Delphi - Parse Failure Delivery Report (NDS)

The following delphi example codes demonstrate how to parse failure delivery report.

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 use EAGetMail ActiveX Object in your Delphi project, the first step is “Add Unit file of EAGetMail to your project”. Please go to C:\Program Files\EAGetMail\Samples_Delphi\pop3_imap4_simple.delphi or C:\Program Files (x86)\EAGetMail\Samples_Delphi\pop3_imap4_simple.delphi folder, find EAGetMailObjLib_TLB.pas, and then copy this file to your project folder.

// include EAGetMailObjLib_TLB unit to your Delphi Project
unit Unit1;

interface

uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, EAGetMailObjLib_TLB, StdCtrls;

Then you can start to use it in your Delphi Project.

You can also create EAGetMailObjLib_TLB.pas manually by Delphi like this:

  • Delphi 7 or eariler version

    First of all, create a standard delphi project: select menu Project -> Import Type Library, checked EAGetMail ActiveX Object and click Create Unit. Then include EAGetMailObjLib_TLB in your project.

    add reference in Delphi
  • Delphi XE or later version

    First of all, create a standard delphi project: select menu Component -> Import component... -> Import a type library -> checked EAGetMail ActiveX Object, have Generate Component Wrapper checked and click “Create Unit”. Then include EAGetMailObjLib_TLB in your project.

Delphi - 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.

Note

To get full sample projects, please download and install EAGetMail on your machine.

Unit Unit1;

Interface

Uses
    Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
    Dialogs, StdCtrls, EAGetMailObjLib_TLB;

Type
    TForm1 = Class(TForm)
        Button1: TButton;
        Procedure Button1Click(Sender: TObject);
    private
        { Private declarations }
    public
        { Public declarations }
    End;

Const
    MailServerPop3 = 0;
    MailServerImap4 = 1;
    FailureReport = 0;
    DeliveryReceipt = 1;
    ReadReceipt = 2;

Var
    Form1: TForm1;

Implementation

{$R *.dfm}

Procedure TForm1.ParseReport(fileName: WideString);
Var
    oMail: TMail;
    oReport: IMailReport;
    oHeaders: IHeaderCollection;
    i, count: Integer;
Begin
    oMail := TMail.Create(Application);
    oMail.LicenseCode := 'TryIt';

    oMail.LoadFile(fileName, false);

    If Not oMail.IsReport Then
    Begin
        ShowMessage('This is not a report!');
        exit;
    End;

    oReport := oMail.GetReport();
    If oReport.ReportType = DeliveryReceipt Then
        ShowMessage('This is a deliver receipt!')
    Else If oReport.ReportType = ReadReceipt Then
        ShowMessage('This is a read receipt!')
    Else
        ShowMessage('This is a failure report!');

    // Get original message information
    ShowMessage(oReport.OriginalSender);
    ShowMessage(oReport.OriginalRecipient);
    ShowMessage(oReport.OriginalMessageID);

    If oReport.ReportType = FailureReport Then
    Begin
        ShowMessage(oReport.ErrCode);
        ShowMessage(oReport.ErrDescription);
        ShowMessage(oReport.OriginalSubject);
        ShowMessage(oReport.ReportMTA);
        oHeaders := oReport.OriginalHeaders;
        // Parse original email headers.
        count := oHeaders.Count;
        For i := 0 To count-1 Do
        Begin
            ShowMessage(oHeaders.Item(i).HeaderKey + ':' +
                oHeaders.Item(i).HeaderValue);
        End;
    End;
End;

Procedure TForm1.Button1Click(Sender: TObject);
Begin
    Try
        ParseReport('c:\my folder\test.eml');
    Except
        On ep:Exception Do
        ShowMessage('Error: ' + ep.Message);
    End;

End;

End.

32bit/x64 ActiveX DLL

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

File Platform
Installation Path\EAGetMailObj.dll 32 bit
Installation Path\x64\EAGetMailObj.dll 64 bit

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.

Appendix

Comments

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