You should always put the name and address on the envelope. Even if the machine reads it right, the letter carrier isn't a machine and would still need that info. If the machine mis-reads the zip plus 4 it would be a long time before this piece of mail shows up. If you go to the USPS web site and enter your address it will tell you whether it is right or not and correct it if need be. Don't go by what is on GPS.
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