1. A method for forwarding an e-mail message from an e-mail server to a mobile terminal, wherein the mobile terminal has an e-mail address under the e-mail server, and permanent terminal identity and a temporary identity in an access network, the method comprising: installing a connectivity function and a messaging centre that are operationally coupled to each other, wherein the connectivity function is operationally coupled to the e-mail server and the messaging centre is operationally coupled to the access network; the connectivity function detecting the e-mail message at the e-mail server, encrypting at least part of the e-mail message to create an encrypted e-mail message and sending the encrypted e-mail message to the messaging centre; the messaging centre detecting the encrypted e-mail message and sending it via the access network to the mobile terminal; the mobile terminal receiving and decrypting encrypted e-mail message.