What is the minimum height for a letter?

The minimum height for a letter is established as 3 1/2 inches. This height is part of the specifications set by the United States Postal Service to ensure that mail is processed efficiently and can be sorted automatically. Letters must meet certain dimensional requirements to fit into the mail processing systems properly.

A letter that is 3 1/2 inches high is within the guidelines for letter mail, allowing it to be easily handled, addressed, and delivered. Letters must also meet minimum width and thickness requirements to qualify for standard letter postage rates. Understanding these specifications is vital for anyone working in postal services, as it helps to ensure compliance with postal regulations and prevents delays in mail processing.