Sending email is very important in many web applications and most web technologies provides built-in classes for that. Microsoft.NET comes with a built-in class named SmtpClient just for that. Although sending email is very easy, because of the nature of communication the difficult part is to know whether the email is successfully delivered and read by the recipient. There are different approaches available to know the delivery status of the email but nothing solves the problem 100%.

In this article I’m going to discuss about the two important ways that are frequently used to know the delivery status of email, one is using read-receipts and the other one is appending an image-tag with the email body.

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