| 摘要 |
PURPOSE: A method of backup and restoration of an e-mail, and an attachment file download authentication system are provided to send e-mail text to a plurality of the mail receivers, and an attachment file to a several authenticated users only. CONSTITUTION: A mail checking web page is connected(S100). Whether an unprocessed identifier about a connected account exists or not is checked(S200). A user selects the attachment file(S310). While the user writes the e-mail, the file size of the attachment is checked(S330). The e-mail text and an attachment file are stored to a file server(S350). If the file size of the attachment file is within the allowance file size, the e-mail text and the attachment file are stored to the mail server(S353). |
