Html Gmail 阻止电子邮件模板中的小型嵌入式内嵌图像
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原文地址: http://stackoverflow.com/questions/41946783/
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StackOverFlow
Gmail blocking small embedded inline images in email template
提问by user1186050
I'm sending emails to my members and it looks like Gmail is blocking the images I place in the email. These are embedded as a base 64 encodedstring in an img tag. I've looked at multiple threads online about Gmail not sending images but haven't found anything that helps. Here are some of the things I've tried so far. 1. enabled external images in Gmail (through the settings icon) 2. reduced the size of the images to under 8000 bytes (Outlook.com wouldn't send images ~ 15000 bytes)
我正在向我的会员发送电子邮件，但 Gmail 似乎阻止了我放置在电子邮件中的图片。它们作为base 64 编码的字符串嵌入到 img 标签中。我在网上查看了多个关于 Gmail 不发送图片的主题，但没有找到任何有用的内容。以下是我迄今为止尝试过的一些方法。1. 在 Gmail 中启用外部图像（通过设置图标） 2. 将图像的大小减小到 8000 字节以下（Outlook.com 不会发送图像 ~ 15000 字节）
I receive the images just fine if I send to an outlook.com email address, but in Gmail the src of the img tag is empty, and no images show up in the email. I'm using https://putsmail.comto test/send my emails, so I know the issue isn't a problem with SendGrid (my email sending service) or my application.
如果我发送到 Outlook.com 电子邮件地址，我可以很好地收到图像，但在 Gmail 中，img 标签的 src 是空的，并且电子邮件中没有图像显示。我正在使用https://putsmail.com来测试/发送我的电子邮件，所以我知道问题不是 SendGrid（我的电子邮件发送服务）或我的应用程序的问题。
Here is one of my templates below. I'm using an email template from litmuss. Everything below is basically default except the extra info I've added like the images and some extra text in the email body.
下面是我的模板之一。我正在使用 litmuss 的电子邮件模板。除了我添加的额外信息（如图像和电子邮件正文中的一些额外文本）之外，下面的所有内容基本上都是默认的。
Here is a jsfiddlewith a complete template with image data that can be copied right into putsmail and be sent to test! Any help or info as to why Gmail doesn't send the images would be great!
这是一个带有完整模板的jsfiddle，其中包含可以直接复制到 putsmail 中并发送给测试的图像数据！关于 Gmail 为什么不发送图像的任何帮助或信息都会很棒！
<!DOCTYPE html>
<html>
<head>
<title></title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<style type="text/css">
/* FONTS */
@@media screen {
@@font-face {
font-family: 'Lato';
font-style: normal;
font-weight: 400;
src: local('Lato Regular'), local('Lato-Regular'), url(https://fonts.gstatic.com/s/lato/v11/qIIYRU-oROkIk8vfvxw6QvesZW2xOQ-xsNqO47m55DA.woff) format('woff');
}
@@font-face {
font-family: 'Lato';
font-style: normal;
font-weight: 700;
src: local('Lato Bold'), local('Lato-Bold'), url(https://fonts.gstatic.com/s/lato/v11/qdgUG4U09HnJwhYI-uK18wLUuEpTyoUstqEm5AMlJo4.woff) format('woff');
}
@@font-face {
font-family: 'Lato';
font-style: italic;
font-weight: 400;
src: local('Lato Italic'), local('Lato-Italic'), url(https://fonts.gstatic.com/s/lato/v11/RYyZNoeFgb0l7W3Vu1aSWOvvDin1pK8aKteLpeZ5c0A.woff) format('woff');
}
@@font-face {
font-family: 'Lato';
font-style: italic;
font-weight: 700;
src: local('Lato Bold Italic'), local('Lato-BoldItalic'), url(https://fonts.gstatic.com/s/lato/v11/HkF_qI1x_noxlxhrhMQYELO3LdcAZYWl9Si6vvxL-qU.woff) format('woff');
}
}
/* CLIENT-SPECIFIC STYLES */
body, table, td, a {
-webkit-text-size-adjust: 100%;
-ms-text-size-adjust: 100%;
}
table, td {
mso-table-lspace: 0pt;
mso-table-rspace: 0pt;
}
img {
-ms-interpolation-mode: bicubic;
}
/* RESET STYLES */
img {
border: 0;
height: auto;
line-height: 100%;
outline: none;
text-decoration: none;
}
table {
border-collapse: collapse !important;
}
body {
height: 100% !important;
margin: 0 !important;
padding: 0 !important;
width: 100% !important;
}
/* iOS BLUE LINKS */
a[x-apple-data-detectors] {
color: inherit !important;
text-decoration: none !important;
font-size: inherit !important;
font-family: inherit !important;
font-weight: inherit !important;
line-height: inherit !important;
}
/* MOBILE STYLES */
@@media screen and (max-width:600px) {
h1 {
font-size: 32px !important;
line-height: 32px !important;
}
}
/* ANDROID CENTER FIX */
div[style*="margin: 16px 0;"] {
margin: 0 !important;
}
</style>
</head>
<body style="background-color: #f4f4f4; margin: 0 !important; padding: 0 !important;">
<!-- HIDDEN PREHEADER TEXT -->
<div style="display: none; font-size: 1px; color: #fefefe; line-height: 1px; font-family: 'Lato', Helvetica, Arial, sans-serif; max-height: 0px; max-width: 0px; opacity: 0; overflow: hidden;">
We're thrilled you created a YogaBandy event! Get ready for members to register.
