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static void ReadReceipts()
{
//create the mail message
MailMessage mail = new MailMessage();
//set the addresses
mail.From = new MailAddress("me@mycompany.com");
mail.To.Add("you@yourcompany.com");
//set the content
mail.Subject = "This is an email";
mail.Body = "this is the body content of the email.";
//To request a read receipt, we need add a custom header named 'Disposition-Notification-To'
//in this example, read receipts will go back to 'someaddress@mydomain.com'
//it's important to note that read receipts will only be sent by those mail clients that
//a) support them
//and
//b)have them enabled.
mail.Headers.Add("Disposition-Notification-To", "<someaddress@mydomain.com>");
//send the message
SmtpClient smtp = new SmtpClient("127.0.0.1");
smtp.Send(mail);
}