Free Postage (USPS)

Simply switch he "To:" and "From:" addresses on the letter and drop it off at the mailbox. Put your address at the "To:" field and the addressee's address in the "From:" field. When the mail-carrier notices that there is no postage stamp they will label the letter RTS (return to sender). The letter will then be sent to the address in the "From:" field.

Note: The mail carrier might not be that generous so don't send anything too valuable and keep the addresses within the same city or so. Either way it's worth a try.

*Share to save someone postage.