How to check mail opened or not in c asp.net

In ASP.NET, you can't directly check if an email has been opened or not, as this information is not stored on the server-side. However, you can use various techniques to track email opens and clicks:

Image tracking: This method involves adding a 1x1 pixel image to your email template. When the recipient opens the email, the image is loaded, and you can track the open. You can use a URL like https://example.com/opened?email_id=123 to track the open.
JavaScript tracking: You can use JavaScript to track email opens. When the recipient opens the email, the JavaScript code is executed, and you can send a request to your server to track the open.
Server-side tracking: You can use a third-party service like Mailgun or Sendgrid, which provides APIs to track email opens and clicks.

Here's an example of how you can implement image tracking in ASP.NET:

Step 1: Create a new ASP.NET Web Forms project or add a new Web Form to your existing project.

Step 2: Add a new image to your email template (e.g., open.gif).

Step 3: In your email template, add the following code:

<img src="https://example.com/opened?email_id=123" alt="" />

Replace https://example.com/opened?email_id=123 with your own tracking URL.

Step 4: In your ASP.NET project, create a new Web Form (e.g., OpenTracker.aspx) to handle the tracking request.

Step 5: In OpenTracker.aspx, add the following code:

protected void Page_Load(object sender, EventArgs e)
{
    string emailId = Request.QueryString["email_id"];
    // Update your database or tracking system with the email ID
    // For example:
    // Database.UpdateEmailStatus(emailId, "opened");
}

Step 6: Configure your email service (e.g., SMTP) to use the OpenTracker.aspx page as the tracking URL.

When a recipient opens the email, the image is loaded, and the tracking URL is requested. The OpenTracker.aspx page will be executed, and you can update your database or tracking system with the email ID.

Keep in mind that this is a basic example, and you should consider implementing additional security measures, such as validating the email ID and preventing abuse.

For JavaScript tracking, you can use libraries like jQuery to send a request to your server when the email is opened.

For server-side tracking, you can use APIs provided by third-party services like Mailgun or Sendgrid to track email opens and clicks.

Remember to check the terms of service and any applicable laws regarding email tracking and privacy.

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How to check mail opened or not in c asp.net