USPS Intelligent Mail
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The US Postal Service is promoting the use of this barcode because it expands the ability to track individual mail pieces and provides customers with greater visibility into the mail-stream. USPS will require the use of this barcode to qualify for automation printing beginning in May 2011. For further information, see:
The information to be barcoded is a string of numbers 20 to 31 digits long. Please note that the only validation that eFORMz performs on the data is to make sure there are at least 20 digits and that all the characters are digits. From this we determined that the “Width” should be set between 14.976 and 18 decipoints and the height should be set between 30 and 39.6 decipoints.