The USPS:
Introduction to Mailpiece Design - A properly designed mailpiece qualifies for the best postage rate possible! Properly designed mailpieces help you avoid unanticipated costs, and delays in delivery. This article outlines the proper steps in design
Postal Explorer - A search engine designed to search USPS publications.
Business Mail 101 - A tool for beginning or infrequent mailers that will help you harness the power of mail for your business or organization. This web site will walk you through all of the key decision points in making a mailing.
Postage Rates - Current domestic and international postage rates with a shipping calculator
Zip Code Lookup - A helpful tool to look up zip codes that go with an address
