PROBLEM TO BE SOLVED: To provide a mail server which can prevent malware infection more reliably.;SOLUTION: A communication unit 12 receives e-mail and an acquisition request for requesting acquisition of e-mail. A normal mailbox stores the e-mail received by the communication unit 12. An emergency mailbox stores emergency mail which is predetermined e-mail. When the communication unit 12 receives an acquisition request, a control unit 13 delivers, in normal mode which does not restrict e-mail acquisition, the e-mail stored in the normal mailbox, or delivers, in restricted mode which restricts e-mail acquisition, the emergency mail stored in the emergency mailbox.;SELECTED DRAWING: Figure 2;COPYRIGHT: (C)2019,JPO&INPIT
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