Re: [Exim] Wanted: encrypted mail storage

On Wed, Aug 06, 2003 at 04:48:56PM -0400, Rich Johnson said:
> Does anyone know of a way to encrypt the mail storage? My goal is to
> add a layer of privacy to the mail--especially mail for virtual
> users--which is stored on the server and replicated on the server
> backups.
>
> - An ideal method would support per-user/virtual-user keys for
> delivered messages.
> - Queued and/or frozen messages could use the TLS key.
> - Both the MTA(exim) and IMAP server (courier-imap) would need to
> support the method chosen.

Hmm. Seems to me that you could deliver to mailboxes piping via gnupg.
Not too hard on the exim side, but I don't know about courier (I don't
use it.) You would probably need to code something into it. Do you
really need to deal with queued / frozen mail too?

Anyway, SOMEWHERE you are going to need to have unencrypted keys if you
want to decrypt on the fly. Either that or let the users decrypt
everything themselves and you just wrap each email in pgp using a public
key they give you.