The following Managed C++/CLI example codes demonstrate how to request read receipt and delivery receipt.
Read Receipt
Some e-mail applications, such as Microsoft Office Outlook, employ a read-receipt tracking mechanism. A sender selects the receipt request option prior to sending the message. Upon opening the email, each recipient has the option of notifying the sender that the message was opened and read.
However, there is no guarantee that you will get a read-receipt. Some possible reason are that very few e-mail applications or services support read receipts, or simply because users disable the functionality. Those do support read-receipt aren’t necessarily compatible with or capable of recognizing requests from a different e-mail service or application
Delivery Receipt and Failure Report (NDS)
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).
Sections:
Before you can use the following codes, please download EASendMail SMTP Component and install it on your machine at first. Full sample proejcts are included in this installer.
Install from NuGet
You can also install the run-time assembly by NuGet. Run the following command in the NuGet Package Manager Console:
Install-Package EASendMail
Note
If you install it by NuGet, no sample projects are installed, only .NET assembly is installed.
To use EASendMail SMTP Component in your project, the first step is Add reference
of EASendMail to your project
. Please create or open your project with Visual Studio,
then go to menu
-> Project
-> Add Reference
-> .NET
-> Browse...
, and select
Installation Path\Lib\net[version]\EASendMail.dll
from your disk, click Open
-> OK
, the reference of EASendMail
will be added to your project, and you can start to use it to send email
in your project.
Because EASendMail has separate builds for .Net Framework, please refer to the following table and choose the correct dll.
Separate builds of run-time assembly for .NET Framework 2.0, 3.5, 4.0, 4.5, 4.6.1, 4.7.2, 4.8.1, .NET 5.0, .NET 6.0, .NET 7.0, .NET 8.0, .NET Standard 2.0 and .NET Compact Framework 2.0, 3.5.
File | .NET Framework Version |
Lib\[net20|40|45|461|472|481]\EASendMail.dll |
Built with .NET Framework 2.0, 4.0, 4.5, 4.6.1, 4.7.2, 4.8.1
It requires .NET Framework 2.0, 3.5 or later version. |
Lib\[net5.0|6.0|7.0|8.0]\EASendMail.dll |
Built with .NET 5.0, .NET 6.0, .NET 7.0, .NET 8.0
It requires .NET 5.0 or later version. |
Lib\netstandard2.0\EASendMail.dll |
Built with .NET Standard 2.0
It requires .NET Standard 2.0 or later version. |
Lib\[net20-cf|net35-cf]\EASendMail.dll |
Built with .NET Compact Framework 2.0, 3.5
It requires .NET Compact Framework 2.0, 3.5 or later version. |
The following example codes demonstrate requesting read receipt and delivery receipt from an email.
In order to run it correctly, please change SMTP server
, user
, password
, sender
, recipient
value to yours.
Note
To get full sample projects, please download and install EASendMail on your machine.
#include "stdafx.h"
using namespace System;
using namespace EASendMail;
int main(array<System::String ^> ^args)
{
try
{
SmtpMail ^oMail = gcnew 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 = gcnew AddressCollection("support@emailarchitect.net");
// Set email subject
oMail->Subject = "test email from Managed C++/CLI, read receipt required";
// Set email body
oMail->TextBody = "this is a test email sent from Managed 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 = gcnew SmtpServer("smtp.emailarchitect.net");
// User and password for ESMTP authentication, if your server doesn't require
// User authentication, please remove the following codes.
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;
// If your SMTP server uses 587 port
// oServer->Port = 587;
// If your SMTP server requires SSL/TLS connection on 25/587/465 port
// oServer->Port = 25; // 25 or 587 or 465
// oServer->ConnectType = SmtpConnectType::ConnectSSLAuto;
Console::WriteLine("start to send email from Managed C++...");
SmtpClient ^oSmtp = gcnew SmtpClient();
oSmtp->SendMail(oServer, oMail);
Console::WriteLine("email was sent successfully!");
}
catch (Exception ^ep)
{
Console::WriteLine("failed to send email with the following error:");
Console::WriteLine(ep->Message);
}
return 0;
}
Appendix
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