well, i found this on a random website:
Our marketing department sends a daily newsletter to the entire company. Can I let users reply to the message but not let them use Reply to All on the message?
The marketing department is probably sending to a distribution list (DL) in the Global Address List (GAL), so I can understand why the department wouldn't want users to respond to everyone on that list. One way to handle this situation is to instruct the marketing department to put the DL recipient in the Bcc box. That way, no one can see exactly whom the message was sent to or reply to all the recipients. Rather than leave the To box blank, which some people might interpret as junk mail, create a public folder for archiving the daily messages and put that folder's address in the To box. You can set permissions on the folder so that only the marketing department can add new items to it. In this case, users who click Reply to All will get a message back from the folder saying that they didn't have the access permission to add to the folder.
If you want to completely remove the possibility of anyone using the Reply to All command, create a custom message form to use for distributing the newsletters by following these steps:
Create a new message. Include any boilerplate text that appears in every newsletter and the usual To addresses.
Choose Tools, Forms, Design This Form to put the message into design view.
Switch to the (Actions) tab.
Double-click the Reply to All action to display the Form Action Properties dialog box, which Screen 1 shows.
Clear the Enabled check box, then click OK.
Publish the form to the Organization Forms Library.
The marketing department folks can now compose their newsletter by choosing the form from the Organization Forms Library (Tools, Forms, Choose Form). When users open the message, they won't even see the Reply to All command, only Reply and Forward. Note that you can disable the Forward command, too, if you want to make it more difficult for someone to forward confidential information outside your organization.