Starting July 30th, 2012, these three countries will become the newest postal aware countries for shipments.
To speed international shipping enter the correct postal code for these three new postal aware countries. These countries will use the following formats; N = number
Czech Republic – NNNNN or NNN-NN
Hungary – NNNN
Poland – NNNNN or NN-NNN
Contact recipients to request this new information and update your address books.
Shippers using FedEx will be asked to enter the correct postal code in order to process their shipments to these countries.
https://www.ithaca.edu/intercom/article.php/20120724125729661