A SECURE EMAIL DELIVERY SYSTEM

摘要

A secure email delivery system (1) acts as a relay between a client computer (2) using Web mail services on a mail server (4) and with the mail server (4). It thus handles incoming and outgoing messages. A policy manager (74) determines a security policy from a policy database (30) when an outgoing message is received. According to this policy, the message may be signed and encrypted transparently to the user. All registered users have a policy and the system captures security data for communication with non-registered users when they reply to outgoing messages from registered users.