I don't kow Amos. Here are the headers for one I recieved the other day. The to address is 4679@hotpop.com. The only thing I have spotted is the X-Envelope header. That does give my email address.

Jon

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Delivery-date: Thu, 27 Feb 2003 21:24:07 +0000
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        id DJSFHRXF; Thu, 23 Jan 2003 16:40:53 +0200
From: URGENT NOTICE
Reply-To: slaninaamerica@int.rts.co.il
To: 4679@hotpop.com
Subject: INVEST-GET YOUR FAIR SHARE
MIME-Version: 1.0
Content-Type: text/html;
        charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
X-Return-Path: skidgeleugenia@iusi.bas.bg
Message-ID:
Date: Thu, 27 Feb 2003 23:29:52 +0200
X-Envelope-To: jonbanjo@freeuk.com
X-claradeliver-Version: 4.15.0
X-UIDL: 1046381047.17736.buckaroo.freeuk.net
X-RCPT: jonbanjo
Status: U