Does putting the barcode on a piece of unsorted mail benefit at all?

Does putting the barcode on a piece of unsorted mail benefit at all?
Will the barcode be read instead of another being printed on the bottom edge?

Best answer:

The USPS does not recommend putting a barcode on mail that you do not intend to use the automation rate, because it will not speed up your mail and if used incorrectly, will actually slow delivery. This implies that the barcode would be read.