Sample code for 30+ languages & platforms
Visual Basic 6.0

Create DSN (Delivery Status Notification) Email

Demonstrates how to create a DSN (Delivery Status Notification) Email having the format as defined in RFC 3464.

Chilkat Visual Basic 6.0 Downloads

Download Chilkat for Visual Basic 6.0
Visual Basic 6.0 
Dim success As Long
success = 0

Dim email As New ChilkatEmail

'  A DSN email is a report about the attempt to delivery 
'  an email.  It is usually a report that indicates failure or
'  or a delay in delivery.  The DSN is typically sent back to
'  the sender of an email.

'  IMPORTANT:
'  Note: Please be careful in sending automated DSN's.
'  It is important to be aware of an issue called "backscatter".
'  See the Wikipedia article here:  http://en.wikipedia.org/wiki/Backscatter_%28e-mail%29

'  The ToDsn method will be called to create a new
'  DSN email based upon the email object calling ToDsn.
'  The email object instance used to call ToDsn would
'  typically be an email received from a POP3 or IMAP server.
'  In this case, to simplify the example, we'll load the email
'  from a .eml file.

'  This example will be creating a DSN for "someEmail.eml"
success = email.LoadEml("someEmail.eml")
If (success = 0) Then
    Debug.Print email.LastErrorText
    Exit Sub
End If

'  The DSN created by ToDsn will contain a 
'  "message/delivery-status" MIME sub-part that will
'  be composed of a number of name-value pairs.
'  See RFC 3464 ( http://tools.ietf.org/html/rfc3464 )
'  The name-value content for this part is passed
'  as XML to ToDsn. This part of the example
'  prepares the XML:
Dim xml As New ChilkatXml

'  For this example, we're just adding a few name-value pairs.
'  These should not be considered to be correct, required or
'  even sensible -- it's simply for the example.  
xml.Tag = "DeliveryStatusFields"
xml.NewChild2 "Status","5.1.2 (bad destination system: no such domain)"
xml.NewChild2 "Diagnostic-Code","smtp; Permanent failure: no such domain"
xml.NewChild2 "X-BounceCategory","bad-domain"

Dim xmlStr As String
xmlStr = xml.GetXml()

'  The last argument to be passed to ToDsn will be a boolean
'  indicating whether to include the entire MIME of the calling
'  email object in the DSN, or only the header.
'  It may make sense to include the entire email for small emails,
'  but for large emails (with large attachments) it's probably
'  best to make the DSN header-only.
Dim bHeaderOnly As Long
bHeaderOnly = 1

'  The first argument to be passed to ToDsn will
'  be a human-readable explanation that will be placed
'  into the 1st MIME part of the DSN (see RFC 3464).
Dim humanReadableExplanation As String
humanReadableExplanation = "Blah blah blah. The delivery of this email failed. Blah blah blah"

'  OK, we're ready to create DSN....
Dim dsnEmail As New ChilkatEmail

success = email.ToDsn(humanReadableExplanation,xmlStr,bHeaderOnly,dsnEmail)
If (success = 0) Then
    Debug.Print email.LastErrorText
    Exit Sub
End If

'  Show the MIME of the source (original) email:
Debug.Print email.GetMime()

Debug.Print "**************************************"

'  Show the MIME of the DSN email:
Debug.Print dsnEmail.GetMime()

'  Sample output showing the MIME of the original email,
'  and the DSN email created based upon it:

'  X-Account-Key: account2
'  X-UIDL: 0D154945439D42BD80F180F6D9DE4D82
'  Received: with MailEnable Postoffice Connector;
'  	 Tue, 21 Jun 2011 09:21:23 -0400
'  Received: from qmta14.emeryville.ca.mail.comcast.net ([76.96.227.212]) by chilkatsoft.com with MailEnable ESMTP;
'  	 Tue, 21 Jun 2011 09:21:22 -0400
'  Received: from omta03.emeryville.ca.mail.comcast.net ([76.196.30.27]) by qmta14.emeryville.ca.mail.comcast.net with comcast id yd4k1g0050b6N64AEdLW9x;
'  	 Tue, 21 Jun 2011 13:20:30 +0000
'  Received: from [127.0.0.1] ([67.175.202.103]) by omta03.emeryville.ca.mail.comcast.net with comcast id ydLV1g00n2EMkZ78PdLWxi;
'  	 Tue, 21 Jun 2011 13:20:31 +0000
'  Message-ID: <4E009AA4.3090205@chilkatsoft.com>
'  Date: Tue, 21 Jun 2011 08:20:36 -0500
'  From: Chilkat Software <admin@chilkatsoft.com>
'  User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.17) Gecko/20110414 Thunderbird/3.1.10
'  MIME-Version: 1.0
'  To: Chilkat Support <support@chilkatsoft.com>
'  Subject: test 123
'  Content-Type: text/plain; charset=ISO-8859-1; format=flowed
'  Content-Transfer-Encoding: 7bit
'  Return-Path: <>
'  X-Antivirus: avast! (VPS 110621-0, 06/21/2011), Inbound message
'  X-Antivirus-Status: Clean
'  
'  This is a test 123
'  
'  
'  
'  **************************************
'  Content-Type: multipart/report; report-type=delivery-status;
'  	 boundary="------------070202040604030701060106"
'  
'  --------------070202040604030701060106
'  Content-Type: text/plain
'  Content-Transfer-Encoding: 7bit
'  
'  Blah blah blah. The delivery of this email failed. Blah blah blah
'  --------------070202040604030701060106
'  Content-Type: message/delivery-status
'  
'  Status: 5.1.2 (bad destination system: no such domain)
'  Diagnostic-Code: smtp; Permanent failure: no such domain
'  X-BounceCategory: bad-domain
'  
'  --------------070202040604030701060106
'  Content-Type: text/rfc822-headers
'  
'  X-Account-Key: account2
'  X-UIDL: 0D154945439D42BD80F180F6D9DE4D82
'  Received: with MailEnable Postoffice Connector;
'  	 Tue, 21 Jun 2011 09:21:23 -0400
'  Received: from qmta14.emeryville.ca.mail.comcast.net ([76.96.227.212]) by chilkatsoft.com with MailEnable ESMTP;
'  	 Tue, 21 Jun 2011 09:21:22 -0400
'  Received: from omta03.emeryville.ca.mail.comcast.net ([76.196.30.27]) by qmta14.emeryville.ca.mail.comcast.net with comcast id yd4k1g0050b6N64AEdLW9x;
'  	 Tue, 21 Jun 2011 13:20:30 +0000
'  Received: from [127.0.0.1] ([67.175.202.103]) by omta03.emeryville.ca.mail.comcast.net with comcast id ydLV1g00n2EMkZ78PdLWxi;
'  	 Tue, 21 Jun 2011 13:20:31 +0000
'  Message-ID: <4E009AA4.3090205@chilkatsoft.com>
'  Date: Tue, 21 Jun 2011 08:20:36 -0500
'  From: Chilkat Software <admin@chilkatsoft.com>
'  User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.17) Gecko/20110414 Thunderbird/3.1.10
'  MIME-Version: 1.0
'  To: Chilkat Support <support@chilkatsoft.com>
'  Subject: test 123
'  Content-Type: text/plain; charset=ISO-8859-1; format=flowed
'  Content-Transfer-Encoding: 7bit
'  Return-Path: <>
'  X-Antivirus: avast! (VPS 110621-0, 06/21/2011), Inbound message
'  X-Antivirus-Status: Clean
'  --------------070202040604030701060106--
'  
'