Process Bounced Email (Non-Delivery Report) and Email Tracking

For many email campaign applications, the very important task is detecting if the email is received by recipient or not. Parsing the delivery report is the common way to get the email status. It is strongly recommend that you remove the invalid or non-existent recipient from your mail listing to save networking resource.

SMTP Transport Error and Failure Report (NDS)

When you are sending an email to a recipient by EASendMail:

SMTP Transport Error and Failure Report are supported by all SMTP servers, so we strongly recommend that you catch SMTP Transport Error and parse Failure Report (NDS).

Delivery Receipt

It is also called a DSN (delivery service notification), which is a request to the recipient’s email server to send you a notification about the delivery of an email you've just sent. The notification takes the form of an email, and will tell you if your delivery succeeded (Delivery Receipt), failed, got delayed (Failure Report (NDS)).

Import Notice: Not every SMTP server support Delivery Receipt. Only the SMTP server that supports DSN extension command accepts Delivery Receipient request, otherwise you will get error when you are sending email.

The following example codes demonstrate how to request read receipt and delivery receipt:

[C#]
// The following example codes demonstrate requesting read receipt and delivery receipt
// To get full sample projects, please download and install EASendMail on your machine.
// To run it correctly, please change SMTP server, user, password, sender, recipient value to yours

using System;  
using System.Text; 
using EASendMail; 

void SendMail()
{
    try
    {
        SmtpMail oMail = new SmtpMail("TryIt");
        // Set sender email address, please change it to yours
        oMail.From = "test@emailarchitect.net";
        // Set recipient email address, please change it to yours
        oMail.To = "support@emailarchitect.net";

        // Set email subject
        oMail.Subject = "test email from c# project";
        // Set email body
        oMail.TextBody = "this is a test email sent from c# project, do not reply";

        // Request read receipt
        oMail.ReadReceipt = true;

        // Request both failure and success report
        oMail.DeliveryNotification = DeliveryNotificationOptions.OnFailure |
            DeliveryNotificationOptions.OnSuccess;

        // Your SMTP server address
        SmtpServer oServer = new SmtpServer("smtp.emailarchitect.net");

        // User and password for ESMTP authentication
        oServer.User = "test@emailarchitect.net";
        oServer.Password = "testpassword";

        // Most mordern SMTP servers require SSL/TLS connection now.
        // ConnectTryTLS means if server supports SSL/TLS, SSL/TLS will be used automatically.
        oServer.ConnectType = SmtpConnectType.ConnectTryTLS;

        SmtpClient oSmtp = new SmtpClient();
        oSmtp.SendMail(oServer, oMail);

        Console.WriteLine("email was sent successfully!");
    }
    catch (Exception ep)
    {
        Console.WriteLine("failed to send email {0}", ep.Message);
    }
}



[VB]
' The following example codes demonstrate requesting read receipt and delivery receipt
' To get full sample projects, please download and install EASendMail on your machine.
' To run it correctly, please change SMTP server, user, password, sender, recipient value to yours

Imports EASendMail 

Sub SendMail()

    Try
        Dim oMail As New SmtpMail("TryIt")

        ' Set sender email address, please change it to yours
        oMail.From = "test@emailarchitect.net"
        ' Set recipient email address, please change it to yours
        oMail.To = "support@emailarchitect.net"

        ' Set email subject
        oMail.Subject = "test email from VB.NET project"
        ' Set email body
        oMail.TextBody = "this is a test email sent from VB.NET project, do not reply"

        ' Your SMTP server address
        Dim oServer As New SmtpServer("smtp.emailarchitect.net")

        ' User and password for ESMTP authentication
        oServer.User = "test@emailarchitect.net"
        oServer.Password = "testpassword"

        ' Most mordern SMTP servers require SSL/TLS connection now.
        ' ConnectTryTLS means if server supports SSL/TLS, SSL/TLS will be used automatically.
        oServer.ConnectType = SmtpConnectType.ConnectTryTLS

        ' Request read receipt
        oMail.ReadReceipt = True

        ' Request both failure and success report
        oMail.DeliveryNotification = DeliveryNotificationOptions.OnFailure Or
        DeliveryNotificationOptions.OnSuccess

        Dim oSmtp As New SmtpClient()
        oSmtp.SendMail(oServer, oMail)

        Console.WriteLine("email was sent successfully!")
    Catch ep As Exception
        Console.WriteLine("failed to send email {0}", ep.Message)
    End Try

End Sub

Email Tracking

Email tracking is used to verify that emails are actually read by recipients. There are two common solutions:

Test Email Address

See Also

Using EASendMail SMTP .NET Component
User Authentication and SSL Connection
Enable TLS 1.2 on Windows XP/2003/2008/7/2008 R2
Using Gmail SMTP OAUTH
Using Gmail/GSuite Service Account + SMTP OAUTH Authentication
Using Office365 EWS OAUTH
Using Office365 EWS OAUTH in Background Service
Using Hotmail SMTP OAUTH
From, ReplyTo, Sender and Return-Path
Digital Signature and E-mail Encryption
DomainKeys and DKIM Signature
Send E-mail Directly (Simulating SMTP server)
Work with EASendMail Service (Email Queuing)
Bulk Email Sender Guidelines
EASendMail .NET Namespace References
EASendMail SMTP Component Samples