mx-variomailprotection.variomail.net has no CNAME records.
Question and response
Question
dig mx-variomailprotection.variomail.net. NS
Answer
The response has no answer records.
Authority
variomail.net. 1800 SOA ns0.ambisys.jp. hostmaster.ambisys.com. 2026011501 10800 1800 3600000 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0