Privileged list owners can change where a reply to mail lists is sent. Log in to the list web interface at https://lists.illinois.edu and:  

1. Select the list they want to change. Then select "Admin" from the menu on the left.
2. Click on the "Edit List Config" tab
3. Click the "Sending/receiving setup" tab
4. Scroll to the "Reply address" section.  Privileged List owners will see three fields they can modify.   
5. Select the options that meets your needs.
6. Click (Update) button at bottom

Note:  A detailed summary of the options are available from the Reply address section of the user's guide.