Reference Information

With technology leading the way and the complexity of postal services, it's important for us to be involved in your work as early as possible. The USPS is continually changing automation requirements. We're here to ensure you pay the lowest possible postage, in addition to ensuring fast and accurate mail delivery.

	Physical Standards for Commercial Letters and Postcards
	Address Requirements for Letters
	Tab Closure, and Glue Requirements
	Options for Return and Forward Service
	Flat Size Address Requirements
	Mailrite Indicia
	United States Postal Service