Send email with image embedded - image not visible

Question

I send an email with a C# library. The email body contains a logo. When I send this email via GMail's SMTP server, the image is visible. When I use our domain name [email protected], the image is not visible.

Does anyone have an idea about this difference?

Answer 1

In order for this to work you need to send an HTML document and then embed the image using mime.

The ASP.NET smtp object does most of the dirty work for you since v2.0.

Here is an example from a microsoft site. original location

  //Holds message information.
  System.Net.Mail.MailMessage mailMessage = new System.Net.Mail.MailMessage();
  //Add basic information.
  mailMessage.From = new System.Net.Mail.MailAddress(txtFrom.Text.Trim());
  mailMessage.To.Add(txtTo.Text.Trim());

  mailMessage.Subject = txtSubject.Text.Trim();
  //Create two views, one text, one HTML.
  System.Net.Mail.AlternateView plainTextView = System.Net.Mail.AlternateView.CreateAlternateViewFromString(txtBody.Text.Trim(), null, "text/plain");
  System.Net.Mail.AlternateView htmlView = System.Net.Mail.AlternateView.CreateAlternateViewFromString(txtBody.Text.Trim() + "<image src=cid:HDIImage>", null, "text/html");
  //Add image to HTML version
  System.Net.Mail.LinkedResource imageResource = new System.Net.Mail.LinkedResource(fileImage.PostedFile.FileName, "image/jpg");
  imageResource.ContentId = "HDIImage";
  htmlView.LinkedResources.Add(imageResource);
  //Add two views to message.
  mailMessage.AlternateViews.Add(plainTextView);
  mailMessage.AlternateViews.Add(htmlView);
  //Send message
  System.Net.Mail.SmtpClient smtpClient = new System.Net.Mail.SmtpClient();
  smtpClient.Send(mailMessage);

Answer 2

You want to embed the image in mail message. and MailMessage Body type should be html

try

        {

            MailMessage mail = new MailMessage();

            mail.To.Add("[email protected]");

            mail.From = new MailAddress("[email protected]");

            mail.Subject = "Test with Image";

            string Body = "<b>Welcome</b><br><BR>Online resource for .net articles.<BR><img alt=\"\" hspace=0 src=\"cid:imageId\" align=baseline border=0 >";



            AlternateView htmlView = AlternateView.CreateAlternateViewFromString(Body, null, "text/html");

            LinkedResource imagelink = new LinkedResource(Server.MapPath(".") + @"\codedigest.png", "image/png");

            imagelink.ContentId = "imageId";

            imagelink.TransferEncoding = System.Net.Mime.TransferEncoding.Base64;

            htmlView.LinkedResources.Add(imagelink);

            mail.AlternateViews.Add(htmlView);

            SmtpClient smtp = new SmtpClient();

            smtp.DeliveryMethod = SmtpDeliveryMethod.PickupDirectoryFromIis;

            smtp.Send(mail);

        }

        catch (Exception ex)

        {

            Response.Write(ex.Message);

        }

Answer 3

if (!string.IsNullOrEmpty(BodyImageFileFullName))
        {
            var leftImageLink = new LinkedResource(BodyImageFileFullName, "image/jpg")
            {
                ContentId = "ImageGM_left",
                TransferEncoding = TransferEncoding.Base64
            };
            htmlView.LinkedResources.Add(leftImageLink);
        }

You can look this solution. I solve my problem with this code. detailed code about sending mail with image linked in body.

http://www.softcodearticle.com/2012/11/sending-mail-with-image-using-smtp-in-c/

Answer 4

The following code has solved my problem:

//Holds message information.

System.Net.Mail.MailMessage mailMessage = new System.Net.Mail.MailMessage();

//Add basic information.

mailMessage.From = new System.Net.Mail.MailAddress(txtFrom.Text.Trim());
mailMessage.To.Add(txtTo.Text.Trim());
mailMessage.Subject = txtSubject.Text.Trim();

//Create two views, one text, one HTML.

System.Net.Mail.AlternateView plainTextView = System.Net.Mail.AlternateView.CreateAlternateViewFromString(txtBody.Text.Trim(), null, "text/plain");
System.Net.Mail.AlternateView htmlView = System.Net.Mail.AlternateView.CreateAlternateViewFromString(txtBody.Text.Trim() + "<image src=cid:HDIImage>", null, "text/html");

//Add image to HTML version

System.Net.Mail.LinkedResource imageResource = new System.Net.Mail.LinkedResource(fileImage.PostedFile.FileName);
imageResource.ContentId = "HDIImage";
htmlView.LinkedResources.Add(imageResource);

//Add two views to message.

mailMessage.AlternateViews.Add(plainTextView);
mailMessage.AlternateViews.Add(htmlView);

//Send message

System.Net.Mail.SmtpClient smtpClient = new System.Net.Mail.SmtpClient();
smtpClient.Send(mailMessage);

Answer 5

The receiving site, or mail agent, is using rules, based in part on the sender, to block images. You'll find that your results differ based on where you're sending to. What you can do about this depends on the receiver - you might contact them or review their posted policies to see what hoops you could jump through to avoid the block.