Matching and forwarding fake e-mail to existing e-mail

To guarantee anonymity and protect privacy to users, I am required to set-up an e-mail server that does something like this: Upload generated e-mails (sdf12@domain.com) and real e-mails (bob@company.com) Receive e-mails from generated e-mails (sdf12@domain.com). Send-emails to real e-mails (bob@company.com). Thus: mails from sdf12@domain.com go to bob@company.com How do I do this? Postfix? And how…