Sending inline attachments with ews

Question

I'm using EWS to send an email with inline attachement(s).

I'm use following code for it:

var attachment = attachments.AddFileAttachment(path);
attachment.ContentId = cid;
attachment.IsInline = true;
attachment.ContentType = "PNG/Image";

Html body of the message contains following fragment

<img src=""cid:{cid}""></img>

where {cid} is a value of cid field.

It works when I check emails with Outlook but in OWA image is not show in message body.

Please suggest me right way to send mail with inline image via EWS to view in OWA.

Answer 1

The below code works for me and I can see the inline attachment in Outlook/OWA/Mobile.

Steps:

1. HTML body with placeholders for contentids

2. Replace that placeholders with the actual attachment contentids

3. Create a new attachment and set the properties inline (true) and contentid (actual contentid for the associated attachment)

       string attachment = "c:\\inlineattachment.png";
   
       // Create an e-mail message using the ExchangeService.
       EmailMessage message = new EmailMessage(ExchangeServiceObject);
   
       // Subject
       message.Subject = "Email with inline attachments";
   
       // Message body with place holder for contentid
       message.Body = "Email body with inline attachment </br> <img src=\"cid:{0}\">";
       message.Body.BodyType = BodyType.HTML;
   
       // Replace the place holder with contentid
       // Random GUID is used to avoid name collision for contentids 
       string newGuid = Guid.NewGuid().ToString();
       message.Body = string.Format(message.Body, newGuid);
   
       // Create a new attachment and add necessary properties to make it inline
       message.Attachments.AddFileAttachment(attachment);
       message.Attachments[message.Attachments.Count - 1].IsInline = true;
       message.Attachments[message.Attachments.Count - 1].ContentId = newGuid;
   
       // Add recipeint
       message.ToRecipients.Add("recipient@domain.com");
   
       // Send the e-mail message and save a copy.
       message.SendAndSaveCopy();