US Patent 7831834 Associating a postmark with a message to indicate trust

A method and system directed to the communication of the trust characteristics of electronic messages using visual and audio postmarks. The postmarks may represent a particular trust level on a continuum that can range from suspicious to trusted. A message system may determine the baseline trust level of a message and assign a postmark to the message. The postmark can communicate the trust level of the message to a user without requiring the message to be opened or read. In one embodiment of the invention the user can create rules and filters to classify messages by trust level.