| 摘要 |
PURPOSE: To provide an electronic mail certification system capable of easily certifying that the transaction, contract and delivery/reception information of both of the sides are not altered, from the fair position of the third party. CONSTITUTION: A caller information terminal 1 transmits a document mail requiring the certification of contents to a receiving person information terminal 2 and transmits the copy of the document mail to the server 4 of a content certification provider. When the terminal 2 receives the document mail and confirms it requiring the certification of the contents, the terminal 2 sends an answer mail back to the terminal 1 and transmits the copy of the answer mail to the server 4 of the content certification provider. The server 4 of the content certification provider compares and confirms the contents of the copy of the document mail from the terminal 1 and the contents of the copy of the answer mail from the terminal 2, transmits the report of the comparing result to both of the terminal 1 and the terminal 2 and charges the terminal 1 based on charging information.
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