What is the weight limit for standard mail letters?

The weight limit for standard mail letters is actually 1 ounce. This is an important detail in the context of postal regulations, particularly when determining postage rates and classification for sending mail. Standard letters must adhere to the specified weight limit in order to qualify for certain postal services and rates. Overstepping this limit can result in additional charges or the need to use different mailing options. Understanding this limit helps ensure that mail is processed smoothly and meets postal guidelines effectively.