This podcast describes the mail sorting and delivery process at the post office. It details how a letter travels from the sender to the recipient's mailbox. The process begins with sorting machines that sort mail by size and shape using optical character recognition (OCR) to read addresses. Mail is then sorted by ZIP code using barcode sorters that apply a barcode to each piece. These pieces are grouped into bundles and transported to the appropriate post offices where mail carriers sort them by route and delivery sequence for final delivery.

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