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Visual Basic.NET - 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.

The following example codes demonstrate how to parse failure delivery report

Installation

Before you can use the following sample codes, you should download the EAGetMail Installer and install it on your machine at first.

Add Reference of EAGetMail to Visual Basic.NET Project

To use EAGetMail POP3 & IMAP Component in your project, the first step is "Add reference of EAGetMail to your project". Please create/open your project with Visual Studio.NET, then choose menu->"Project"->"Add Reference"->".NET"->"Browse...", and choose the EAGetMail{version}.dll from your disk, click "Open"->"OK", the reference of EAGetMail will be added to your project, and you can start to use EAGetMail to retrieve email and parse email in your project.

add reference in vb.net

Because EAGetMail 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 1.1, 2.0, 3.5, 4.0 and .Net Compact Framework 2.0, 3.5.

File	.NET Framework Version
EAGetMail.dll	Built with .NET Framework 1.1 It requires .NET Framework 1.1, 2.0, 3.5 or later version.
EAGetMail20.dll	Built with .NET Framework 2.0 It requires .NET Framework 2.0, 3.5 or later version.
EAGetMail35.dll	Built with .NET Framework 3.5 It requires .NET Framework 3.5 or later version.
EAGetMail40.dll	Built with .NET Framework 4.0 It requires .NET Framework 4.0 or later version.
EAGetMailCF20.dll	Built with .NET Compact Framework 2.0 It requires .NET Compact Framework 2.0, 3.5 or later version.
EAGetMailCF35.dll	Built with .NET Compact Framework 3.5 It requires .NET Compact Framework 3.5 or later version.

' The following example codes demonstrate parsing failure delivery report
' To get full sample projects, please download and install EAGetMail on your machine.
' To run it correctly, please change email server, user, password, folder, file name value to yours

Imports System.Collections
Imports System.Text
Imports System.IO

' Imports EAGetMail namespace
Imports EAGetMail

Module Module1
    Private Sub ParseReport(ByVal emlFile As String)
        Dim oMail As New Mail("TryIt")
        oMail.Load(emlFile, False)

        If Not oMail.IsReport Then
            Console.WriteLine("This is not a delivery report.")
            Return
        End If

        Dim oReport As MailReport = oMail.GetReport()
        Select Case oReport.ReportType
            Case DeliveryReportType.DeliveryReceipt
                Console.WriteLine("This is a delivery receipt!")
                Exit Select
            Case DeliveryReportType.ReadReceipt
                Console.WriteLine("This is a read receipt!")
                Exit Select
            Case Else
                Console.WriteLine("This is a failure report!")
                Exit Select
        End Select

        Console.WriteLine("OriginalSender: {0}", oReport.OriginalSender)
        Console.WriteLine("OriginalRecipient: {0}", oReport.OriginalRecipient)
        Console.WriteLine("OriginalMessageID: {0}", oReport.OriginalMessageID)

        If oReport.ReportType = DeliveryReportType.FailureReport Then
            Console.WriteLine("ErrCode: {0}", oReport.ErrCode)
            Console.WriteLine("ErrDescription: {0}", oReport.ErrDescription)
            Console.WriteLine("OriginalSubject: {0}", oReport.OriginalSubject)
            Console.WriteLine("ReportMTA: {0}", oReport.ReportMTA)
            Console.WriteLine(oReport.OriginalHeaders.ToString())
        End If
    End Sub

    Sub Main()

        ParseReport("c:\my folder\test.eml")

    End Sub
End Module

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Visual Basic.NET - Parse Failure Delivery Report (NDS)

Read Receipt

Delivery Receipt and Failure Report

Parse Report

VB.NET Email Examples

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