enmaiのプロフィール

Delivery to the following recipient failed permanently: 相手のアド Technical details of permanent failure: Google tried to deliver your message, but it was rejected by the recipient domain. We recommend contacting the other email provider for further information about the cause of this error. The error that the other server returned was: 550 550 Unknown user 相手のアド(state 18). ----- Original message ----- MIME-Version: 1.0 Received: by 10.68.225.164 with SMTP id rl4mr15119397pbc.117.1328091360961; Wed, 01 Feb 2012 02:16:00 -0800 (PST) Received: by 10.142.79.16 with HTTP; Wed, 1 Feb 2012 02:16:00 -0800 (PST) Date: Wed, 1 Feb 2012 19:16:00 +0900 Message-ID: <知らないアド> Subject: From: =?ISO-2022-JP?B?GyRCPy5AJU19OWEbKEI=?= <自分のアド> To: =?ISO-2022-JP?B?GyRCYzdGIxsoQiAbJEJCczMkGyhC?= <相手のアド> Content-Type: multipart/alternative; boundary=e89a8ff2518ecca40b04b7e45d40 （本文） ↑これはどういう事ですか？ 教えてください！！