MAIL SERVER FOR ELECTRONIC MAIL AND MAIL CLIENT

摘要

PROBLEM TO BE SOLVED: To facilitate unreading/reading management of a mail at a client by providing plural mail servers, transferring and storing the mail with an added identifier to the mail servers. SOLUTION: A main mail server 101 is the mail server to exist in a network 105 to which a mobile mail client 109 mainly belongs. Subordinate mail servers 102 to 104 are mail servers belonging to networks 106 to 108 with probability to be connected with the mobile client. The mail from preliminarily registered user is read from a mail server S/W, a mail identifier is generated, stored in a mail storage device and the mail is transferred to the subordinate mail servers 102 to 104 to exist in other network with the mail identifier by ciphering the mail by a mail ciphering program by using a mail transfer program by a mail management program.