NoReplyAll Add-in for Outlook 2010 adds a couple of buttons to the Outlook ribbon to prevent people from replying to all the recipients of your message or forwarding it.
The NoReplyAll add-in uses a facility built into Outlook and Exchange that is more lightweight than information-rights management but is not exposed in the existing UI. The add-in also includes a check for common email errors, such as omitting attachments or subject lines.
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