| http://www.w3.org/ns/prov#value | - A method as set forth in claim 10 wherein the server retains a copy, except for the message, of the information received by the server from the agent of the recipient and sent to the sender and wherein when the sender wishes to authenticate that the message was sent by the server to the agent of the recipient, the server matches the information, except for the message, sent by the server to the se
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