The S/MIME features can be used to provide secure message store. CommuniGate Pro can encrypt all or certain messages before it stores them in user Mailboxes.
The Store Encrypted Rule action is used to encrypt incoming E-mail messages and store them in the specified Mailbox.
Messages are encrypted using the S/MIME Certificate of the Mailbox owner. If the Store Encrypted Rule action is used in an Account-Level (i.e. in an Account or in a Domain-wide) Rule, and the specified Mailbox does not belong to the user Account, the message is encrypted using the Certificates of the Mailbox owner and the current Account.
The Account john has a Rule with the following action: Store Encrypted in -jim/INBOX When this action is taken, the message is stored in the INBOX Mailbox of the Account jim enrypted with both john and jim Certificates. Both jim and john can decrypt and read this message.