では、どうして以下のようになっているのでしょうか？

=========================================================

> 以下は、あなたへ送られた電子メールのヘッダー情報です。
>
> 送信者: postmaster@pc.117.cx
> 宛先: ○○@pc.117.cx
>
> ---
> MAILFROM: postmaster@pc.117.cx
> Received: from unknown (HELO mgw2.zenno.net) (192.168.0.33)
> by mail4.zenno.net with SMTP; 21 Jul 2004 09:33:33 +0900
> Received: (qmail 23128 invoked from network); 21 Jul 2004 09:29:44 +0900
> Received: from unknown (HELO pc.117.cx) (207.7.214.64)
> by mgw2.zenno.net with SMTP; 21 Jul 2004 09:29:44 +0900
> From: "Mail Administrator"
> To: ○○@pc.117.cx
> Subject: Returned mail: see transcript for details
> Date: Tue, 20 Jul 2004 19:25:30 -0500
> MIME-Version: 1.0
> Content-Type: multipart/mixed;
> boundary="----=_NextPart_000_0007_9EDA0AEB.690A8435"
> X-Priority: 3
> X-MSMail-Priority: Normal
> X-Mailer: Microsoft Outlook Express 6.00.2600.0000
> X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2600.0000

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