E-Mail spam problem

Hello experts.
I'm facing a wierd problem with my emai account.
I receiving tons of spans from email adresses starting with my name, such as andre@xxxxxx.com, andre@yyyyy.com.
My email account starts with andre@ and I received the following message today:

Hi. This is the qmail-send program at mail.itemax.de.
I'm afraid I wasn't able to deliver your message to the following addresses.
This is a permanent error; I've given up. Sorry it didn't work out.

<andre@koan.de>:
vdeliver: Invalid or unknown virtual user 'andre'

--- Below this line is a copy of the message.

Return-Path: <andre@extrasoft.com.br>
Received: (qmail 29634 invoked from network); 7 Jul 2006 16:16:07 -0000
Received: from unknown (HELO backup.megabit.net) (213.164.134.3)
 by mail.itemax.de with SMTP; 7 Jul 2006 16:16:07 -0000
Received: (qmail 13921 invoked from network); 7 Jul 2006 16:14:00 -0000
Received: from unknown (HELO backup.megabit.net) (218.65.232.230)
 by backup.megabit.net with SMTP; 7 Jul 2006 16:14:00 -0000
Received: from smtp-gw.extrasoft.com.br
    by 218.65.232.230 (8.12.3 da nor stuldap/8.12.3) with ESMTP id HEZ8AC82VNWwI
    for <andre@koan.de>; Fri, 7 Jul 2006 16:12:57 -0300
Received: from [221.2.241.218]
    by smtp-gw.extrasoft.com.br with ESMTP (8.9.3/8.9.3) id yeeX9nF8VKt5k
    for <andre@koan.de>; Fri, 7 Jul 2006 16:06:57 -0300
Reply-to: "andre@extrasoft.com.br" <andre@extrasoft.com.br>
From: "andre@extrasoft.com.br" <andre@extrasoft.com.br>
Date: Fri, 7 Jul 2006 16:06:01 -0300
Message-ID: 1rcnMaXRPL4Y8.mlpbKNwT5DPox@extrasoft.com.br
To: andre@koan.de
Content-type: text/html;
Charset=Windows-1251
Subject: Try to lose some weight before it is too late. Hoodia 920+ can provide you with all that.
MIME-Version: 1.0

Hoodia <acr></acr>920+ <acv></acv> will get <acl></acl>hundreds <acb></acb>of glances <acl></acl>on your ass.<BR>
<A href="http://www.floverl.com/hd/?80&RV4mwwg4NHnyy">http://www.floverl.com/hd/?80&cFgGNnLMEahfh</a><BR>;
L0oking for a m@gic d1et? <acc></acc>Hoodia 920+ is the best way out.<BR>
If you lack a nice waist, Hoodia 920+ knows how to help you.<BR><BR><BR><BR><BR><BR><BR><BR><BR><BR><BR><BR><BR><BR><BR><BR><BR><BR><BR><BR><BR><BR><BR><BR><BR><BR><BR><BR><BR><BR><BR><BR><BR><BR><BR><BR><BR><BR>dyou know what 1 mean? Bit unnatural. Oh, this <acu></acu>is better,


As far as I can understand, it is saing that I sent an email to someone called andre@koan.de, but I have not idea about this address and I'm sure nobaody here sent that email message.
How can I check if my email account is being used by spammers?
If it is, is there any way to block this actions?

Thanks!
LVL 2
andrepiresAsked:
Who is Participating?
 
PsiCopCommented:
Looks like a spammer is spamming Domains hosted by itemax.de, and giving your E-Mail address as the source.

The mailserver at itemax.de is too stupid to look and see if the sending mailhost is the mailhost for your Domain.

The mailserver is also generating failure messages back to you, based on the bogus info from the spammer.

You cannot prevent a spammer from sending E-Mail claiming to be from you. It's up to the RECEIVING mailserver to exercise some intelligence.

You might be able to filter these bogus bounce messages...exactly how depends on your personal E-Mail infrastructure, which you haven't specified.
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andrepiresAuthor Commented:
I'm blocking these spammers, but they are so many...
Ok.. thanks for helping!
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