Question

I am using C#.Net to send out a HTML email which contains embedded images. These emails work fine in Firefox and chrome but the images do not show up in Internet Explorer (IE). I know that the IE settings are not causing the problem since embedded images sent using Blat work just fine. Am I missing some option such as character set which is causing this problem? My code is as follows

 MailMessage msg = new MailMessage();
 MailAddress from = new MailAddress("Myemail@MyDomain", "My Name");
 msg.To.Add("Myemail@MyDomain");
 msg.From = from;
 msg.Subject = "My subjecct line";

 AlternateView htmlView = AlternateView.CreateAlternateViewFromString("This is a sample JPG embedded image<br><img src=\"cid:image1.jpg\">", null, "text/html");

 LinkedResource EmbeddedObjects1 = new LinkedResource("PathToImage\\image1.jpg");
 EmbeddedObjects1.ContentId = "image1.jpg";
 htmlView.LinkedResources.Add(EmbeddedObjects1);

msg.AlternateViews.Add(htmlView);
SmtpClient smtpclient = new SmtpClient("mailhost.domain.com", PortNumber);
smtpclient.Send(msg);

Answer 1

Maybe it helps if you create the LinkedResource with a ContentType combined with Coding Gorilla’s idea of a guid as the content-id:

Guid contentId = Guid.NewGuid().ToString();

AlternateView htmlView = AlternateView.CreateAlternateViewFromString(
  "This is a sample JPG embedded image<br><img src=\"cid:" + contentId + "\">", 
  null, "text/html");

ContentType ct = new ContentType(MediaTypeNames.Image.Jpeg);

LinkedResource EmbeddedObjects1 = new LinkedResource("PathToImage\\image1.jpg", ct);
EmbeddedObjects1.ContentId = contentId;
htmlView.LinkedResources.Add(EmbeddedObjects1);