I've fairly recently setup a mail server to:

1) learn about email and server configurations and all that goes along
with administrating it.

2) And being able to recieve loads of email from freebsd-questions without
fear of restriction on any other account (i.e. loss of email that I want
to save).

Anyhow, within the month that I've had my server running I've been
recieving numerous emails that are obviously malicious to Windows users
(i.e. contain an attachment with some random-letters.exe and nonsense
about a patch). In short my concern is not that me or my wife will run
this, sense we don't use Windows, but whether these emails are just spam
or if it is my fault.

If said emails are just spam, fine. Not to say that I like spam but it
gives me a reason to learn how to setup a spam filter and/or tarpit. The
reason I worry that it's not just spam is that there are only 2 accounts,
mine and my wifes, and she doesn't use her's except to email me and I've
only used mine to setup freebsd-questions and email her. So why would I be
getting spam? So then I think maybe it's my fault.

What I mean by my fault is, is my machine being used to relay spam and
then I am getting bounces from the poor people recieve this crap? I really
would hate for this to be the case. Even if said emails are not my fault
how do I assure that I am not relaying spam unbeknown to me?

This is a sample header from one such email. Now I'm not too sure how to
take this.

Return-Path: <[EMAIL PROTECTED]>
Received: from mail.themango.org ([unix socket])
     by mail.themango.org (Cyrus v2.2.3) with LMTP; Tue, 17 Feb 2004
16:06:23 -0600
X-Sieve: CMU Sieve 2.2
Received: from centennialrd.net (unknown [])
     by themango.org (Postfix) with ESMTP id B2194450F2
     for <[EMAIL PROTECTED]>; Tue, 17 Feb 2004 16:06:21 -0600 (CST)
Received: from qexstrg (jp [])
     by centennialrd.net (8.12.10/8.12.10) with SMTP id i1HLwZHp022746;
     Tue, 17 Feb 2004 17:58:36 -0400
Date: Tue, 17 Feb 2004 17:58:35 -0400
From: "Technical Bulletin" <[EMAIL PROTECTED]>
SUBJECT: Newest Microsoft Patch
Mime-Version: 1.0
Content-Type: multipart/mixed; boundary="bicnhrvs"

My configuration is FreeBSD 5.2.1, Postfix + Cyrus

Thanks for any help,

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