This document provides guidelines for printing addresses on mail items. These guidelines apply to addresses printed on mail items whose size is up to and including C5. It may also be applied to oversize items, commonly referred to as C5+. The address blocks covered are the addressee address block and the sender address block if they are both on the same side of the item. Otherwise, only the addressee address block is covered. Guidelines related to address lines are relevant for all lines in an address block.