Why Are My Inline Email Images Showing as Red Xs, and How Can I Fix It?

Troubleshooting Inline Images in Emails

Embedding images directly into your email body enhances readability, but sometimes these images appear as red Xs. This guide provides a solution.

Here's a corrected code example for embedding images:

<code class="language-csharp">MailMessage mailWithImg = GetMailWithImg();
MySMTPClient.Send(mailWithImg); // Ensure your SMTPClient is properly configured.

private MailMessage GetMailWithImg()
{
    MailMessage mail = new MailMessage();
    mail.IsBodyHtml = true;
    mail.AlternateViews.Add(GetEmbeddedImage("c:/image.png"));
    mail.From = new MailAddress("yourAddress@yourDomain");
    mail.To.Add("recipient@hisDomain");
    mail.Subject = "yourSubject";
    return mail;
}

private AlternateView GetEmbeddedImage(string filePath)
{
    LinkedResource res = new LinkedResource(filePath);
    res.ContentId = Guid.NewGuid().ToString();
    string htmlBody = $"<img src=\"cid:{res.ContentId}\"></img>"; // Note the escaped quotes
    AlternateView alternateView = AlternateView.CreateAlternateViewFromString(htmlBody, null, MediaTypeNames.Text.Html);
    alternateView.LinkedResources.Add(res);
    return alternateView;
}</code>

This improved code uses AlternateViews to embed the image within the HTML email. A unique ContentId is assigned to the LinkedResource, referenced in the HTML's img tag's src attribute. The AlternateView ensures compatibility across different email clients. This approach reliably embeds images, preventing the red X issue. Remember to replace "c:/image.png", "yourAddress@yourDomain", and "recipient@hisDomain" with your actual file path and email addresses.

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