Patent ID: 8380976

Claim:
A computer program product executable by a server connected to a plurality of clients so as to be able to transmit and receive electronic mails thereto and therefrom to thereby relay the electronic mails, the computer program product comprising: a computer readable memory to store instructions, wherein execution of the instructions causes the server to implement: an electronic-mail receiving section to receive an electronic mail that is newly created by one of the clients with quotation from one or a plurality of electronic mails received in the past; a destination determining section to determine, for each quoted electronic mail quoted in the received electronic mail, whether a destination designated in the received electronic mail is included in an originator and a destination set in each quoted electronic mail; an editing section to edit the content of each quoted electronic mail that is determined by the destination determining section not to include the destination designated in the received electronic mail, wherein editing the content comprises any of the following: editing the quoted electronic mail into an unreadable state; deleting the quoted electronic mail; or encrypting the quoted electronic mail; a transferring section to transfer the electronic mail including the quoted electronic mail edited by the editing section to the designated destination; and an information storing section to store edition information for returning the quoted electronic mail edited by the editing section to a state before the editing in association with information that identifies the received electronic mail.