Email vacío y sin remitente

Me realizaron un formulario web y ahora todas las respuestas que recibo desde este formulario, me vienen con las casillas vacías y sin remitente.
Esta es la información que me consta en la pestaña “propiedades”
¿Cómo puedo saber quien es el remitente para darle respuesta?
Delivered-To: jjjjj @gmail.com
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Sat, 18 May 2013 21:13:31 -0700 (PDT)
X-Received: by 10.194.133.34 with SMTP id oz2mr7817724wjb.6.1368936810943;
Sat, 18 May 2013 21:13:30 -0700 (PDT)
Return-Path: <[email protected]>
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for <jjjjj @gmail.com>;
Sat, 18 May 2013 21:13:30 -0700 (PDT)
Received-SPF: pass (google.com: domain of [email protected] designates 213.170.43.203 as permitted sender) client-ip=213.170.43.203;
Authentication-Results: mx.google.com;
spf=pass (google.com: domain of [email protected] designates 213.170.43.203 as permitted sender) [email protected]
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Sun, 19 May 2013 06:11:45 +0200
Date: Sun, 19 May 2013 06:11:45 +0200
Subject:
To: jjjjj @gmail.com
From:
Reply-To:
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Return-Path: [email protected]
Message-ID: <[email protected]>
X-OriginalArrivalTime: 19 May 2013 04:11:45.0439 (UTC) FILETIME=[F9B892F0:01CE5446]