Correo Electrónico - mensaje "Firewall Denial of Service Log"

No paro de recibir correos electronicos enviados desde mi propia cuenta con el asunto "Firewall Denial of Service Log" pero nada mas.
¿Alguien sabe por que?

Adjunto el log de uno de ellos:

X-MDAV-Processed: alpusa.homeip.net, Sat, 02 Apr 2011 18:52:24 +0200
X-Spam-Processed: alpusa.homeip.net, Sat, 02 Apr 2011 18:52:13 +0200
Return-path: <e.garcia@requeni.com>
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Message-ID: <8760AAC6-3CB2-4B45-8E1E-CD3C2BFDC6CF@gamma.infortelecom.net>
From: < e.garcia@requeni.com>
To: < e.garcia@requeni.com>
Subject: Firewall Denial of Service Log
Illegal TCP header DETECTED on Sat Apr 02 17:50:05 2011
targeting 172.30.0.2,0, sent from 83.50.120.244,0
X-Antivirus: avast! (VPS 110402-1, 02/04/2011), Inbound message
X-Antivirus-Status: Clean

Gracias de antemano para quien pueda ayudar.

Saludos