email address "spoofed"

From: Tim Laureska (hometeam_at_goeaston.net)
Date: 03/05/04

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    To: "security-basics" <security-basics@securityfocus.com>
Date: Fri, 5 Mar 2004 04:59:04 -0500

    I'm not sure if "spoofing" is the correct term but here is what has
    happened:

    Someone is sending out email messages (with virus laden attachments)
    using our domain name ... they are addressed as coming from
    support@ourdomainname.com (ourdomainame would be our actual domain name)
    which is an email address that we never set up.

    My question is how is this done and is there anything we can do to
    prevent this in the future? The message header looks like this:

    Received: from your-xhtr8hvc4p [68.55.1.207] by ourdomainname.com
      (SMTPD32-8.05) id A3C8DF0118; Fri, 05 Mar 2004 04:09:28 -0500
    Date: Fri, 05 Mar 2004 04:07:07 -0500
    To: info@ourdomainname.com
    Subject: E-mail account security warning.
    From: support@ourdomainname.com
    Message-ID: <oruybbfoofisdsegtve@ourdomainname.com>
    MIME-Version: 1.0
    Content-Type: multipart/mixed;
            boundary="--------hggfurquvkrsejwodibt"
    X-RCPT-TO: <info@ourdomainname.com>
    Status: U
    X-UIDL: 355598192

    Tim

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