| 摘要 |
PROBLEM TO BE SOLVED: To provide a mail server, etc., capable of avoiding the reception of a large quantity of mails from an unknown sender, without conducting complicating works. SOLUTION: The mail server 104 receives an electronic mail (e-mail), obtains first mail reception information (information on a reception date, a sender, a destination and a data capacity (size)) and calculates the sum total of the received data capacity of the e-mail within a first retrieving period (first total reception capacity) by the combination of a sender and a destination. When the first total reception capacity exceeds the first upper limit, the mail server 104 adds this combination to a server side reception prohibition list. After this, when the sender and the destination obtained in advance of the reception of the e-mail are set to rejection of reception (register to the list), the error is returned to a transmission source, without being received; when they are not set to rejection of reception, normal reception processing is performed.
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