发送HOTMAIL出现错误！着急的等待解决！

ahhfauliuhu

无法将您的邮件投递至以下指定地址:
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Received: Wed, 8 Aug 2007 00:01:13 +0800
From: welcome to big! <XXXXXXX@chinatennis.org.cn>
To: XXXXXXX@hotmail.com
Subject: Wb2312?Q?测试一下啊！谢谢了?Date: Wed, 8 Aug 2007 00:01:13 +0800
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测试一下啊！谢谢了
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ahhfauliuhu

IP如何做反向解析？