This server is operating under the delusion that it is «bizcloud-power.yni.ac.jp»
It is not, despite delusions otherwise:
220 ynu.ac.jp ESMTP Postfix
250-ynu.ac.jp
Just one of 10000 or more…
Received: from [143.198.137.97] ([143.198.137.97])
From: x Survey <webmaster@x<mailto:webmaster@x>>
To: x<mailto:x>
Subject: Survey Message
Date: 25 Jul 2021 x +0200