What percentage of pieces in an automation price letter-size mailing must bear an Intelligent Mail barcode?

In order for a mailing to qualify for automation prices for letter-size mail, every piece must bear an Intelligent Mail barcode (IMb). This requirement ensures that the mail can be tracked throughout the mailing process, enhancing both the efficiency of handling and the accuracy of delivery. The Intelligent Mail barcode provides vital data about the mailing, which aids in processing and delivery, and ensures mailers receive the appropriate discounts associated with automated services. Since the policy stipulates that each piece in an automation price mailing must contain the barcode, the correct answer is that 100% of pieces must have it. This full compliance helps to streamline operations and offers benefits such as improved sorting and tracking by postal services.