Mail Classifications
The Postal Service divides mail into different services, called "classes." Each class of mail has different features, service levels, postage rates, and presort requirements.
For most of your mailings, the content of the material and postage rate will determine the class of mail you select. To learn more about each class of mail—just click below on the name of the class of mail.
Also please note that the US Postal Service is a wonderful resource for updates on mail classification requirements. Please visit www.usps.com to find the most up-to-date postage rates, sizes, and maximum and minimum weights.
