using my domain in spam?

I'm getting alot of 'returned mail' that I never sent and is using my domain name in the 'return path'. How do I stop this if possible?

Here are the headers - can somebody read these?:
Return-Path: <[email protected]> <----(the return addy changes all the time)
Received: from es01.ftn.cz (es01.ftn.local [172.16.1.80])
by gaston.ftn.cz (8.12.8/8.12.8) with ESMTP id k7BErCUj022824
for innocent partyFri, 11 Aug 2006 16:53:13 +0200
Received: from localhost ([68.116.192.29]) by es01.ftn.cz with Microsoft SMTPSVC(6.0.3790.1433);
Fri, 11 Aug 2006 16:53:20 +0200
Message-ID: <000001c6bd54$6a99ba80$0100007f@localhost>
From: "Tobe Freeman" <[email protected]>
To: innocent party
Subject: Bill Summary - Invoice #85136
Date: Thu, 10 Aug 2006 10:51:56 -0900
MIME-Version: 1.0
Content-Type: multipart/mixed;
boundary="----=_NextPart_000_0001_01C6BD54.6A99BA80"
X-Priority: 3 (Normal)
X-MSMail-Priority: Normal
X-Mailer: Microsoft Outlook, Build 10.0.3416
Importance: Normal
X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1506
X-Spam-Status: No, score=0.2 required=5.0 tests=MIME_MISSING_BOUNDARY
autolearn=no version=3.0.0
X-Spam-Checker-Version: SpamAssassin 3.0.0 (2004-09-13) on gaston.ftn.cz

And this was the headers from the mail that had the return in it:
Return-Path: <>
Delivered-To: [email protected]
Received: (qmail 12636 invoked by uid 399); 11 Aug 2006 16:42:57 -0000
From: [email protected]****here.biz
Delivered-To: [email protected]
Received: (qmail 12143 invoked by uid 399); 11 Aug 2006 16:42:48 -0000
Received: from unknown (HELO mail2.m****here.biz) (204.14.106.10)
by mail.m****here.biz with SMTP; 11 Aug 2006 16:42:48 -0000
Received: (qmail 18824 invoked by uid 399); 11 Aug 2006 14:53:21 -0000
Received: from gaston.ftn.cz (62.168.16.218)
by mail2.m****here.biz with SMTP; 11 Aug 2006 14:53:21 -0000
Received-SPF: none (mail2.m****here.biz: domain at gaston.ftn.cz does not designate permitted sender hosts)
identity=mailfrom; client-ip=62.168.16.218;
Received: from gaston (root@localhost)
by gaston.ftn.cz (8.12.8/8.12.8) with SMTP id k7BErEPV022855
for <[email protected]>; Fri, 11 Aug 2006 16:53:14 +0200
Date: Fri, 11 Aug 2006 16:53:14 +0200
Message-Id: <[email protected]>
Received: from localhost (localhost)
by gaston.ftn.cz (8.12.8/8.12.8) id k7BErDUh022848;
Fri, 11 Aug 2006 16:53:13 +0200
To: <[email protected]>
MIME-Version: 1.0
Content-Type: multipart/report; report-type=delivery-status;
boundary="k7BErDUh022848.1155307993/gaston.ftn.cz"
Subject: Returned mail: see transcript for details
Auto-Submitted: auto-generated (failure)
X-Spam-Status: No, score=-2.8 required=5.0 tests=ALL_TRUSTED,MISSING_DATE
autolearn=failed version=3.0.0
X-Spam-Checker-Version: SpamAssassin 3.0.0 (2004-09-13) on gaston.ftn.cz

Does this mean that someone is using my domain name at mail.m****here.biz?
 
Thanks tanmaya - Stephen told me to turn SPF to "Fail" for 24 hours - which seemed to have worked. (I actually left it on Fail for 2-3 days.)

I haven't gotten anymore 'return' emails, so the spammer must have moved on...
 
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