</div>
<table border="0" cellpadding="0" cellspacing="0" width="100%">
<!-- LOGO -->
<tr>
<td bgcolor="#16749F" align="center">
<!--[if (gte mso 9)|(IE)]>
<table align="center" border="0" cellspacing="0" cellpadding="0" width="600">
<tr>
<td align="center" valign="top" width="600">
<![endif]-->
<table border="0" cellpadding="0" cellspacing="0" width="100%" style="max-width: 600px;">
<tr>
<td align="center" valign="top" style="padding: 40px 10px 40px 10px;">
<a href="https://YogaBandy.com" target="_blank">
<img alt="Logo" src="http://litmuswww.s3.amazonaws.com/community/template-gallery/ceej/logo.png" width="40" height="40" style="display: block; width: 40px; max-width: 40px; min-width: 40px; font-family: 'Lato', Helvetica, Arial, sans-serif; color: #ffffff; font-size: 18px;" border="0">
</a>
</td>
</tr>
</table>
<!--[if (gte mso 9)|(IE)]>
</td>
</tr>
</table>
<![endif]-->
</td>
</tr>
<!-- HERO -->
<tr>
<td bgcolor="#16749F" align="center" style="padding: 0px 10px 0px 10px;">
<!--[if (gte mso 9)|(IE)]>
<table align="center" border="0" cellspacing="0" cellpadding="0" width="600">
<tr>
<td align="center" valign="top" width="600">
<![endif]-->
<table border="0" cellpadding="0" cellspacing="0" width="100%" style="max-width: 600px;">
<tr>
<td bgcolor="#ffffff" align="center" valign="top" style="padding: 40px 20px 20px 20px; border-radius: 4px 4px 0px 0px; color: #111111; font-family: 'Lato', Helvetica, Arial, sans-serif; font-size: 48px; font-weight: 400; letter-spacing: 4px; line-height: 48px;">
<h2 style="font-size: 48px; font-weight: 400; margin: 0;">Event Created</h2>
</td>
</tr>
</table>
<!--[if (gte mso 9)|(IE)]>
</td>
</tr>
</table>
<![endif]-->
</td>
</tr>
<!-- COPY BLOCK -->
<tr>
<td bgcolor="#f4f4f4" align="center" style="padding: 0px 10px 0px 10px;">
<!--[if (gte mso 9)|(IE)]>
<table align="center" border="0" cellspacing="0" cellpadding="0" width="600">
<tr>
<td align="center" valign="top" width="600">
<![endif]-->
<table border="0" cellpadding="0" cellspacing="0" width="100%" style="max-width: 600px;">
<!-- COPY -->
<tr>
<td bgcolor="#ffffff" align="left" style="padding: 20px 30px 40px 30px; color: #666666; font-family: 'Lato', Helvetica, Arial, sans-serif; font-size: 18px; font-weight: 400; line-height: 25px;">
<p style="margin: 0;">We're excited you have created an event. Here are some of the details below.</p>
</td>
</tr>
<!-- Host Space -->
<tr>
<td bgcolor="#ffffff" align="left" style="padding: 20px 30px 40px 30px; color: #666666; font-family: 'Lato', Helvetica, Arial, sans-serif; font-size: 18px; font-weight: 400; line-height: 25px;">
<p style="margin: 0;">
<a href="https://www.YogaBandy.com/Space/Public/@Model.SpaceId" target="_blank" class="thumbnail" style="margin-bottom: 0px;">
<img alt="SpaceImage" title="Space Image" style="display: block" width="225" height="126" src="data:image/jpg;base64,@Raw(Model.SpaceThumbnail)" />
<div class="caption">
@Model.SpaceName
</div>
</a>
</p>
</td>
</tr>
<!-- Host Image -->
<tr>
<td bgcolor="#ffffff" align="left" style="padding: 20px 30px 40px 30px; color: #666666; font-family: 'Lato', Helvetica, Arial, sans-serif; font-size: 18px; font-weight: 400; line-height: 25px;">
