The sorting process at the USPS after the accepting your mail and confirming the postage and address for shipping purposes. The Multiline Optical Character Reader extracts the ZIP code lookup data in the address, and it prints the bar code on the item. It should then route it for further shipment and sorting before the mail gets to its destination it has to go through many sorting processes. In the final sorting that, the post office will deliver the mail to the ultimate addressee. The item is then delivered by a mail carrier to the receiverâs mailbox at home.