Configure Postfix to prevent backscatter

one e-mail-account on our server receives non-delivery-notifications (backscatter) due to emails which have been sent before from other servers/spammers with the forged e-mail-address of that account. We have Postfix version 2.5.5. running and need to get the configuration changed that way these nondelivery notifications get blocked but not real nondelivery notifications for emails that we really sent. There´s a description on how to basically do this at: [login to view URL] As I´m not familiar in configuring Postfix or writing regex scripts, I would like you to assist me in doing what is needed. That said, I´d provide the current Postfix config files as needed so you could change them appropriately. Guess this could be done easily and quickly for someone who is familiar with Postfix configuration tasks. Please read the project first and write the word "Understood". Also write your steps and suggestions to complete the project with a short description of what you understood.