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How to add a disclaimer to outgoing SMTP messages in Visual Basic

This article was previously published under Q317327
For a Microsoft Visual Basic Scripting Edition version of this article, see 317680.
This step-by-step article describes how to use an SMTP transport event sink to add a disclaimer to outgoing SMTP e-mail messages.

Create the event sink

  1. Create a new Microsoft Visual Basic ActiveX DLL. Name the project SMTPEventSink, and then name the module Disclaimer.
  2. Under Project References, add Microsoft CDO for Exchange 2000 Library, and then add Server Extension Objects COM Library.
  3. Put the following code in the module:
    Dim TextDisclaimer As StringDim HTMLDisclaimer As StringImplements IEventIsCacheableImplements CDO.ISMTPOnArrivalPrivate Sub IEventIsCacheable_IsCacheable()    'Just returns S_OK.End SubPrivate Sub Class_Initialize()  'TODO: Replace the sample disclaimer text with your own text.  TextDisclaimer = vbCrLf & "DISCLAIMER:" & vbCrLf & "Sample Disclaimer Text."  HTMLDisclaimer = "<p></p><p>DISCLAIMER:<br>Sample Disclaimer Text"End SubPrivate Sub ISMTPOnArrival_OnArrival(ByVal Msg As CDO.IMessage, EventStatus As CDO.CdoEventStatus)    If Msg.HTMLBody <> "" Then        Dim szPartI As String        Dim szPartII As String        Dim pos As Integer                'Search for the "</body>" tag and insert the disclaimer before that tag.        pos = InStr(1, Msg.HTMLBody, "</body>", vbTextCompare)        szPartI = Left(Msg.HTMLBody, pos - 1)        szPartII = Right(Msg.HTMLBody, Len(Msg.HTMLBody) - (pos - 1))        Msg.HTMLBody = szPartI + HTMLDisclaimer + szPartII    End If    If Msg.TextBody <> "" Then        Msg.TextBody = Msg.TextBody & vbCrLf & TextDisclaimer & vbCrLf    End If        'Commit the content changes to the transport ADO Stream object.    Msg.DataSource.Save    EventStatus = cdoRunNextSinkEnd Sub					
  4. Replace the sample disclaimer text with your own disclaimer text, and then build the DLL.

Register the event sink

To register the event sink, use the Smtpreg.vbs file that is installed with the Exchange software development kit (SDK).
  1. At a command prompt, locate the \Exchange SDK\SDK\Support\CDO\Scripts folder, and then type the following: cscript smtpreg.vbs /add 1 OnArrival SMTPDisclaimer SMTPEventSink.Disclaimer "mail from=*"

    If this command succeeds, you receive a success message that is generated by the script.
  2. To unregister this event, type the following: cscript smtpreg.vbs /remove 1 OnArrival SMTPDisclaimer
For additional information about managing event bindings, visit the following Microsoft Developer Network (MSDN) Web site:

Test the event sink

To test the event sink, send an e-mail message to an SMTP recipient who is external to your organization. The recipient receives a modified message with the disclaimer text added to the end of the message.

Note If you use a MAPI client, such as Microsoft Outlook, to send the e-mail message, the recipient does not receive a modified e-mail message. This is because the e-mail message that is submitted by using MAPI is not in an SMTP format when the e-mail message triggers the SMTP transport event. Therefore, changes that are made by the code of the event are not persisted.
For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
273233 Cannot change MAPI message contents in a CDO SMTP event sink

Article ID: 317327 - Last Review: 11/30/2007 07:01:09 - Revision: 8.7

  • Microsoft Exchange Server 2003 Standard Edition
  • Microsoft Exchange Server 2003 Enterprise Edition
  • Microsoft Exchange 2000 Server Standard Edition
  • Collaboration Data Objects for Exchange 2000
  • Microsoft Collaboration Data Objects 2.0
  • kbhowtomaster KB317327