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How do I prove an email was delivered and the content of the message?

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The receipt can be authenticated by simply forwarding it to the RPost verification address located on the receipt.  The RPost system unlocks the encrypted attachment, regenerates digital fingerprints and hashing data to prove its integrity, and sends the original back to the person who submitted the receipt for verification.  The Registered Receipt email is very durable, meaning that it can be forwarded to any disputing party and they can authenticate the receipt.  In every case, the RPost system will regenerate the original email and all attachments if authentic, but otherwise deliver a notice that the email had been tampered subsequently and no longer valid where that is determined to be the case.