VPS for outbound email/SASL authentication

I have a client who needs me to automate archiving their outbound email.

One possible solution would be for me to run a VPS with Postfix configured to accept smtpd email from my clients and relay it to DH after attaching a bcc header to each one. One problem: I’d like to configure postfix to use the regular DH user id/password database for authentication. Is this possible? Is there a better solution?


To be honest, find a Microsoft exchange provider and point their email there. The site administrator can configure many policies concerning archiving and journaling. It’s hard to beat the Exchange/Outlook combination, and it has exactly what you are looking for as far as forced achieving.
I should add that not all exchange offerings out there are alike. Features you may be interested in are journaling and in-place archiving.