United States Postal Service (USPS) Information
The Postal Service publishes everything you want to know about all types of mail pieces and services on its Quick Services Guide web page.
- Address Quality Standards;
- Move Update Requirements;
- Endorsements;
- Postage Payments;
- First Class Mail;
- Periodicals;
- Standard Mail;
- Mail Piece Design;
- Mail Preparation, Qualification and Standards;
- Reply Mail; and
- Special Services.
These guides are very user-friendly and provide detailed information about all USPS products and services.