Question : Received SPAM email from "system email" to install a patch from Microsoft

Received an email thru our hosted exchange to a valid email on exchange.  How can this happen and can it be prevented?

Microsoft Mail Internet Headers Version 2.0
Thread-Topic: Attention: Read Carefully
X-Antispam: NO; Spamcatcher 5.2.1. Score 10
Received: from [61.38.92.69] ([61.38.92.69]) by mailserver.com with Microsoft SMTPSVC(6.0.3790.3959); Mon, 26 Oct 2009 07:02:23 -0500
Received: from [79.89.241.10] (helo=wmvmeqgw.lgvkndbfhrfm.org) by  with esmtpa (Exim 4.69) (envelope-from ) id 1MMEF5-6760gp-2X for [email protected]; Mon, 26 Oct 2009 20:58:32 +0900
From: "System"
To:
Subject: Attention: Read Carefully
Date: Mon, 26 Oct 2009 20:58:32 +0900
MIME-Version: 1.0
Content-Type: text/plain;
      format=flowed;
      charset="windows-1250";
      reply-type=original
Content-Transfer-Encoding: quoted-printable
X-Priority: 3
X-MSMail-Priority: Normal
X-Mailer: Microsoft Outlook Express 6.00.3759.2283
X-MimeOLE: Produced By Microsoft MimeOLE V6.00.3790.4325
X-Spam: Not detected
Return-Path:
Message-ID: 64f@mailserver.com>
X-OriginalArrivalTime: 26 Oct 2009 12:02:24.0343 (UTC) FILETIME=[2DFE9E70:01CA5634]

Answer : Received SPAM email from "system email" to install a patch from Microsoft

If you setup an SPF (Sender Policy Framework) record in your domains DNS records and then implement SPF checking for inbound emails, you will stop this type of malicious spam.

If you also check against IP blacklists, such as the Barracuda Block List, you should also block most mail like this.

Alternatively, implement a better anti-spam solution such as Vamsoft ORF (www.vamsoft.com).

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