Is there a website I could go to to try and confirm an address I have in the US? My daughter has a US penpal and has been sending letters back and forth for a couple of years now. Her last one came back as 'no such address'. She was just replying to her friends letter so I don't think in that brief period of time that the friend moved but of course my daughter threw out all envelopes so we have nothing to go by. I'm going to take it to my local post office this afternoon to see if they can help but I wondered if there was somewhere I could check myself first.