What is indicated by the term 'machinable' in the context of USPS Presorted Marketing Mail?

The term 'machinable' in the context of USPS Presorted Marketing Mail refers to items that can be processed automatically by postal sorting machines. This means that these items meet specific physical criteria, such as size, weight, and shape, allowing them to be efficiently handled and sorted without the need for manual intervention.

Being machinable is important for both the postal service and the senders because it speeds up the mailing process and can reduce shipping costs by qualifying for discounted rates. Items that don't meet machinability requirements typically require more labor-intensive manual handling, which can increase processing time and costs. Thus, the capacity for automatic processing distinguishes machinable items from those that are not.