协议字符集冲突,电子邮件正文中的ESMTP与XML

我们有一个过程,在这个过程中,XML通过ESMTP在电子邮件正文中传输给我们。电子邮件正文的字符集指定为 ISO-859-1 , and no encoding is specified for the XML. 根据协议,默认值为 UTF-8 .

问题是,我们的XML解析器在遇到_?字符时抛出异常,因为它认为它在解析 UTF-8 以及 UTF-8 是2字节,而不是1 ISO-859-1 .

1. 我们应该假设尸体是 ISO-859-1 从而重写XML编码( UTF-8 )?
2. 更主观地说,电子邮件是否发送错误,我们是否更好地解释为 UTF-8 在我们这边,还是问谁在正确和一致地指定编码?

下面是一个包含XML的电子邮件正文示例:

Delivered-To: ...
Received: ...
Received: ...
Return-Path: ...
Received: ...
Received-SPF: ...
Authentication-Results: ...
Received: ...
Thread-Topic: ...
From: ...
To: ...
Subject: ...
Date: ...
Message-ID: ...
MIME-Version: 1.0
Content-Type: text/plain;
 charset="iso-8859-1"
Content-Transfer-Encoding: 8bit
X-Mailer: Microsoft CDO for Windows 2000
Content-Class: urn:content-classes:message
Importance: normal
Priority: normal
X-MimeOLE: Produced By Microsoft MimeOLE V6.00.3790.4325

<?xml version="1.0"?>
...
   <comments>Super Widget®</comments>
...