<p style="margin: 0;">
<a href="https://www.YogaBandy.com/Profile/Public/@Model.HostId" target="_blank" class="thumbnail" style="margin-bottom: 0px;">
<img alt="HostImage" title="Host Image" style="display: block" width="225" height="225" src="data:image/jpg;base64,@Raw(Model.HostThumbnail)" />
<div class="caption">
@Model.HostName
</div>
</a>
</p>
</td>
</tr>
<!-- DATE -->
<tr>
<td bgcolor="#ffffff" align="left" style="padding: 20px 30px 40px 30px; color: #666666; font-family: 'Lato', Helvetica, Arial, sans-serif; font-size: 18px; font-weight: 400; line-height: 25px;">
<p style="margin: 0;">@Model.Date.ToLongDateString()</p>
</td>
</tr>
<!-- TIME -->
<tr>
<td bgcolor="#ffffff" align="left" style="padding: 20px 30px 40px 30px; color: #666666; font-family: 'Lato', Helvetica, Arial, sans-serif; font-size: 18px; font-weight: 400; line-height: 25px;">
<p style="margin: 0;">
<div>Time: @Model.Date.ToShortTimeString()</div>
</p>
</td>
</tr>
<!-- Location -->
<tr>
<td bgcolor="#ffffff" align="left" style="padding: 20px 30px 40px 30px; color: #666666; font-family: 'Lato', Helvetica, Arial, sans-serif; font-size: 18px; font-weight: 400; line-height: 25px;">
<p style="margin: 0;">@Model.Location</p>
</td>
</tr>
<!-- DURATION -->
<tr>
<td bgcolor="#ffffff" align="left" style="padding: 20px 30px 40px 30px; color: #666666; font-family: 'Lato', Helvetica, Arial, sans-serif; font-size: 18px; font-weight: 400; line-height: 25px;">
<p style="margin: 0;">@Model.Duration</p>
</td>
</tr>
<!-- STYLE -->
<tr>
<td bgcolor="#ffffff" align="left" style="padding: 20px 30px 40px 30px; color: #666666; font-family: 'Lato', Helvetica, Arial, sans-serif; font-size: 18px; font-weight: 400; line-height: 25px;">
<p style="margin: 0;">@Model.Style</p>
</td>
</tr>
<!-- BULLETPROOF BUTTON -->
<tr>
<td bgcolor="#ffffff" align="left">
<table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td bgcolor="#ffffff" align="center" style="padding: 20px 30px 60px 30px;">
<table border="0" cellspacing="0" cellpadding="0">
<tr>
<td align="center" style="border-radius: 3px;" bgcolor="#16749F"><a href="" target="_blank" style="font-size: 20px; font-family: Helvetica, Arial, sans-serif; color: #ffffff; text-decoration: none; color: #ffffff; text-decoration: none; padding: 15px 25px; border-radius: 2px; border: 1px solid #16749F; display: inline-block;">Add To Calendar</a></td>
</tr>
</table>
</td>
</tr>
</table>
</td>
</tr>
<!-- COPY -->
<tr>
<td bgcolor="#ffffff" align="left" style="padding: 0px 30px 20px 30px; color: #666666; font-family: 'Lato', Helvetica, Arial, sans-serif; font-size: 18px; font-weight: 400; line-height: 25px;">
<p style="margin: 0;">If you have any questions, just send an email to the support address—we're always happy to help out.</p>
</td>
</tr>
<!-- COPY -->
<tr>
<td bgcolor="#ffffff" align="left" style="padding: 0px 30px 40px 30px; border-radius: 0px 0px 4px 4px; color: #666666; font-family: 'Lato', Helvetica, Arial, sans-serif; font-size: 18px; font-weight: 400; line-height: 25px;">
