An email deletion server that deletes a transmitted email transmitted from an email server by a sender, the email server being used for a transmission/reception service of an email transmitted/received by a client terminal, the email deletion server comprising: a deletion request information storage unit that stores identification information of an email and identification information of at least one receiver of that email, the email being requested to be deleted by a sender; and an email deletion processing unit (1D, 1D2, 1D3) that updates, for the email server, a process for deleting an email from a reception email area of the receiver based on the identification information of the email and the identification information of the receiver stored in the deletion request information storage unit, the email being identified by the identification information of the email and the identification information of the receiver, wherein the email deletion processing unit (1D, 1D2, 1D3) generates a deletion schedule of the email, deletion of which has been requested, at a specific date/time based on a specific character string in which the sender adds deletion of the email in a content of the email, and updates, for the email server, the process of deleting the email from the reception email area of the receiver according to the generated deletion schedule, and searches the email server for the email corresponding to the identification information of the receiver by logging in the email server based on registration information included in the identification information of the receiver, wherein when an update email updating a content of the transmitted email is transmitted from the sender the email deletion processing unit (1D, 1D2, 1D3) generates a deletion schedule of the email at a specific date/time based on a specific character string in which the sender adds deletion of the email in a content of the update email, and updates, for the email server, a process of deleting the email from the reception email area of the receiver according to the generated deletion schedule. a deletion request information storage unit that stores identification information of an email and identification information of at least one receiver of that email, the email being requested to be deleted by a sender; and an email deletion processing unit (1D, 1D2, 1D3) that updates, for the email server, a process for deleting an email from a reception email area of the receiver based on the identification information of the email and the identification information of the receiver stored in the deletion request information storage unit, the email being identified by the identification information of the email and the identification information of the receiver, wherein the email deletion processing unit (1D, 1D2, 1D3) generates a deletion schedule of the email, deletion of which has been requested, at a specific date/time based on a specific character string in which the sender adds deletion of the email in a content of the email, and updates, for the email server, the process of deleting the email from the reception email area of the receiver according to the generated deletion schedule, and searches the email server for the email corresponding to the identification information of the receiver by logging in the email server based on registration information included in the identification information of the receiver, wherein when an update email updating a content of the transmitted email is transmitted from the sender the email deletion processing unit (1D, 1D2, 1D3) generates a deletion schedule of the email at a specific date/time based on a specific character string in which the sender adds deletion of the email in a content of the update email, and updates, for the email server, a process of deleting the email from the reception email area of the receiver according to the generated deletion schedule.