Patent ID: 6321267
Filing Date: 2001-11-20
Classification: H04L

Abstract:
A system for detecting and selectively preventing reception of an electronic message to a local message transfer agent (MTA), the electronic message having an address identifying a sender and transferred over a connection from a remote host, the system comprising:a dialup filter determining whether the connection is a dialup connection and, if the connection is a dialup connection, terminating the connection;a relay filter determining whether the remote host is an open relay and, if the remote host is an open relay, terminating the connection; and,a user filter verifying whether the sender of the electronic message is authorized and, if the sender of the electronic message is not authorized, terminating the connection;wherein, said system establishes communication over the connection between said remote host and the local MTA if said system determines that the connection is not a dialup connection, said relay filter determines that the remote host is not an open relay and said user filter verifies the sender as authorized.