embedding image in html email

2019-01-02 22:24发布

站内问答 / Oracle
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I'm trying to send a multipart/related html email with embedded gif images. This email is generated using Oracle PL/SQL. My attempts have failed, with the image showing up as a red X (in Outlook 2007 and yahoo mail)

I've been sending html emails for some time, but my requirements are now to use several gif images in the email. I can store these on one of our web servers and just link to them, but many users email clients will not show them automatically and will need to either change settings or manually download them for each email.

So, my thoughts are to embed the image. My questions are:

  1. What am I doing wrong here?
  2. Is the embedding approach the correct one?
  3. Any other options if I need to use more and more images? Attachments won't work, as the images are typically logos and icons that won't make sense out of the context of the message. Also, some elements of the email are links into an online system, so generating a static PDF and attaching won't work (to my knowledge anyway).

snippet:

MIME-Version: 1.0
To: me@gmail.com
BCC: me@yahoo.com
From: email@yahoo.com
Subject: Test
Reply-To: email@yahoo.com
Content-Type: multipart/related; boundary="a1b2c3d4e3f2g1"

--a1b2c3d4e3f2g1

content-type: text/html;

    <html>
    <head><title>My title</title></head>
    <body>
    <div style="font-size:11pt;font-family:Calibri;">
    <p><IMG SRC="cid:my_logo" alt="Logo"></p>

... more html here ...

</div></body></html> 

--a1b2c3d4e3f2g1

Content-Type: image/gif;
Content-ID:<my_logo>
Content-Transfer-Encoding: base64
Content-Disposition: inline

[base64 image data here]

--a1b2c3d4e3f2g1--

Many thanks.

BTW: Yes, I have verified that the base64 data is correct, as I can embed the image in the html itself (using same algo use for creating header data) and see image in Firefox/IE.

I should also note that this is NOT for spam, the emails are sent to specific clients who are expecting it daily. The content is data-driven, and not adverts.

10条回答
何必那么认真
2楼-- · 2019-01-02 22:42

Using Base64 to embed images in html is awesome. Nonetheless, please notice that base64 strings can make your email size big.

Therefore,

1) If you have many images, uploading your images to a server and loading those images from the server can make your email size smaller. (You can get a lot of free services via Google)

2) If there are just a few images in your mail, using base64 strings is definitely an awesome option.

Besides the choices provided by existing answers, you can also use a command to generate a base64 string on linux:

base64 test.jpg
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ら.Afraid
3楼-- · 2019-01-02 22:44

It may be of interest that both Outlook and Outlook Express can generate these multipart image email formats, if you insert the image files using the Insert / Picture menu function.

Obviously the email type must be set to HTML (not plain text).

Any other method (e.g. drag/drop, or any command-line invocation) results in the image(s) being sent as an attachment.

If you then send such an email to yourself, you can see how it is formatted! :)

FWIW, I am looking for a standalone windows executable which does inline images from the command line mode, but there seem to be none. It's a path which many have gone up... One can do it with say Outlook Express, by passing it an appropriately formatted .eml file.

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再贱就再见
4楼-- · 2019-01-02 22:47

  1. You need 3 boundaries for inline images to be fully compliant.

  2. Everything goes inside the multipart/mixed.

  3. Then use the multipart/related to contain your multipart/alternative and your image attachment headers.

  4. Lastly, include your downloadable attachments inside the last boundary of multipart/mixed.

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混吃等死
5楼-- · 2019-01-02 22:47

For those who couldnt get one of these solutions working: Send inline image in email Following the steps laid out in the solution offered by @T30 i was able to get my inline image to display without being blocked by outlook (previous methods it was blocked). If you are using exchange like we are then also when doing: 

service = new ExchangeService(ExchangeVersion);
service.AutodiscoverUrl("email@domain.com");
SmtpClient smtp = new SmtpClient(service.Url.Host);

you will need to pass it your exchange service url host. Other than that following this solution should allow you to easily send embedded imgages.

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Fickle 薄情
6楼-- · 2019-01-02 22:50

Try to insert it directly, this way you can insert multiple images at various locations in the email.

<img src="data:image/jpg;base64,{{base64-data-string here}}" />

And to make this post usefully for others to: If you don't have a base64-data string, create one easily at: http://www.motobit.com/util/base64-decoder-encoder.asp from a image file.

Email source code looks something like this, but i really cant tell you what that boundary thing is for:

 To: email@email.de
 Subject: ...
 Content-Type: multipart/related;
 boundary="------------090303020209010600070908"

This is a multi-part message in MIME format.
--------------090303020209010600070908
Content-Type: text/html; charset=ISO-8859-15
Content-Transfer-Encoding: 7bit

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>

    <meta http-equiv="content-type" content="text/html; charset=ISO-8859-15">
  </head>
  <body bgcolor="#ffffff" text="#000000">
    <img src="cid:part1.06090408.01060107" alt="">
  </body>
</html>

--------------090303020209010600070908
Content-Type: image/png;
 name="moz-screenshot.png"
Content-Transfer-Encoding: base64
Content-ID: <part1.06090408.01060107>
Content-Disposition: inline;
 filename="moz-screenshot.png"

[base64 image data here]

--------------090303020209010600070908--

//EDIT: Oh, i just realize if you insert the first code snippet from my post to write an email with thunderbird, thunderbird automatically changes the html code to look pretty much the same as the second code in my post.

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地球回转人心会变
7楼-- · 2019-01-02 22:55

If you are using Outlook to send a static image with hyperlink, an easy way would be to use Word.

  1. Open MS Word
  2. Copy the image onto a blank page
  3. Add hyperlink to the image (Ctrl + K)
  4. Copy the image to your email
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