I just mailed a letter to my friend from out of state. When he told me his address he accidently told me that the zip code was 29560. The actual zip code is 29569. The last number that i put on the letter is a zero when it should be a nine. Everything like the address, town, and state are correct on the letter. Do you think my letter will still make it to my friend? Or will the wrong zip code make it get lost? Or maybe the letter will get returned to me? I'm really not sure. I mailed it before i figured out the right zip code. Any ideas on what will happen?