邮件分析，自认为是高手的请进来！

请分析此邮件是用什么方法或者什么软件发送出来的，谢谢！
源信头如下:

Return-Path: <zejouz@yellowweb.co.jp>
Delivered-To: <!-- e --><a href="mailto:******@sohu.com">******@sohu.com</a><!-- e -->
Received: from sohumx11.sohu.com (unknown [192.168.132.114])
by mx46.mail.sohu.com (Postfix) with ESMTP id 9E8B2AAA61
for <******@sohu.com>; Wed, 14 May 2008 15:18:09 +0800 (CST)
Received: from mail.yellowweb.co.jp (unknown [210.166.220.24])
by sohumx11.sohu.com (Postfix) with ESMTP id 2DCCE1522886F;
Wed, 14 May 2008 15:18:06 +0800 (CST)
Received: from insye (unknown [218.20.154.63])
by mail.yellowweb.co.jp (Postfix) with ESMTP id 37C7B1220BF4;
Wed, 14 May 2008 15:47:45 +0900 (JST)
From: =?GB2312?B?zsTX5sG8?= <zejouz@yellowweb.co.jp>
Subject: =?GB2312?B?cjM1N9HQt6LW0LjfsuO1xLnYvPy8qNCn1rix6jRJTlQ=?=
To: <!-- e --><a href="mailto:hrdl@neusoft.com">hrdl@neusoft.com</a><!-- e -->
Content-Type: multipart/mixed; charset="GB2312"; boundary="fxmKX57=_zhYbhCAldNvTwYOg1U6BSbUIa"
MIME-Version: 1.0
Date: Wed, 14 May 2008 14:47:52 +0800
Message-Id: <20080514064745.37C7B1220BF4@mail.yellowweb.co.jp>
X-SOHU-UID: 27815.1210749489.650376.651

This is a multi-part message in MIME format

--fxmKX57=_zhYbhCAldNvTwYOg1U6BSbUIa
Content-Type: text/plain
Content-Transfer-Encoding: 8bit

从下往上数第一个 Received: 段是发件人的真实 ip，邮寄的路线是

insye (unknown [218.20.154.63] =>
mail.yellowweb.co.jp (Postfix) =>
mail.yellowweb.co.jp (unknown [210.166.220.24] =>
sohumx11.sohu.com (Postfix) =>
sohumx11.sohu.com (unknown [192.168.132.114] =>
mx46.mail.sohu.com (Postfix)

应该是广州的群发者用 smtp 方式通过在日本邮件服务器上的帐号向你 sohu 的邮箱发送的垃圾邮件。发件人应该没有隐藏自己的帐号，可以向 mail.yellowweb.co.jp 投诉 zejouz 这个用户。

过滤这种垃圾邮件的方式比较简单，收件人不是你的用户名的邮件一律拒收。