Registered Mail - is the most secure service that the USPS offers. It incorporates a system of receipts to monitor the movement of the mail from the point of acceptance to delivery. Registered Mail provides the sender with a mailing receipt and upon request, electronic verification that an article was delivered or that a delivery attempt was made. Customers can retrieve the delivery status in three ways; (1) over the internet at www.usps.com by entering the article number shown on the mailing receipt; (2) by telephone at 1-800222-1811; or (3) by bulk electronic file transfer for mailers who provide an electronic manifest to the USPS. USPS maintains a record of delivery (which includes the recipientís signature) for a specified period of time. Postage insurance may be purchased to cover articles valued up to $25,000. Return receipt and restricted delivery services are available for additional fees. Added security may delay delivery by 24 to 48 hours.