mx.fiolino.net has no CNAME records.
Question and response
Question
dig mx.fiolino.net. NS
Answer
The response has no answer records.
Authority
fiolino.net. 1526 SOA oskar.fiolino.net. admin.killer.biz. 2023022701 21600 3600 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0