IIRC not possible with Exchange 5.5
There are a lot of tools that can do this and perhaps you've got this
functionality already in your serverside virusscanner (to note that the
message has been scanned). Check with the EULA of the virusscanner if you
are allowed to use it for a company disclaimer as well.
--
Robert Sparnaaij [MVP-Outlook]
www.howto-outlook.com
Tips of the month:
-What do the Outlook Icons Mean?
-Create an Office 2003 CD slipstreamed with Service Pack 1