Wormy email messages?

The past few days I've been inundated with emails from, variously, a postmaster, mailer-daemon, or mail delivery subsystem saying that a message I sent didn't go through, blah blah, see attached file for details. I didn't send any of the messages and don't know the supposed recipients. An antivirus scan and Adaware scan turned up nothing on my machine.

I think the attachment is a worm or some such. SpamKiller stops them, but I let one into my email client just to look at it and the attached file was a .pif. I didn't open it, of course.

The question - is this a known way that one of these nasties gets distributed? I can just ignore them with no harm done, but maybe someone is distributing a worm with my address as the "from "? Any ideas how I could tell?

Here's the text part of one of them, as it shows in SpamKiller:

(Quote)

This is an automatically generated Delivery Status Notification.

Delivery to the following recipients failed.

20naid@mcbreo.com

Reporting-MTA: dns;mailbox.corp.mcbreo.com
Received-From-MTA: dns;PNF
Arrival-Date: Sat, 23 Aug 2003 22:06:23 -0700

Final-Recipient: rfc822;20naid@mcbreo.com
Action: failed
Status: 5.1.1

Received: from PNF ([66.227.129.130]) by mailbox.corp.mcbreo.com with Microsoft SMTPSVC(5.0.2195.5329); Sat, 23 Aug 2003 22:06:23 -0700
From: < (my address) >
To: <20naid@mcbreo.com>
Subject: Re: Wicked screensaver
Date: Sun, 24 Aug 2003 1:00:50 --0400
X-MailScanner: Found to be clean
Importance: Normal
X-Mailer: Microsoft Outlook Express 6.00.2600.0000
X-MSMail-Priority: Normal
X-Priority: 3 (Normal)
MIME-Version: 1.0
Content-Type: multipart/mixed; boundary= "_NextPart_000_3B8AB08A "
Return-Path: (my address)
Message-ID: <MAILBOXHYR5EbYyjlMF00003024@mailbox.corp.mcbreo.com>
X-OriginalArrivalTime: 24 Aug 2003 05:06:23.0843 (UTC) FILETIME=[76DE5330:01C369FD]

See the attached file for details

(Unquote)

 

Ah. I had seen that thread before but didn't recognize that it applied. I see now that it does. Thanks.

14 more this morning!