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"In mail prep, we work with clients in advance to get e-files of addresses for mailing," he explains. "Then we certify the addresses with a database from USPS. Addresses are certified, then the address and bar code are sprayed on." Pieces come out sorted in ZIP+4 order.

The optical character reader/bar code reader (OCR/BCR) looks up preaddressed mail, certifies addresses, sprays on a bar code, sorts it in ZIP code order, and it goes to the post office.