E-mail system, client used for electronic mail system, mail server for electronic mail system, and computer-readable recording medium recording e-mail program

摘要

Each of the clients (200a to 200D) includes a storage section (205A to 205d) that stores information about the transmitted electronic mail, and when the body that corresponds to the text contained in the new e-mail is stored in the storage section (205A ~ 2050d), the delivery of a new e-mail Disgrace. This avoids duplication of electronic mail containing the same body. Also, if the mail server (300) receives the transfer e-mail mailab containing the text and the identifier assigned to the body from the client (200B), for example, it is determined whether or not the identifier coincides with the identifier associated with the received e-mail If the result of the determination is a coincidence, the reception notification is not issued to the client (200D) of the destination of the electronic mail. As a result, a situation in which a plurality of electronic mail including the same body is received and received from the same client (200D) is avoided.