All mail pieces entering the mail-stream are separated into how many categories?

Mail pieces entering the mail-stream are separated into three categories: First-Class Mail, Standard Mail (which includes Marketing Mail), and Package Services. This classification system is essential for the efficient processing, handling, and delivery of mail.

First-Class Mail is primarily for items that require speedy delivery, including letters, postcards, and small packages. Standard Mail, now recognized as Marketing Mail, is utilized for bulk mailings of advertisements, promotional material, and other non-urgent correspondence. Finally, Package Services encompasses parcels, which includes services like Priority Mail and Parcel Select, designed for shipping packages.

Understanding these categories helps postal workers ensure that each piece of mail is treated appropriately according to its level of service, urgency, and delivery requirements.