The nonmachinable surcharge is charged per piece and applies to letter-size pieces that meet one or more of the nonmachinable characteristics in .

Pieces mailed at the card price are not subject to the nonmachinable surcharge.

Text messaging, or texting, is the act of composing and sending electronic messages, typically consisting of alphabetic and numeric characters, between two or more users of mobile phones, fixed devices (e.g., desktop computers) or portable devices (e.g., tablet computers or smartphones).

While text messages are usually sent over a phone network, due to the convergence between the telecommunication and broadcasting industries in the 2000s, text messages may also be sent via a cable network or Local Area Network.

Advertisers and service providers use direct text marketing to send messages to mobile phone users about promotions, payment due dates, and other notifications instead of using postal mail, email, or voicemail.

The key or identification device must bear, contain, or have securely attached the name and complete address of a person, organization, or concern, with instructions to return the key or identification device to that address and a statement guaranteeing payment of postage due on delivery.containing digital images, videos, and sound content, as well as ideograms known as emoji (happy faces and other icons).As of 2017, text messages are used by youth and adults for personal, family and social purposes and in business, government and non-governmental organizations for communication between colleagues.Express all single-piece weights in decimal pounds rounded off to four decimal places.Keys and identification devices (such as identification cards and uncovered identification tags) that weigh 13 ounces or less may be returned at the applicable single-piece First-Class Mail parcel price plus the fee.Like e-mail and voice mail, and unlike landline or mobile phone calls (in which the caller hopes to speak directly with the recipient), texting does not require the caller and recipient to both be free at the same moment; this permits communication even between busy individuals.Text messages can also be used to interact with automated systems, for example, to order products or services from e-commerce websites, or to participate in online contests.