是否可以像Outlook RTF/TNEF那样在html电子邮件中嵌入非图像附件？

Question

• 这似乎很难，而且
• 我的电子邮件内容是html格式的，所以我必须首先将RTF转换为html格式。

Answer 1

我决定不那么懒，自己试试...

答案是肯定的，您可以使用引用html电子邮件中的非图像附件。标记和Outlook将打开它们。我使用Outlook 2013作为我的电子邮件客户端，使用Office365作为我的服务器；里程数随客户机和服务器的不同而不同。但如果不使用Outlook就不会很好地工作...

Gmail

下面是我使用EWS进行测试的powershell。它发送一个html电子邮件

• 嵌入的图像（从不显示为“附件”）
• 使用标记链接到的.pdf文件，标记为内联。在Outlook中，它不会显示为附件，但可以从链接访问。在gmail和iOS邮件中，这都不显示为附件，无法从链接中访问。
• 与标记链接并标记为附件的.docx文件。在Outlook中，它显示为附件，也可以从链接访问。在gmail中，这是没有显示的，从链接上也不起作用。在iOS邮件中，它显示为附件，但无法从链接访问。
• 相同的.docx文件再次标记为附件，并且未与标记链接。这在Outlook、gmail、iOS邮件中都是可见的附件。

PowerShell：

$to1 = '[e-mail]'
$to2 = 'your-email@your-domaincom'
$subject = 'Test email with embedded attachments'
$body = '
This email shows embedded attachments. Yay. <br/><br/>
Here is an image: <img src="cid:[e-mail]" /><br/>
More amazingly, <a href="cid:[e-mail]">here</a> is a pdf.<br/>
And <a href="cid:[e-mail]">here</a> is a word doc!<br/><br/>
'
# fyi - the '@your-domain.com' in the id is optional but somewhere I read 
# that email clients might like it more if it's included. Doesn't need to 
# be a real domain.

# change these paths to something that exists
$image1Path = "C:\temp\an_image.jpg"
$attachment1Path = "C:\temp\some_file.pdf"
$attachment2Path = "C:\temp\some_doc.docx"

#prompt for Office365 creds
$Credential = Get-Credential

#Load the EWS Managed API Assembly - you need it installed first!!
Add-Type -Path 'C:\Program Files (x86)\Microsoft\Exchange\Web Services\2.1\Microsoft.Exchange.WebServices.dll'

#Instantiate the EWS service object                  
$service = New-Object Microsoft.Exchange.WebServices.Data.ExchangeService

#Set the credentials for Exchange Online
$service.Credentials = New-Object Microsoft.Exchange.WebServices.Data.WebCredentials -ArgumentList  $Credential.UserName, $Credential.GetNetworkCredential().Password

#Autodiscover doesn't seem to work for my office365; set it manually
$service.Url = 'https://outlook.office365.com/EWS/Exchange.asmx'
#This might work for you instead: 
# $service.AutodiscoverUrl($Credential.UserName, {$true})

#Create the email message and set the Subject and Body
$message = New-Object Microsoft.Exchange.WebServices.Data.EmailMessage -ArgumentList $service
$message.Subject = $subject
$message.Body = $body
$null = $message.ToRecipients.Add($to1)
$null = $message.ToRecipients.Add($to2)
$att = $message.Attachments.AddFileAttachment($image1Path)
$att.ContentId = '[e-mail]'
$att.IsInline=$true
$att = $message.Attachments.AddFileAttachment($attachment1Path)
$att.ContentId = '[e-mail]'
$att.IsInline=$true
$att = $message.Attachments.AddFileAttachment($attachment2Path)
$att.ContentId = '[e-mail]'
$att.IsInline=$false

# add the same attachment again with a different name to see if it's 
# rendered differently.
$att = $message.Attachments.AddFileAttachment('no_cid.docx', $attachment2Path)
$att.IsInline=$false

#Send the message and save a copy in the Sent Items folder
$message.SendAndSaveCopy()

null