System and method for preventing unsolicited e-mail

摘要

A connection request from a remote host is denied by an email service system, if the number of connection requests from the remote host exceeds a predetermined reference number, and the responsibility to re-send the denied email is transferred to the requesting host. For the determination of connection permission or denial, the number of connection requests from the remote host is calculated with reference to a corresponding IP address. By the IP filtering scheme, email traffic can be effectively managed and controlled. The email service system includes a dynamic IP filtering module, a receiving means for accepting a connection request from a remote host, a means for extracting an IP address corresponding to the remote host, and a means for comparing a predetermined reference value with a summation value of the number of past requests made during a predetermined control time period and the current request from the extracted IP address.