What are the three mailpiece processing categories?

The three mailpiece processing categories are Letters, Flats, and Parcels. This classification is important because it helps the postal service determine the most efficient methods for handling, sorting, and delivering mail.

Letters refer to standard-sized mail that can usually fit within the dimensions suitable for automated processing, like greeting cards or standard correspondence. Flats are larger pieces, which may include magazines or large envelopes that do not meet the criteria to be categorized as letters. Parcels include all packages and items that are larger and may require special handling.

This categorization is significant in the context of postal operations, as each type of mailpiece may have different requirements in terms of postage, handling time, and processing technology. Understanding these categories helps postal workers efficiently manage the flow of mail through various stages of processing and delivery.