VB.NET

Create DSN (Delivery Status Notification) Email

See more Email Object Examples

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

Dim success As Boolean = False

Dim email As New Chilkat.Email

email.Subject = "Test"
email.From = "joe@example.com"
email.Body = "This is a test"
email.AddTo("","recipient@example.com")

Debug.WriteLine(email.GetMime())
Debug.WriteLine("")
Debug.WriteLine("-------------------------------------------------------------")
Debug.WriteLine("")

' This is the email we just created:

' MIME-Version: 1.0
' Date: Mon, 12 May 2025 11:13:15 -0500
' Message-ID: <917FA49F75544EF51948B0A52F403B925B51073F@SLICE>
' Content-Type: text/plain; charset=us-ascii; format=flowed
' Content-Transfer-Encoding: 7bit
' X-Priority: 3 (Normal)
' Subject: Test
' From: joe@example.com
' To: recipient@example.com
' 
' This is a test

' -----------------------------------------------------------------
' Convert the above email into a DSN (Delivery Status Notification)

Dim xml As New Chilkat.Xml
xml.Tag = "DeliveryStatusFields"
xml.NewChild2("Final-Recipient","rfc822; recipient@example.com")
xml.NewChild2("Action","failed")
xml.NewChild2("Status","5.1.2")
xml.NewChild2("Diagnostic-Code","smtp; 550 5.1.2 Host unknown (Domain name not found)")
Dim dtNow As New Chilkat.CkDateTime
dtNow.SetFromCurrentSystemTime()
xml.NewChild2("Last-Attempt-Date",dtNow.GetAsRfc822(True))

Dim headerOnly As Boolean = True
Dim sbText As New Chilkat.StringBuilder
sbText.Append("This is an automatically generated Delivery Status Notification." & vbCrLf & vbCrLf)
sbText.Append("Delivery to the following recipient failed permanently:" & vbCrLf & vbCrLf)
sbText.Append("    recipient@example.com" & vbCrLf & vbCrLf)
sbText.Append("Technical details of permanent failure:" & vbCrLf)
sbText.Append("DNS Error: Domain name not found" & vbCrLf)

Dim explain As String = sbText.GetAsString()

Dim dsnEmail As New Chilkat.Email
success = email.ToDsn(explain,xml.GetXml(),headerOnly,dsnEmail)
If (success = False) Then
    Debug.WriteLine(email.LastErrorText)
    Exit Sub
End If


Debug.WriteLine(dsnEmail.GetMime())

' Here's the MIME of the DNS email we just created:
' -------------------------------------------------

' Content-Type: multipart/report; report-type="delivery-status"; boundary="------------060100020300020303000802"
' 
' --------------060100020300020303000802
' Content-Type: text/plain; charset=windows-1252; format=flowed
' Content-Transfer-Encoding: 7bit
' 
' This is an automatically generated Delivery Status Notification.
' 
' Delivery to the following recipient failed permanently:
' 
'     recipient@example.com
' 
' Technical details of permanent failure:
' DNS Error: Domain name not found
' 
' --------------060100020300020303000802
' Content-Type: message/delivery-status
' 
' Final-Recipient: rfc822; recipient@example.com
' Action: failed
' Status: 5.1.2
' Diagnostic-Code: smtp; 550 5.1.2 Host unknown (Domain name not found)
' Last-Attempt-Date: Mon, 12 May 2025 11:30:39 -0500
' 
' --------------060100020300020303000802
' Content-Type: text/rfc822-headers; charset=windows-1252
' 
' MIME-Version: 1.0
' Date: Mon, 12 May 2025 11:30:39 -0500
' Message-ID: <B8E6875D582A78AE779FC0B46ACC8C858CEAF608@SLICE>
' Content-Type: text/plain; charset=us-ascii; format=flowed
' Content-Transfer-Encoding: 7bit
' X-Priority: 3 (Normal)
' Subject: Test
' From: joe@example.com
' To: recipient@example.com
' --------------060100020300020303000802--