An electronic business postal system collects, clears and delivers electronic business mail through a closed access, secure messaging system. A collection subsystem consists of access portals that are associated with secured system nodes. The access portals provide authenticated users access to the system to send and retrieve electronic business mail that includes postal system electronic delivery addresses, physical delivery addresses, or both. Secured message servers that are associated with the respective access portals process the electronic business mail into uniquely identified messages for delivery over the system nodes and also process received messages to provide the corresponding electronic business mail to the intended recipients through associated access portals. A delivery subsystem directs the messages through the system nodes associated with the senders' access portals to the system nodes associated with the recipients' access portals. A clearance subsystem confirms the integrity of both the messages and their delivery and ensures that each message is delivered once and intact.