Many email clients such as outlook has a feature that allows you to request a receipt when your email is read by the recipient(s).

It can be achieved in generated emails using additional header called Disposition-Notification-To

Here is simple code

MailMessage email = new MailMessage(fromAddress, toAddress);
email.Headers.Add("Disposition-Notification-To", receiptToEmailAddress); //Use email address on which you want receive the receipt
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