Please check your system for viruses, or ask your system administrator to do so.
For your reference, here are the SMTP envelope originator
From ------------------------- BEGIN HEADERS ----------------------------- Received: from easter.ne.jp (ZG160213.ppp.dion.ne.jp [222.2.160.213]) by postfix.fc2.com (Postfix) with ESMTP id 149C81916 for