請教各位：
我最近接連四次碰到這種情況：在yahoo寄信某個朋友（四次都是寄給同一個人，她的信件伺服器是hinet的），每次都是隔好幾天，然後收到一封退信通知，內容是一堆英文。我把前面一小段貼上來請大家幫忙看一下。
（下文中電郵位址的“＃＃＃＃“是為隱私所打的馬賽克，請見諒。
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Sorry, we were unable to deliver your message to the following address.
<＃＃＃＃pam@msa.hinet.net>:
Mail server for "msa.hinet.net" unreachable for too long
--- Below this line is a copy of the message.
Received: from [119.160.244.76] by n2.bullet.tw1.yahoo.com with NNFMP; 08 Sep 2008 01:03:39 -0000
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Date: Mon, 8 Sep 2008 09:03:38 +0800 (CST)
From: =?big5?B?rHisSyCxaQ==?= <all＃＃＃＃@kimo.com>
Subject: =?big5?B?UmU6IKF1vkG37aq6ptuocKHQpEi7ULLVwrSquqfGsea7ULBstE2hdg==?=
=?big5?B?xaqr4bdQ?=
To: Joan <＃＃＃＃pam@msa.hinet.net>
MIME-Version: 1.0
Content-Type: multipart/mixed; boundary="0-272112866-1220835818=:42527"
Message-ID: <577539.42527.qm@web73015.mail.tp2.yahoo.com>
（後面還有一大串的英文和無意義的字母、數字組合）
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我寄給朋友的內容只是幾行文字，偶而附加個pdf檔，怎麼會說檔案太長呢？
這倒底是什麼回事，有誰可以解惑呢？謝謝各位！
