| 摘要 |
PROBLEM TO BE SOLVED: To deter receiving again a message that has the same content as what was received in the past. SOLUTION: A duplicate mail checking part 19 judges whether or not what coincides with check information stored in duplicate check tables 17a to 17c exists in attribute information set to the header of an electronic mail when the electronic mail is received, and when it is judged that it exists, a duplicate notice transmitting part 22 transmits a duplicate notice mail to the originator of the received electronic mail and when it is judged what coincides with the check information stored in the tables 17a to 17c does not exist in the attribute information of the received electronic mail, an SMTP receiving part 20 stores the electronic mail in a mail box that is associated with the address of the receiver. |
