| 摘要 |
Clients (200A to 200D) are provided with storage units (205A to 205D) for storing information on sent electronic mails, and stop sending a new electronic mail when a text identical to that contained in the new electronic mail is stored in the storage units (205A to 205D). As a result, duplicate sending of an electronic mail containing the identical text is avoided. A mail server (300) judges, when it receives a forwarded electronic mail MAILAB containing a text and an identifier attached to the text from a client (200B), whether or not the identifier is identical to one of those of the electronic mail received in the past. If this judgment result shows YES, the mail server (300) issues no reception notice to the client (200D) which the destination of the electronic mail. As a result, the same client (200D) does not receive the same reception notices of electronic mails containing the identical text.
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