Most mail is sorted by barcode-reading machines these days. In addition to lining out your name and address with ink, completely obliterate the first inch or so of the barcode below your address on (or in) the envelope before returning it to the post office. (Simply crossing out the barcode will not work: the machines can still read it.) If it's first-class mail, be sure to write "Return to sender" on the front of the envelope, too.

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