So.... I am currently working to migrate our MS Exchange system over to Postfix. The way things are set up is we have a forward set on our public mail systems that will forward mail destined for email@example.com to firstname.lastname@example.org. I want to make things as streamline as possible and prevent any of my users from having to update contacts with a new email address. I would like to be able to force a reply address for each user. In Exchange I just specify the email address for each user account, so basically that is the function Im looking for. In Exchange it will also send the message from email@example.com to look like its being sent from firstname.lastname@example.org as to not confuse the recipients. I know I can just set the IMAP clients for each user to do this for me, but I dont want to depend on my end users to do this correctly (Im sure you can appreciate that). Thanks for any help you can provide!