Annoying email problem

[mick44]

For the past 3 or 4 weeks i have been getting email that looks like it is coming from myself but isn't , anybody got any ideas on how to stop it ?? The return path says it's from me but it isn't .
######### = my email address



Return-Path: <##############>
Received: from switchboard ([12.159.229.35]) by mta06-svc.ntlworld.com
(InterMail vM.4.01.03.37 201-229-121-137-20020806) with ESMTP
id <20031219084957.LCVN1005.mta06-svc.ntlworld.com@switchboard>
for <###############>;
Fri, 19 Dec 2003 08:49:57 +0000
Received: from switchboard [192.9.200.168] by ntlworld.com with eSMTP;
Fri, 19 Dec 2003 02:53:16 -0600
Message-ID: <05a301c3c60e$1fcf821a$b400a8c0@switchboard>
From: "Caleb Haley" <################>
To: <##################>
Subject: spice up your christmas for your wife with this!
Date: Fri, 19 Dec 2003 02:53:16 -0600
MIME-Version: 1.0
Content-Type: text/html; charset="ISO-8859-1"
X-Priority: 3
X-Mailer: ver2
Return-Path: ################
X-Ki: <bWljaGFlbC5uZXdsYW5kQG50bHdvcmxkLmNvbQ==>


mick

It's coming from 192.9.200.168 so normally I would suggest complaining to the company that owns this IP - however I cannot find (for certain) who it belongs to - I would guess Sun MicroSystems as they seem to own chunks either side of it [and it is mentioned in some of their network documentation].