US Patent 8003910 Mail delivery system and method

The invention provides a method for preparing mail for delivery by first sorting mail to carrier delivery order to create a series of batches of mail for delivery to respective recipients, then packaging the batches of mail in mail holders. Application of computer-implemented alert trigger criteria are used to determine whether a condition exists indicating an enhanced probability that one or more mail pieces in each batch is not correctly addressed such that it should not be delivered to that recipient. An alert mark is then printed on the mail holder for a batch containing one or more mail pieces having an enhanced probability of not being correctly addressed.