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Add a compulsory message to every email

How do I add a compulsory message to every email that is sent out of my Exchange 5.5 and 2000 servers?

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In Exchange 2000, it is quite easy. You create a Transport Event Sink that adds your message to the end of every SMTP message. See for some sample code in VC++ on how to do this.

In Exchange 5.5, you use a DLL called IMSEXT.DLL. Details for installing the DLL can be found at Additional usage information can be found at

This was first published in August 2001

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