I actually have sent out about a 100 prepaid postage. There is a specific way to do the addresses. For example where you put your information on the top left, it needs to have your first name, sui juris behind it, then next line but in care of, then next couple of lines, write out the entire address and after your state, put Republic, next line you need to put NON-DOMESTIC, WITHOUT U.S
Then whom you address it too, make sure you put brackets around the zip code. DON'T PUT A ZIP CODE ONE YOUR ADDRESS. It has worked every time. I also have the labels that I have printed, signed it in red, red thumb print, one cent stamp at the bottom right and signed my name through the stamp