| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem of an increase in storage capacity and network load of a mail server because of increasing mail traffic in mobile phone carriers. SOLUTION: A relay device for relaying a mail transfer (SMTP communication) and a mail fetch (IMAP communication) is installed in a carrier facility network. The relay device compresses a mail including a header transferred from a mail transfer server, adds a new header to encapsulate the mail, and transmits the encapsulated mail to an IMAP server as a compressed mail. In response to a mail fetch request from a communication terminal, the relay device decapsulates and restores the compressed mail fetched from the IMAP server, and transmits the restored mail to the communication terminal. The relay device changes parameters, such as the mail size, to prevent inconsistency of IMAP commands from occurring in compressing/restoring the mail. COPYRIGHT: (C)2011,JPO&INPIT
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