USPS Office of Inspector General

Mailings that meet minimum volume and preparation requirements to qualify for reduced postage rates are called business mail. Properly accepting business mailings is critical for the Postal Service since it accounted for $25 billion in revenue in 2010. Several types of Postal Service facilities accept business mail. Business Mail Entry Units have acceptance clerks with specialized training and systems for accepting business mail. Local Post Offices can also accept business mail.
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The sale of stamps and related products are a core Postal Service business. The Postal Service prints billions of commemorative and definitive stamps annually to enable customers to mail pre-paid domestic and international mail and to also encourage stamp collecting. Given the traditional importance of stamps to the Postal Service, it is vital that the process by which stamps are distributed to customers be both timely and secure.

PostalOne!® is a web-based system designed to facilitate business mail processing and allows the Postal Service to electronically collaborate with business mail customers. It is also used to streamline the mail acceptance and postage payment process. Mailers can either submit a paper postage statement (a summary of items mailed showing postage) or use one of three electronic formats.

•Mail.dat®
•Mail.XML
•Postal Statement Wizard (PSW).