I once sent a letter to the Polish embassy in New York City. I got the street number wrong. It came back many weeks later stamped as undeliverable because the a

I once sent a letter to the Polish embassy in New York City. I got the street number wrong. It came back many weeks later stamped as undeliverable because the address does not exist. I remember reading or watching something ages ago about how the US postal service has a special office for deciphering non-standard addresses to ensure delivery. I think they were on a company retreat when my letter was passing through.