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Address Valid : Indicate the length of time that you will receive mail at the mailing address just entered , by checking the " indefinitely " box , or by entering the last month and year you will receive mail there , in the spaces provided . Valid : Indicate the length of time that you will receive mail at the mailing address just entered , by checking the " indefinitely " box , or by entering the last month and year you will receive mail there , in the spaces provided .