<p style="margin: 0;">Cheers,<br>The YogaBandy Team</p>
</td>
</tr>
</table>
<!--[if (gte mso 9)|(IE)]>
</td>
</tr>
</table>
<![endif]-->
</td>
</tr>
<!-- SUPPORT CALLOUT -->
<tr>
<td bgcolor="#f4f4f4" align="center" style="padding: 30px 10px 0px 10px;">
<!--[if (gte mso 9)|(IE)]>
<table align="center" border="0" cellspacing="0" cellpadding="0" width="600">
<tr>
<td align="center" valign="top" width="600">
<![endif]-->
<table border="0" cellpadding="0" cellspacing="0" width="100%" style="max-width: 600px;">
<!-- HEADLINE -->
<tr>
<td bgcolor="#157b9d" align="center" style="padding: 30px 30px 30px 30px; border-radius: 4px 4px 4px 4px; color: #666666; font-family: 'Lato', Helvetica, Arial, sans-serif; font-size: 18px; font-weight: 400; line-height: 25px;">
<h2 style="font-size: 20px; font-weight: 400; color: #111111; margin: 0;">Need more help?</h2>
<p style="margin: 0;"><a href="https://YogaBandy/Contact.com" target="_blank" style="color: #FFFFFF;">We’re here, ready to help</a></p>
</td>
</tr>
</table>
<!--[if (gte mso 9)|(IE)]>
</td>
</tr>
</table>
<![endif]-->
</td>
</tr>
<!-- FOOTER -->
<tr>
<td bgcolor="#f4f4f4" align="center" style="padding: 0px 10px 0px 10px;">
<!--[if (gte mso 9)|(IE)]>
<table align="center" border="0" cellspacing="0" cellpadding="0" width="600">
<tr>
<td align="center" valign="top" width="600">
<![endif]-->
<table border="0" cellpadding="0" cellspacing="0" width="100%" style="max-width: 600px;">
<!-- NAVIGATION -->
<!-- PERMISSION REMINDER -->
<tr>
<td bgcolor="#f4f4f4" align="left" style="padding: 0px 30px 30px 30px; color: #666666; font-family: 'Lato', Helvetica, Arial, sans-serif; font-size: 14px; font-weight: 400; line-height: 18px;">
<p style="margin: 0;">You received this email because you just created a YogaBandy event. If it looks weird, <a href="https://YogaBandy.com" target="_blank" style="color: #111111; font-weight: 700;">view it in your browser</a>.</p>
</td>
</tr>
<!-- UNSUBSCRIBE -->
<!-- ADDRESS -->
</table>
<!--[if (gte mso 9)|(IE)]>
</td>
</tr>
</table>
<![endif]-->
</td>
</tr>
</table>
</body>
</html>回答by Kul-Tigin
Google refuses to show images with data url in Gmail's web interface. It's a known problem (in Google's view a security measure) for a long time highly criticized.
Google 拒绝在 Gmail 的网络界面中显示带有数据 url 的图像。这是一个众所周知的问题（在谷歌看来是一种安全措施）长期以来受到高度批评。
The good news is that you have another option except for using external images.
好消息是除了使用外部图像之外，您还有另一种选择。
Using an inline attachment with a Content-ID works with Gmail.
使用带有 Content-ID 的内嵌附件适用于 Gmail。
After adding your images as inline attachments you'll need to point CID URLsinstead of Data URLsin the html body.
将图像添加为内嵌附件后，您需要在 html 正文中指向CID URL而不是数据 URL。
There are plenty of modern libraries that will allow you to send emails with inline attachments easily. But I wrote a sample script in VBScript with CDO library, ready to use if you have a box Windows 2000+ installed.
有许多现代库可以让您轻松发送带有内联附件的电子邮件。但是我用带有 CDO 库的 VBScript 编写了一个示例脚本，如果您安装了 Windows 2000+，就可以使用了。
Let's prepare the test environment.
让我们准备测试环境。
Put the files in a directory as in the screenshot below.
