Please read the link in my signature for future reference. You mention
neither the product nor the version.
In Outlook 2007, Tools->Options->E-Mail Options->At the bottom. Use the
dropdowns to control if you include the message or not.
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Milly Staples [MVP - Outlook]
Post all replies to the group to keep the discussion intact.
ALWAYS post your Outlook version.
How to ask a question: http://support.microsoft.com/KB/555375