multipart/mixed 不适用于 thunderbird 和 hotmail，但适用于 Gmail

Question

以下是雷鸟收到的邮件源代码。我找不到任何语法错误，它在 gmail 中运行良好。但对于 hotmail 和 thunderbird，附件已损坏且内容为空白.... 我已经尝试了很长时间来解决这个问题。有帮助吗？

Subject: MySubject
From: testing@test.com
MIME-Version: 1.0
Content-Type: multipart/mixed; boundary="02f05ee7d40220f0ebab50ef7440ca55"
Content-Transfer-Encoding: 7bit
Cc: cc@cc.com
Message-Id: <20161123030114.97B04DCD682@server.com>
Date: Wed, 23 Nov 2016 11:01:14 +0800 (MYT)


--02f05ee7d40220f0ebab50ef7440ca55
Content-Type: text/html; charset="iso-8859-1"
Content-Transfer-Encoding: 8bit
<p>Test</p>

--02f05ee7d40220f0ebab50ef7440ca55
Content-Type: application/pdf; name="Attachment.pdf"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="Attachment.pdf"
PDF ATTACHMENT CODES HERE
PDF ATTACHMENT CODES HERE
PDF ATTACHMENT CODES HERE
PDF ATTACHMENT CODES HERE
PDF ATTACHMENT CODES HERE
--02f05ee7d40220f0ebab50ef7440ca55--

Answer 1

感谢@mkl 的回答。经过一些修改，我的代码成功了！！

"There must be a empty line between header and content." 是重点

Subject: MySubject
From: testing@test.com
MIME-Version: 1.0
Content-Type: multipart/mixed; boundary="02f05ee7d40220f0ebab50ef7440ca55"
Content-Transfer-Encoding: 7bit
Cc: cc@cc.com
Message-Id: <20161123030114.97B04DCD682@server.com>
Date: Wed, 23 Nov 2016 11:01:14 +0800 (MYT)


--02f05ee7d40220f0ebab50ef7440ca55
Content-Type: text/html; charset="iso-8859-1"
Content-Transfer-Encoding: 8bit

<p>Test</p>

--02f05ee7d40220f0ebab50ef7440ca55
Content-Type: application/pdf; name="Attachment.pdf"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="Attachment.pdf"

PDF ATTACHMENT CODES HERE
PDF ATTACHMENT CODES HERE
PDF ATTACHMENT CODES HERE
PDF ATTACHMENT CODES HERE
PDF ATTACHMENT CODES HERE
--02f05ee7d40220f0ebab50ef7440ca55--

multipart/mixed 不适用于 thunderbird 和 hotmail，但适用于 Gmail

multipart/mixed not working in thunderbird and hotmail but Gmail

php

pdf

mime