如何创建带有与大多数邮件客户端兼容的嵌入图像的电子邮件 [英] How to create an email with embedded images that is compatible with the most mail clients

问题描述

我们创建了一个系统，该系统允许将图像嵌入到待发电子邮件中.

We have created a system that allows embedding an image in an outgoing email.

这是我们的系统创建的原始消息.此示例包含一个图像附件和一个嵌入式图像.

Here is the original message our system creates. This example contains an image attachment and an embedded image.

Mime-Version: 1.0
From: ...
To: ...
CC: 
Subject: test
x-sender: ...
x-mailer: ...
Content-Type: multipart/mixed; boundary="-------------...A128803765634794"

---------------...A128803765634794
Content-Type: multipart/related; boundary="-------------...B128803765634796"

---------------...B128803765634796
Content-Type: text/html; charset="UTF-8"

<p style="margin: 0; padding: 0"><img src="cid:083.gif" alt="" /></p>

---------------...B128803765634796
Content-type: image/gif; name="083.gif"
Content-ID: <083.gif>
X-Attachment-Id: 083.gif
Content-Disposition: Embedded; filename="083.gif"
Content-transfer-encoding: base64

............................................................................
............................................................................
......................................................
---------------PineappleCodeB128803765634796--
---------------PineappleCodeA128803765634794
Content-type: image/gif; name="waiting.gif"
Content-Disposition: Attachment; filename="waiting.gif"
Content-transfer-encoding: base64

............................................................................
............................................................................
......................................................
---------------PineappleCodeA128803765634794--

我应该添加另一个标头还是应该遵循的规则?

Is there another header I should add or rule I should follow?

我注意到一件事 ...我想这是我的问题和Gmail的一部分.但无论如何，我想让它停止发生

I noticed one thing... I would guess that it is part my issue and part Gmails. but at any rate I would like to make it stop happening

在Gmail中收到电子邮件后，我会收到

When the email is received into Gmail I get

不显示图像.
在下方显示图片-始终显示...的图片

Images are not displayed.
Display images below - Always display images from ...

然后将嵌入的图像显示为图像附件(就像我的其他图像附件一样)

The embedded image is then shown as an image attachment (just like my other image attachment)

我单击下面的显示图像，并且我的图像显示在电子邮件的正文中，但未从附件"部分中删除.

I click Display Images Below and my image is shown in the body of the email but not removed from the Attachments section.

如果我回到收件箱并返回到电子邮件，则看起来不错.

If I go back to my in box and back to the email it looks fine.

我不明白为什么要这么做.它不是链接的图像(来自外部URL)，并且当将嵌入式图像从Gmail发送到Gmail时不会发生.那就是让我认为自己做错了什么，恐怕这可能会影响其他接收者.

I do not see why it does that. It it not a linked image (from external URL) and it does not happen when sending embedded images from Gmail to Gmail. That is what makes me think I might be doing somthing wrong and I am afraid that it may affect other recipients.

推荐答案

我已经成功使用了与您使用的标题完全相同的标头，但有以下区别:

I've had success with exactly the same headers as you're using, with the following differences:

• Embedded对于Content-Disposition标头不是有效值. attachment应该没问题.尽管我通常看到attachment用于multipart/related嵌入式图像，但inline也应该很好.

• Embedded is not a valid value for the Content-Disposition header. attachment should be fine. inline should also be fine, though I've usually seen attachment for multipart/related embedded images.

Content-ID标头的值应为与消息相同的格式- id ，它反过来看起来很像一个电子邮件地址. <083.gif@yourmailer>与大多数邮件发件人合作的可能性更高.

The value of the Content-ID header is supposed to be in the same format as a message-id, which in turn looks very much like an email address. <083.gif@yourmailer> has a better chance of working with most mailers.

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