多部分/混合内容类型被忽略。

Question

多部分/混合内容类型被忽略。

3

我曾经写过一段代码来以硬编码的方式输出mime电子邮件，这非常容易。后来我创建了一个新的API来处理任何上下文，并且据我所知我复制并粘贴了相关的mime语法。然而，Gmail显示出来的是原始的mime格式。

我正在使用PHP的邮件功能。

以下代码是从Gmail的“显示原始邮件”中复制而来的，除了头部信息之外，与将电子邮件视为文本/纯文本查看时所看到的内容完全相同...我做错了什么？

To: blah@blah.com
Subject: blah blah blah
From: blah <blah@blah.com>
MIME-Version: 1.0
Content-Type: multipart/mixed; boundary="--=_NextPart_BIG_UUID_1"
Message-Id: <20140715225428.7BF8B1CF2@www.blah.com>
Date: Tue, 15 Jul 2014 18:54:28 -0400 (EDT)

----=_NextPart_BIG_UUID_1  
content-type: multipart/alternative; boundary="--=_NextAltPart_BIG_UUID_2"

----=_NextAltPart_BIG_UUID_2
content-type: text/plain; charset=iso-8859-1
content-transfer-encoding: quoted-printable

test text content 

----=_NextAltPart_BIG_UUID_2
content-type: multipart/related; boundary="--=_NextAltRelPart_BIG_UUID_3"

----=_NextAltRelPart_BIG_UUID_3
content-type: text/html; charset=UTF8
content-transfer-encoding: quoted-printable

<html><body><h1>BLAH</h1></body></html>

----=_NextAltRelPart_BIG_UUID_3
content-type: text/plain;
Content-transfer-encoding: base64
Content-ID: <whatever_doesnt_matter.txt>

dGVzdCBjb250ZW50


----=_NextAltRelPart_BIG_UUID_3--

----=_NextAltPart_BIG_UUID_2--

----=_NextPart_BIG_UUID_1 
Content-Type: application/pdf; name=blah.pdf 
ContentDisposition: attachment;
Content-Transfer-Encoding: base64

JVBERBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLA
HBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLA
HBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLA
HTUzMj5dPj4Kc3RhcnR4cmVmCjQ1ODkyNgolJUVPRgo=


----=_NextPart_BIG_UUID_1--

- user3338098

1个回答

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可以查看英文原文，
原文链接

- Nisse Engström · Accepted Answer

看起来没问题，当我试着重现这个问题时它确实能够正常工作（示例在结尾附近）。你需要仔细关注确切的MIME语法，以便在头部和分隔符中产生正确的换行符，如下所述。

电子邮件语法

根据RFC 2046，以下是多部分消息主体结构的一部分摘录。特别注意CRLF。（BNF语法，有些简化）

multipart-body := [preamble CRLF]
                  dash-boundary CRLF
                  body-part *encapsulation
                  close-delimiter
                  [CRLF epilogue]
dash-boundary := "--" boundary
body-part := MIME-part-headers [CRLF *OCTET]
encapsulation := delimiter
                 CRLF body-part
delimiter := CRLF dash-boundary
close-delimiter := delimiter "--"

代码

<?php

$headers  = "From: user@domain.example\r\n";
$headers .= "MIME-Version: 1.0\r\n";
$headers .= "Content-Type: multipart/mixed; boundary=\"--=_NextPart_BIG_UUID_1\"\r\n";

$body  = "----=_NextPart_BIG_UUID_1\r\n";
$body .= "content-type: multipart/alternative; boundary=\"--=_NextAltPart_BIG_UUID_2\"\r\n";
$body .= "\r\n";

$body .= "----=_NextAltPart_BIG_UUID_2\r\n";
$body .= "content-type: text/plain; charset=iso-8859-1\r\n";
$body .= "content-transfer-encoding: quoted-printable\r\n";
$body .= "\r\n";
$body .= "test text content\n";

$body .= "\r\n----=_NextAltPart_BIG_UUID_2";
$body .= "\r\n";
$body .= "content-type: multipart/related; boundary=\"--=_NextAltRelPart_BIG_UUID_3\"\r\n";
$body .= "\r\n";

$body .= "----=_NextAltRelPart_BIG_UUID_3\r\n";
$body .= "content-type: text/html; charset=UTF8\r\n";
$body .= "content-transfer-encoding: quoted-printable\r\n";
$body .= "\r\n";
$body .= "<html><body><h1>BLAH</h1></body></html>\n";

$body .= "\r\n----=_NextAltRelPart_BIG_UUID_3\r\n";
$body .= "content-type: text/plain;\r\n";
$body .= "Content-transfer-encoding: base64\r\n";
$body .= "Content-ID: <whatever_doesnt_matter.txt>\r\n";
$body .= "\r\n";
$body .= "dGVzdCBjb250ZW50\r\n";

$body .= "\r\n----=_NextAltRelPart_BIG_UUID_3--\r\n";

$body .= "\r\n----=_NextAltPart_BIG_UUID_2--\r\n";

$body .= "\r\n----=_NextPart_BIG_UUID_1\r\n";
$body .= "Content-Type: application/pdf; name=blah.pdf\r\n";
$body .= "ContentDisposition: attachment;\r\n";
$body .= "Content-Transfer-Encoding: base64\r\n";
$body .= "\r\n";
$body .= "JVBERBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLA\n";
$body .= "HBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLA\n";
$body .= "HBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLA\n";
$body .= "HTUzMj5dPj4Kc3RhcnR4cmVmCjQ1ODkyNgolJUVPRgo=\r\n";

$body .= "\r\n----=_NextPart_BIG_UUID_1--";

$to = 'user@domain.example';
$subject = 'MIME Test';

return mail ($to, $subject, $body, $headers);
//echo "$headers\n$body\n";

参考资料

注意：本次翻译涉及IT技术，为确保准确性，建议在专业人士的指导下使用。