1. A method of notifying of the arrival of and selectively forwarding E-mail messages sent to a user's computer system to the user at a remote location, comprising the steps of: configuring the user's computer system to forward E-mail messages received to a forwarding server; detecting that an E-mail message has arrived at the user's computer system and forwarding said message to said forwarding server; receiving an E-mail message directed to user's computer system from a message sender; in response to the receipt of said received E-mail message, forwarding the said message from the user's computer system to said forwarding server; selecting said E-mail message in said forwarding server; forwarding the selected E-mail message to said user at a remote location; generating reply messages at the said remote user location to be sent to the E-mail message sender; transmitting the reply message to the forwarding server; receiving the reply message at the forwarding server; processing the reply message at the forwarding server; and transmitting the reply message from the forwarding server to identified recipients of said reply message.