mx.ftcz.net has no CNAME records.
Question and response
Question
dig mx.ftcz.net. NS
Answer
The response has no answer records.
Authority
ftcz.net. 1145 SOA ns.forpsi.net. admin.forpsi.com. 2026021101 14400 3600 2592000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0