为什么Outlook 2010会破坏我的HTML电子邮件正文？

Question

每当我从我自己的服务器（使用我自己的电子邮件代码）向Outlook 2010发送HTML电子邮件时，它会删除每个HTML属性的前2个字符。

下面是来自HTML体片段（见表属性搞砸了）：

<table cellpadding=" cellspacing=" border=" class=ostdata"> 
<thead>        
<tr>          
<th>Field</th>         
<th>Value</th>        
</tr>  
</thead> 
<tr>     
<th>Test</th> 
<td>Hello world!</td> 
</tr> 
</table> 

完整的HTML体从Outlook 2010：

<style> BODY  {font-family:Arial,Helvetica,Tahoma,sans-serif;font-size:12px;font-weight:normal;color:#4F4F4F;margin:8px;padding:0}  H1       {font-size:14px;font-weight:bold;margin-top:18px} .postdata                        {margin:10px;padding:10px 0} .postdata TABLE         {font-family:Arial,Helvetica,Tahoma,sans-serif;font-size:12px;font-weight:normal;color:#4F4F4F}   .postdata TH               {font-weight:bold;color:#FFF;text-align:left;padding:4px 8px;background-color:#555}    .postdata TD              {padding:4px 8px}   .postdata THEAD TH  {font-size:0.85em;font-weight:normal;text-transform:uppercase;background-color:#444} .signature                  {color:#9F9F9F;margin:40px 0 10px 0}</style>Test email with single <table style=olor: red" width=00%"><tr><td>Table data</td></tr></table><table cellpadding=" cellspacing=" border=" class=ostdata"> <thead>        <tr>          <th>Field</th>         <th>Value</th>        </tr>  </thead><tr>    <th>Test</th> <td>Hello world!</td></tr></table> 

从Outlook 2010头（我无法在Outlook 2010中查看整个源代码）：

Return-Path: <REMOVED> 
Delivered-To: REMOVED 
Received: (qmail 31757 invoked by alias); 22 Oct 2014 02:50:45 -0000 
Delivered-To: alias-localdelivery-REMOVED 
Received: (qmail 31751 invoked by uid 102); 22 Oct 2014 02:50:45 -0000 
Date: 22 Oct 2014 02:50:45 -0000 
Message-ID: <20141022025045.31750.REMOVED> 
To: REMOVED 
Subject: 
From: REMOVED 
X-Mailer: MailBot version 1.24 
MIME-Version: 1.0 
Content-Type: multipart/alternative; 
       boundary="MailBot==" 

打开完整的HTML电子邮件wi Mac Mail 7.3：

Return-Path: <REMOVED> 
Delivered-To: REMOVED 
Received: (qmail 32582 invoked by alias); 22 Oct 2014 02:57:39 -0000 
Delivered-To: alias-localdelivery-REMOVED 
Received: (qmail 32579 invoked by uid 102); 22 Oct 2014 02:57:39 -0000 
Date: 22 Oct 2014 02:57:39 -0000 
Message-ID: <20141022025739.32578.REMOVED> 
To: REMOVED 
Subject: 
From: REMOVED 
X-Mailer: MailBot version 1.24 
MIME-Version: 1.0 
Content-Type: multipart/alternative; 
    boundary="MailBot==" 

This is a multipart message in MIME format. 

--MailBot== 
Content-Type: text/plain; 
    charset="us-ascii" 
Content-Transfer-Encoding: 7bit 

Test email with single 

--MailBot== 
Content-Type: text/html; 
    charset="us-ascii" 
Content-Transfer-Encoding: quoted-printable 

<style> BODY {font-family:Arial,Helvetica,Tahoma,sans-serif;font-size:12px;font-weight:normal;color:#4F4F4F;margin:8px;padding:0} H1  {font-size:14px;font-weight:bold;margin-top:18px} .postdata      {margin:10px;padding:10px 0} .postdata TABLE   {font-family:Arial,Helvetica,Tahoma,sans-serif;font-size:12px;font-weight:normal;color:#4F4F4F} .postdata TH    {font-weight:bold;color:#FFF;text-align:left;padding:4px 8px;background-color:#555} .postdata TD    {padding:4px 8px} .postdata THEAD TH {font-size:0.85em;font-weight:normal;text-transform:uppercase;background-color:#444} .signature     {color:#9F9F9F;margin:40px 0 10px 0}</style>Test email with single <table style="color: red" width="100%"><tr><td>Table data</td></tr></table><table cellpadding="0" cellspacing="1" border="0" class="postdata"> <thead>  <tr>   <th>Field</th>   <th>Value</th>  </tr> </thead><tr> <th>Test</th> <td>Hello world!</td></tr></table> 

--MailBot==-- 

为什么Outlook会这样做？

Answer 1

症状与声明Content-Transfer-Encoding: quoted-printable一致，但实际上并未使用此编码，并且您发布的标头似乎证实了这一点。

在QP中，您将有attribute=3D"value"，因为等号是此编码中的元字符，需要编码为=3D。这是可以理解的（虽然可以说并不完全正确），一个等号后跟两个非十六进制（和非新行）字符的序列被Outlook丢弃为非法。无论如何，我会责怪你的发送代码 - 你没有显示 - 而不是Outlook（尽管我个人认为Outlook应该因为其他原因被禁止）。