1. A method for forwarding an e-mail message from an e-mail server to a mobile terminal, the method comprising: storing an e-mail address of the mobile terminal, an associated permanent identifier of the mobile terminal, and associated encryption information generated by the mobile terminal; receiving the e-mail message associated with the e-mail address and sent by the e-mail server; encrypting the e-mail message using the stored encryption information; transmitting the encrypted e-mail message to a messaging centre for forwarding to the mobile terminal.