Which factor is NOT included in the maximum dimensions for a postcard?

The maximum dimensions for a postcard typically include the physical measurements of length, width, and thickness. These three factors determine how a postcard must be designed to comply with postal regulations and ensure it can be processed and delivered efficiently. Length and width are crucial for defining the overall shape and size of the postcard, while thickness is significant because it affects how the postcard can be handled in automated postal sorting machines.

Weight, however, is not classified under maximum dimensions but rather as a separate criterion for mailing. While weight does impact postage rates and the class of mail for delivery, it does not directly relate to the physical dimensions of a postcard. Understanding this distinction is important for anyone handling postal items, as it influences how they prepare mail for sending, ensuring that it meets all requirements for size and also fits within postal service guidelines regarding weight for the corresponding mailing class.