For example: Articles presented for mailing must be prepared under the general and specific standards in this document.
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There are five mail processing categories for mailpieces: letter, flat, machinable parcel, irregular parcel, and nonmachinable parcel.
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If the length (the dimension parallel to the address) of a letter-size mailpiece is not at least 5 inches, it is nonmailable.
Basic Standards For All Mailing Services
If the heht (the dimension perpendicular to the length) of a letter-size mailpiece is not at least 3-1/2 inches, it is nonmailable.
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