A receiver receives e-mails. In the case where an address of an e-mail is a user's e-mail address which is managed by another e-mail server device, a transfer unit transfers the e-mail to the another e-mail server device. In the case where an address of an e-mail is a user's e-mail address which is managed by an e-mail server device including an inquiry unit, this inquiry unit inquires of the corresponding user whether to accept the e-mail to be delivered from its e-mail addresser. In the case where the user does not accept the e-mail to be delivered, a notification unit sends a message for informing the addresser that there is no user having a public e-mail address. In the case where the conditions for delivering an e-mail are all satisfied, a delivery unit delivers the e-mail to a user having a public e-mail address.

 
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