From Bulk mail to First-Class and International mailing rules and regulations, here are some helpful tips and suggestions for mailing from within the United States.

Bulk Mail
Here you'll learn about bulk business mail, how to qualify for bulk rates, and find resources to help you prepare your project for bulk mailing. 

Business Mail 101
This site walks you through all of the key decision points in making a mailing. Great for beginning or infrequent mailers.

Business Rate Calculator
This postal rate calculator computes rates for volume mailings of all classes of mail and discount options.

Classes Of Mail
The Postal Service divides mail into 5 classes. Each class of mail has different features, service levels, postage rates, and presort requirements. Look here to determine which class your mail piece fits into.

Designing Flat Mail
This PDF article provides tips for understanding flat sort machines and barcode readers, as well as some basic info about automation and barcodes from the U.S. Postal Service.

Designing Letter & Reply Mail
This PDF article covers the benefits of automation, barcodes, and business reply mail are covered in this PDF article.

Interactive Business Mail Decision Tree
This interactive Decision Tree helps you decide which mailing option is best for you. By answering a few simple questions, the Decision Tree quickly points you to the mailing option that's best for you and suggests ways to qualify for even lower postage rates. 

International Mail
Here you'll find a handful of resources for answering your questions about International bulk mail.

International Mail Manual
The IMM contains the policies, regulations, and procedures governing international mail services provided by the U.S. Postal Service.

Non-Profit Eligibility
See if you qualify for non-profit rates through the U.S. Postal Service.

Official State & Street Abbreviations
Here's a chart listing the proper abbreviations for use when addressing your business mail.

Packaging for Mailing
Tips for packaging that's acceptable for U.S. Postal Service delivery, including containers, cushioning, closing, sealing, reinforcing, marking, and more.

Postage Rates & Fees
Here is the U.S. Postal Service's current fee structure for postal services and stamps.

Postal Addressing Standards
This PDF article covers all of the issues regarding how to address your mail piece.

Postal Zone Charts
These Official National Zone Charts identify the appropriate distance code (or "zone") assigned to each originating and destinating ZIP Code pairing for every ZIP Code in the nation. The Zone Charts create a matrix of originating and destinating ZIP Codes and identify the correct zone for the distance. 

Quick Postal Tips 
Are you designing new corporate stationery? Creating a postcard? Getting ready to plan your next mailing? Don't go any further without reading this valuable information first.

Testing The Limits of the U.S.P.S.
A light-hearted look at the delivery practices of the U.S. Postal Service.

U.S.P.S. Rates & Mailing
Here are a handful of links from the Postal Service providing you with information about rates and mailing information pertaining to Direct Mail. 

U.S.P.S. Tips For Mailing Direct Mail Pieces
This PDF article points out the best ways to get your Direct Mail piece through the mail system.