Intelligent Mail Barcode Print Specification

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The Intelligent Mail barcode (IMb) replaced POSTNET with a 4-state bar encoding scheme using tracker, ascender, descender, and full-height bars. It carries up to 31 digits of routing and tracking data in a fixed 65-bar format. Print specifications require precise bar height ratios and a fixed 2mm quiet zone to meet USPS automation compatibility.

  



  

  
  

    
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      Intelligent Mail