Our company just switched to a new email domain and wants to keep the old domain around for a year as they notify everyone about the change. The old email domain was on Exchange 2007 and the new email domain is on Google Apps. Everyone is 100% on Google Apps, and the Exchange server just forwards on emails.
I would like to replace the Exchange server (it's underpowered and a waste of resources just forwarding emails) with something lightweight, based around Postfix or another email server. It needs to do the following:
- Forward emails sent to old_domain.com to new_domain.com
- Autoreply to the sender that everyone's email has changed to new_domain.com
Is this possible with Postfix, and does anyone have documentation on how to do it? I know just enough Linux to be dangerous, so I want to be sure before I suggest this.