Which type of mail includes all correspondence, whether hand written or typed, all bills, and all materials sealed against postal inspection and weighing 13 ounces or less?

Question

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First class mail includes all correspondence, whether hand-written or typed, all bills, and all materials sealed against postal inspection and weighing 13 ounces or less. This category is designed for standard letters, bills, and other similar items.

Which Type of Mail Includes All Correspondence, Whether Hand Written