(VB.NET) Transition from Email.GetDsnFinalRecipients to Email.GetDsnInfo

Provides instructions for replacing deprecated GetDsnFinalRecipients method calls with GetDsnInfo.

Note: This example requires Chilkat v11.0.0 or greater.

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Dim email As New Chilkat.Email


' Load a multipart/report DSN email.
Dim success As Boolean = email.LoadEml("qa_data/eml/dsn_example.eml")
If (success = False) Then
    Debug.WriteLine(email.LastErrorText)
    Exit Sub
End If


' ------------------------------------------------------------------------
' The GetDsnFinalRecipients method is deprecated:

Dim sa As Chilkat.StringArray = email.GetDsnFinalRecipients()
If (email.LastMethodSuccess = False) Then
    Debug.WriteLine(email.LastErrorText)
    Exit Sub
End If



Dim i As Integer = 0
Dim count As Integer = sa.Count
While i < count
    Debug.WriteLine(i & ": " & sa.GetString(i))
    i = i + 1
End While
Debug.WriteLine("----")



' ------------------------------------------------------------------------
' Do the equivalent using GetDsnInfo.
' Your application creates a new, empty JsonObject object which is passed 
' in the last argument and filled upon success.

Dim json As New Chilkat.JsonObject
success = email.GetDsnInfo(json)
If (success = False) Then
    Debug.WriteLine(email.LastErrorText)
    Exit Sub
End If


json.EmitCompact = False
Debug.WriteLine(json.Emit())
Debug.WriteLine("----")

' The JSON contains the following:

' {
'   "reporting-mta": "dns; mail.example.com",
'   "received-from-mta": "dns; smtp.example.com",
'   "arrival-date": "Fri, 8 May 2025 14:23:42 -0400",
'   "final-recipient": [
'     "rfc822; alice@example.com",
'     "rfc822; bob@example.com",
'     "rfc822; carol@example.com"
'   ],
'   "action": "failed",
'   "status": "5.1.1",
'   "remote-mta": "dns; smtp.recipientdomain.com",
'   "diagnostic-code": "smtp; 550 5.1.1 User unknown",
'   "last-attempt-date": "Fri, 8 May 2025 14:23:42 -0400",
'   "action": "failed",
'   "status": "5.1.2",
'   "remote-mta": "dns; smtp.recipientdomain.com",
'   "diagnostic-code": "smtp; 550 5.1.2 Host unknown (Domain name not found)",
'   "last-attempt-date": "Fri, 8 May 2025 14:23:42 -0400",
'   "action": "failed",
'   "status": "5.7.1",
'   "remote-mta": "dns; smtp.recipientdomain.com",
'   "diagnostic-code": "smtp; 550 5.7.1 Relay access denied",
'   "last-attempt-date": "Fri, 8 May 2025 14:23:42 -0400"
' }

' Iterate over the final-recipients
i = 0
count = json.SizeOfArray("final-recipient")
While i < count
    json.I = i
    Dim recipient As String = json.StringOf("final-recipient[i]")
    Debug.WriteLine(i & ": " & recipient)

    i = i + 1
End While

' -------------------------------------------------------------------------------------------
' -------------------------------------------------------------------------------------------
' This is the contents of the dsn_example.eml used for this example:

' From: postmaster@example.com
' To: sender@example.com
' Subject: Delivery Status Notification (Failure)
' MIME-Version: 1.0
' Content-Type: multipart/report; report-type=delivery-status;
'     boundary="boundary-string"
' 
' --boundary-string
' Content-Type: text/plain; charset=us-ascii
' 
' This is an automatically generated Delivery Status Notification.
' 
' Delivery to the following recipients failed permanently:
' 
'     alice@example.com
'     bob@example.com
'     carol@example.com
' 
' Technical details of permanent failure:
' DNS Error: Domain name not found
' 
' --boundary-string
' Content-Type: message/delivery-status
' 
' Reporting-MTA: dns; mail.example.com
' Received-From-MTA: dns; smtp.example.com
' Arrival-Date: Fri, 8 May 2025 14:23:42 -0400
' 
' Final-Recipient: rfc822; alice@example.com
' Action: failed
' Status: 5.1.1
' Remote-MTA: dns; smtp.recipientdomain.com
' Diagnostic-Code: smtp; 550 5.1.1 User unknown
' Last-Attempt-Date: Fri, 8 May 2025 14:23:42 -0400
' 
' Final-Recipient: rfc822; bob@example.com
' Action: failed
' Status: 5.1.2
' Remote-MTA: dns; smtp.recipientdomain.com
' Diagnostic-Code: smtp; 550 5.1.2 Host unknown (Domain name not found)
' Last-Attempt-Date: Fri, 8 May 2025 14:23:42 -0400
' 
' Final-Recipient: rfc822; carol@example.com
' Action: failed
' Status: 5.7.1
' Remote-MTA: dns; smtp.recipientdomain.com
' Diagnostic-Code: smtp; 550 5.7.1 Relay access denied
' Last-Attempt-Date: Fri, 8 May 2025 14:23:42 -0400
' 
' --boundary-string
' Content-Type: message/rfc822
' 
' Return-Path: <sender@example.com>
' Received: from smtp.example.com (smtp.example.com [192.168.1.10])
'     by mail.example.com (Postfix) with ESMTP id 123456789
'     for <alice@example.com>, <bob@example.com>, <carol@example.com>;
'     Fri, 8 May 2025 14:23:42 -0400
' Message-ID: <001a113d789f$ad34bc30$038e34b0$@example.com>
' From: Sender Name <sender@example.com>
' To: alice@example.com, bob@example.com, carol@example.com
' Subject: Test Message
' Date: Fri, 8 May 2025 14:20:00 -0400
' Content-Type: text/plain; charset="us-ascii"
' 
' This is a test email message sent to multiple recipients.
' --boundary-string--
'