Yahoo hk Email Spam

This email spam goes this way:

Dear Friend,

Mr Patrick K. W. Chan.
(pk_22wchan at yahoo dot com dot hk)

Letme start by introducing myself,i am Mr. Patrick K. W. Chan. Executive
Director and Chief Financial Officer of the Hang Seng Bank Ltd.I have a
secured business proposal for you.l will like to know if you are willing
to assist me,lf interested please contact me on my private email address
(pk_22wchan at yahoo dot com dot hk) for more details. Your earliest response to this
mail will be highly appreciated.

My Esteemed Regards,
Mr Patrick K.W. Chan.

It came in through different back-doors' details:

Return-Path: pk_44chan at yahoo dot com
(domain at yahoo.com does not designate permitted sender hosts)
Received: (qmail 7065 invoked by uid 518); 11 Apr 2007 16:48:16 -0000
Message-ID: 20070411164816.499.qmail at s444.sureserver dot com
Reply-To: "=?iso-8859-1?Q?Mr=20Patrick=20K.W=20Chan?=" pk_44chan at yahoo dot com
From: "=?iso-8859-1?Q?Mr=20Patrick=20K.W=20Chan?="
To: yahoo at yahoo dot com
Subject: YOUR SWIFT RESPONSE WILL BE APPRECIATED!!!
Date: Wed, 11 Apr 2007 16:48:16 +0000
X-Mailer: WebMail 2.55
X-Originating-IP: 81.199.173.56
X-Originating-Email: steve at youthsportsmarketing dot com