Believe it or not, with any letters sent to a NON-DOMESTIC address (or by not using ZIP and spelling state) in mailings for just 3 cents. At first everyone has been met with some resistance, but once the local postmaster looks into it, they will see one is correct. Using NON-DOMESTIC mail forces the use of the United States Post Office (USPO), the one Ben Franklin started. Without this approach, we end up using the US Postal Service (USPS) even though BOTH exist in the same building. All that matters, is one knows how to label the packages so each office can utilize the private or public side of the post office. Occasionally a letter or package will receive a "postage due" notice which has no relevance for letters, but can end with a package being held hostage until funds are paid or the postmaster understands the law. NON-DOMESTIC simply means outside the District of Columbia, the original united States, as does the non-abbreviated state and no ZIP code (a military Federal control zone).