I received such an real FromName-Spoofing E-Mail, replaced only data sensitive infos.
Received: from mail2.mydomain.com (localhost.localdomain [127.0.0.1])
by mail2.mydomain.com (Proxmox) with ESMTP id A96001214C7
for <myuseraccount@mydomain.com>; Mon, 14 Sep 2020 13:40:15 +0200...