用Python解析电子邮件

我正在编写一个Python脚本来处理从Procmail返回的电子邮件。在本question建议，我用下面的Procmail配置：用Python解析电子邮件

:0: 
|$HOME/process_mail.py

我process_mail.py脚本通过标准输入接收电子邮件这样的：

From hostname Tue Jun 15 21:43:30 2010 
Received: (qmail 8580 invoked from network); 15 Jun 2010 21:43:22 -0400 
Received: from mail-fx0-f44.google.com (209.85.161.44) 
by ip-73-187-35-131.ip.secureserver.net with SMTP; 15 Jun 2010 21:43:22 -0400 
Received: by fxm19 with SMTP id 19so170709fxm.3 
for <[email protected]>; Tue, 15 Jun 2010 18:47:33 -0700 (PDT) 
MIME-Version: 1.0 
Received: by 10.103.84.1 with SMTP id m1mr2774225mul.26.1276652853684; Tue, 15 
Jun 2010 18:47:33 -0700 (PDT) 
Received: by 10.123.143.4 with HTTP; Tue, 15 Jun 2010 18:47:33 -0700 (PDT) 
Date: Tue, 15 Jun 2010 20:47:33 -0500 
Message-ID: <[email protected]> 
Subject: TEST 12 
From: Full Name <[email protected]> 
To: [email protected] 
Content-Type: text/plain; charset=ISO-8859-1 

ONE 
TWO 
THREE

我试图解析消息以这种方式：

>>> import email 
>>> msg = email.message_from_string(full_message)

我想获得'From'，'To'和'Subject'等消息字段。但是，消息对象不包含任何这些字段。

我在做什么错？

来源

2010-06-16 Manuel Ceron

您必须确保线路不会意外地被破坏（因为它们在上面，尽管很难说如果这是一个复制粘贴问题） - 与一个intac吨消息如：

Received: (qmail 8580 invoked from network); 15 Jun 2010 21:43:22 -0400 
Received: from mail-fx0-f44.google.com (209.85.161.44) by ip-73-187-35-131.ip.secureserver.net with SMTP; 15 Jun 2010 21:43:22 -0400 
Received: by fxm19 with SMTP id 19so170709fxm.3 for <[email protected]>; Tue, 15 Jun 2010 18:47:33 -0700 (PDT) 
MIME-Version: 1.0 
Received: by 10.103.84.1 with SMTP id m1mr2774225mul.26.1276652853684; Tue, 15 Jun 2010 18:47:33 -0700 (PDT) 
Received: by 10.123.143.4 with HTTP; Tue, 15 Jun 2010 18:47:33 -0700 (PDT) 
Date: Tue, 15 Jun 2010 20:47:33 -0500 
Message-ID: <[email protected]> 
Subject: TEST 12 
From: Full Name <[email protected]> 
To: [email protected] 
Content-Type: text/plain; charset=ISO-8859-1 

ONE 
TWO 
THREE

然后

msg = email.message_from_string(msgtxt) 
print msg['Subject']

打印TEST 12如所期望。

来源

2010-06-16 02:29:12

如何获取电子邮件的正文？ – Anuj 2014-02-10 13:09:43

如果你真的想要整个RFC2822电子邮件正文与原始MIME结构和所有，在Python解析消息基本上是多余的;身体是第一条空行之后的一切。通常，对于现代消息，您想要解析MIME结构并提取一个或多个身体部位。 – tripleee 2016-06-22 09:35:14

我回答我自己。

我在构建消息的代码中发现了一个错误。它在一些行之间添加换行符，阻止解析器正常工作。

来源

2010-06-16 02:23:45

看起来你有没有预先考虑的附加线，可根据RFC 2822 §2.3.2这是违法的空间换行符：

每个报头字段是逻辑上包括
字段名称字符的单行，结肠，和领域的身体。然而，为了方便
，并且为了处理每行998/78字符限制，可以将报头字段的字段主体部分拆分为多个行表示;其中，这被称为“折叠”。通用规则是
，只要本标准允许折叠空白区域（不是简单的WSP字符），就可以在任何WSP之前插入CRLF。对于
例如，报头字段：
Subject: This is a test 
可以表示为：
Subject: This 
    is a test 

它应该是这个样子：

From hostname Tue Jun 15 21:43:30 2010 
Received: (qmail 8580 invoked from network); 15 Jun 2010 21:43:22 -0400 
Received: from mail-fx0-f44.google.com (209.85.161.44) 
    by ip-73-187-35-131.ip.secureserver.net with SMTP; 15 Jun 2010 21:43:22 -0400 
Received: by fxm19 with SMTP id 19so170709fxm.3 
    for <[email protected]>; Tue, 15 Jun 2010 18:47:33 -0700 (PDT) 
MIME-Version: 1.0 
Received: by 10.103.84.1 with SMTP id m1mr2774225mul.26.1276652853684; Tue, 15 
    Jun 2010 18:47:33 -0700 (PDT) 
Received: by 10.123.143.4 with HTTP; Tue, 15 Jun 2010 18:47:33 -0700 (PDT) 
Date: Tue, 15 Jun 2010 20:47:33 -0500 
Message-ID: <[email protected]> 
Subject: TEST 12 
From: Full Name <[email protected]> 
To: [email protected] 
Content-Type: text/plain; charset=ISO-8859-1 

ONE 
TWO 
THREE

来源

2010-06-16 02:24:47

用Python解析电子邮件

回答

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