. NS
Answer
The response has no answer records.
Authority
maderavintners.com. 600 SOA ns43.domaincontrol.com. dns.jomax.net. 2026021276 28800 7200 604800 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0