A:  The delivery audit trail:

 A record of the exact transmission of the Registered E-mail message.

B:  Delivery status:

Registered E-mail provides legal proof of sending, delivery and content and time.  RPost translates the delivery audit trail of each recipient address to report three levels of legal delivery.  The levels are, Delivered to Mail Server, Delivered to Mail Box and Opened.  The levels of delivery are analogous to the physical mail systems like DHL.  For example, if a DHL package is sent to a person in an office, someone in the mail room can sign for the package (RPost reports Delivered to Mail Server), an assistant or receptionist can sign for the package (RPost reports Delivered to Mail Box) or the receiver can sign for the package (RPost reports Opened).  In all three of those cases, the sender has proof the package was delivered and has proof that they fulfilled their requirement to send notification to that person.  Conversely, the sender has no proof the receiver ever opened the DHL package, read the contents or if the recipient even knows how to read.  The sender simply needs proof of delivery. 

There is no system in the world (physical or electronic) that can tell if a package or e-mail has been opened 100% of the time which is why the laws say you just need a signature.  In fact, the Lotus or Outlook receipt called a “Read Receipt” is actually not an accurate term.  The highest level of delivery for RPost Registered E-mail is when the Registered Receipt says, “Opened” or the sender receives at a later date an “Open” receipt.  The RPost system uses a variety of methods to establish the delivery status of Registered E-mail. The ability to prove whether the message was opened depends on the technical configuration of the recipient environment.  RPost can prove a message was opened in many but not all cases and uses the mail user agent (MUA) or HTTP " to "mail user agent (MUA), HTTP, or other techniques to determine whether the e-mail was opened.

C. Locked file attachment:

With default settings, RPost neither stores the Registered Receipt e-mails nor your e-mail message content or attachments.  Because RPost does not store the information on its network at all (to avoid possession of discoverable information) all of the data that would be needed to validate and reconstruct the original content and transmission information is compressed, encrypted, electronically sealed, and stored on the Registered Receipt e-mail the "Locked" attachment.  This renders the Registered Receipt e-mail tamper-detectable and durable, with a means of reconstructing the electronic original.

D. Verification address

If there is ever a dispute regarding the delivery or content of the message or attachment, the receipt can be AUTHENTICATED by simply forwarding it to the RPost verification address located on the receipt.  The RPost system de-crypts the "Locked" attachment, verifies the integrity of the internal data and reconstructs the electronic, validated original e-mail content and transaction data, returning it to the person who submitted the receipt for verification.  The Registered Receipt e-mail is durable, meaning that it can be forwarded to the disputing party and they can authenticate the receipt for themselves.  It can even be saved onto CD or keychain micro-drive and brought to an arbitrator for authentication. In every case, the system will regenerate the original proof of delivery and content.