Visual C++ - Parse failure delivery report (NDS)¶

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¶

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).

Parse report¶

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. EAGetMail .NET class provides a built-in function (GetReport) to parse the report. The following sample demonstrates how to parse the delivery-report.

If ReporType is DeliveryReceipt or ReadReceipt, the report probably has only OriginalSender, OriginalRecipient and OriginalMessageID information in the report, it depends on the mail server that generated the report.

Installation¶

Before you can use the following sample codes, you should download the EAGetMail Installer and install it on your machine at first. Full sample projects are included in this installer.

Add reference¶

To better demonstrate how to retrieve email and parse email, let’s create a Visual C++ console project named “receiveemail” at first, and then add the reference of EAGetMail in your project.

To use EAGetMail POP3 & IMAP4 ActiveX Object in your project, the first step is “Add header files of EAGetMail to your project”. Please go to C:\Program Files\EAGetMail\Include\tlh or C:\Program Files (x86)\EAGetMail\Include\tlh folder, find eagetmailobj.tlh and eagetmailobj.tli, and then copy these files to your project folder. You can start to use it to retrieve email and parse email in your project.

Visual C++ - Parse failure delivery report (NDS) - example¶

The following example codes demonstrate parsing failure delivery report. In order to run it correctly, please change email server, user, password, folder, file name value to yours.

#include "stdafx.h"
#include <windows.h>

#include "eagetmailobj.tlh"
using namespace EAGetMailObjLib;

void ParseReport(LPCTSTR lpszEmlFile)
{
    const int FailureReport = 0;
    const int DeliveryReceipt = 1;
    const int ReadReceipt = 2;
    const int Receipt_Deleted = 3;
    const int DelayedReport = 4;

    IMailPtr oMail;
    oMail.CreateInstance(__uuidof(EAGetMailObjLib::Mail));
    oMail->LicenseCode = _T("TryIt");
    oMail->LoadFile(lpszEmlFile, VARIANT_FALSE);

    if(oMail->IsReport == VARIANT_FALSE)
    {
        _tprintf(_T("This is not a report"));
        return;
    }

    // get report type
    IMailReportPtr oReport = oMail->GetReport();
    switch(oReport->ReportType)
    {
    case DeliveryReceipt:
        _tprintf(_T("This is a delivery receipt\r\n"));
        break;
    case ReadReceipt:
        _tprintf(_T("This is a read receipt\r\n"));
        break;
    case Receipt_Deleted:
        _tprintf(_T("This is a unread receipt, this email was deleted without read!\r\n"));
        break;
    case DelayedReport:
        _tprintf(_T("This is a delayed report, this email will be tried later by server automatically!\r\n"));
        break;
    default:
        _tprintf(_T("This is a failure delivery report\r\n"));
        break;

    }

    // get original message information
    _tprintf(_T("OriginalSender: %s\r\n"), (TCHAR*)oReport->OriginalSender);
    _tprintf(_T("OriginalRecipient: %s\r\n"), (TCHAR*)oReport->OriginalRecipient);
    _tprintf(_T("OriginalMessageID: %s\r\n"),(TCHAR*)oReport->OriginalMessageID);

    if(oReport->ReportType == FailureReport || oReport->ReportType == DelayedReport)
    {
        _tprintf(_T("ErrCode: %s\r\n"), (const TCHAR*)oReport->ErrCode);
        _tprintf(_T("ErrDescription: %s\r\n"), (const TCHAR*)oReport->ErrDescription);
        _tprintf(_T("OriginalSubject: %s\r\n"), (const TCHAR*)oReport->OriginalSubject);
        _tprintf(_T("ReportMTA: %s\r\n"), (const TCHAR*)oReport->ReportMTA);

        IHeaderCollectionPtr oHeaders;
        oHeaders = oReport->OriginalHeaders;
        int count = oHeaders->Count;
        for(int i = 0; i < count; i++)
        {
            IHeaderItemPtr oHeader;
            oHeader = oHeaders->Item(i);
            ::_tprintf(_T("%s: %s\r\n"),
                (TCHAR*)oHeader->HeaderKey, (TCHAR*)oHeader->HeaderValue);
        }
    }
}

int _tmain(int argc, _TCHAR* argv[])
{
    // Initialize COM environment
    ::CoInitialize(NULL);

    try
    {
        ParseReport(_T("c:\\my folder\\test.eml"));
    }
    catch (_com_error &exp)
    {
        _tprintf(_T("%s\r\n"), (TCHAR*)exp.Description());
    }

    return 0;
}

32bit/x64 ActiveX DLL¶

Seperate builds of run-time dll for 32 and x64 platform

Distribution¶

• Standard EXE

  For VB6, C++, Delphi or other standard exe application, you can distribute EAGetMailObj.dll with your application to target machine without COM-registration and installer. To learn more detail, please have a look at Registration-free COM with Manifest File.

• Script

  For ASP, VBScript, VBA, MS SQL Stored Procedure, you need to install EAGetMail on target machine by EAGetMail installer, both 32bit/x64 DLL are installed and registered.