Microsoft research figured out a way just to do this by modifying a few attributes of mail messages as they are being sent stopping people from doing just that!

No reply to all download

The primary function is to add a couple of buttons to the Outlook ribbon to prevent people from doing a reply-all to your message, or forwarding it (using a facility built into Outlook & Exchange which is really lightweight compared to using IRM machinery, but which is not exposed in the existing UI). However, it also includes a check for email goofs such as omitting attachments or subject lines.

This works with both Outlook 2007 and Outlook 2010, as long as you’re using an Exchange account.

Add-in buttons

When you install this thing, you’ll see a couple of extra buttons at the end of the ribbon: No Reply All and No Forward. As the names suggest, clicking on these will prevent recipients of your emails from performing those two actions; clicking again toggles the relevant option off again.

I ran into this info on the awesome MS tracker site..

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