I want to save the email that are going to a list of our customers to a archive email box. So if one of the employees is sending an email to firstname.lastname@example.org from email@example.com, I want that email to go (as BCC) to firstname.lastname@example.org. At the moment we are using Thunderbird configured with BCC, but for some reason, some of the employees are deleting that line... I need something idiot proof. Is this possible using postfix? Can you give me a hint?