将文件放在一个目录中，如下面的屏幕截图所示。
tpl.htmlis the template file you gave. You'll need to make some changes in this file.
tpl.html是你给的模板文件。您需要在此文件中进行一些更改。
Replace both imgelements with the following respectively. Note that data urls gone. image1and image2are the Content IDs specified for each inline attachments in the script. Nothing associated with file names here.
img分别用以下内容替换这两个元素。请注意，数据网址不见了。image1和image2是为脚本中的每个内嵌附件指定的内容 ID。这里没有与文件名相关的任何内容。
<img src="cid:image1" alt="SpaceImage" title="Space Image" style="display: block" width="225" height="126" />
<img src="cid:image2" alt="HostImage" title="Host Image" style="display: block" width="225" height="225" />
Embedded.vbs:
嵌入式.vbs：
MsgBox "Wait while your email is being sent.", vbOKOnly Or vbInformation
'************ CONFIGURATION *************
Const smtpUsername = "..."
Const smtpPassword = "..."
Const smtpHost = "smtp.sendgrid.net"
Const smtpPort = 587
Const senderEmail = "...@..."
Const recipientEmail = "[email protected]"
'************ CONFIGURATION *************
Const cdoRefTypeId = 0
Set Fso = CreateObject("Scripting.FileSystemObject")
Set objMail = CreateObject("CDO.Message")
With objMail.Configuration
.Fields("http://schemas.microsoft.com/cdo/configuration/smtpauthenticate") = 1
.Fields("http://schemas.microsoft.com/cdo/configuration/sendusername") = smtpUsername
.Fields("http://schemas.microsoft.com/cdo/configuration/sendpassword") = smtpPassword
.Fields("http://schemas.microsoft.com/cdo/configuration/smtpserver") = smtpHost
.Fields("http://schemas.microsoft.com/cdo/configuration/smtpserverport") = smtpPort
.Fields("http://schemas.microsoft.com/cdo/configuration/sendusing") = 2
.Fields("http://schemas.microsoft.com/cdo/configuration/smtpconnectiontimeout") = 20 'secs
.Fields.Update
End With
With objMail
.AutoGenerateTextBody = False
.From = senderEmail
.To = recipientEmail
.Subject = "Inline Image Test"
.BodyPart.ContentTransferEncoding = "quoted-printable"
.BodyPart.Charset = "utf-8"
'Adding images as inline attachments with Content IDs which is used with image sources. e.g. <img src="cid:image1"
.AddRelatedBodyPart Fso.GetAbsolutePathName("image1.jpg"), "image1", cdoRefTypeId
.AddRelatedBodyPart Fso.GetAbsolutePathName("image2.jpg"), "image2", cdoRefTypeId
'append html body from file
.HTMLBody = Fso.OpenTextFile("tpl.html").ReadAll
.Send
End With
MsgBox "Email successfully sent! Check your inbox.", vbOKOnly Or vbInformation
Double click and wait for instructions.
双击并等待指示。
See also https://stackoverflow.com/search?q=is%3Aquestion+%5Bemail%5D+inline+image
另见https://stackoverflow.com/search?q=is%3Aquestion+%5Bemail%5D+inline+image
回答by Serg Chernata
tl;dr
tl;博士
Gmail and certain other clients don't like base64encoded images.
Gmail 和某些其他客户端不喜欢base64编码图像。
Full Story
全文
The very first thing I did was view "Show Original" in Gmail. To my surprise, raw content still has your embedded image data:
我做的第一件事就是在 Gmail 中查看“显示原件”。令我惊讶的是，原始内容仍然包含您嵌入的图像数据：
That tells me right away that gmail is simply choosing to filter this content out. I was not able to find the reason. Some guesses point out the length of encoded data itself. Others talk about the general way in which Gmail filters out images. There are even records of this technique functioning a number of years back.
这立即告诉我，gmail 只是选择过滤掉这些内容。我无法找到原因。一些猜测指出了编码数据本身的长度。其他人则谈论Gmail 过滤图像的一般方式。甚至有这种技术在几年前发挥作用的记录。
In addition, when viewing the same exact email in a third party client such as Newton(formerly Cloud Magic), I do see images properly rendered.
此外，在第三方客户端（如 Newton（以前称为 Cloud Magic））中查看完全相同的电子邮件时，我确实看到了正确呈现的图像。
All of that points to a simple, however sad, fact that gmail doesn't like inline encoded images. Not in the browser and not in their mobile apps.
所有这些都指向一个简单但可悲的事实，即 gmail 不喜欢内联编码的图像。不在浏览器中，也不在他们的移动应用程序中。
In fact, at the very end I did discover a post from 2013 by Campaign Monitor blogthat concludes with the same results.
事实上，最后我确实发现了Campaign Monitor 博客 2013 年的一篇文章，其结论与此相同。
Don't use inline embedded images.
不要使用内嵌嵌入图像。
