To dream of United States mail box, implies that you are likely to be involved in an illegal business. To drop a letter in the united states mail box, portends that you will be held responsible for the wrongdoing of others.
Illegal business or transaction is terminated in Jesus name. I shall not be held responsible for a crime that I did not commit in Jesus name.
Say: Allahummo akfina bi halaalika an haraamika. Robbi unsurniy bimo kassabuniy 21. Wallahu khaeru rusziqeena 21. Wallahu yasimuka minan naasi 21 for 7 days.