If your letter is heavier than 1 ounce, rigid, or lumpy (containing items like coins), it may require a non-machinable surcharge or additional stamps.
Clearly write the recipient's full name, street address (including apartment or suite number), city, state, and ZIP code in the middle of the envelope.
Use Global Forever Stamps for international destinations, as standard domestic stamps will not be enough. 4. Send Your Letter Once sealed and stamped, you can send your letter by: Dropping it into a blue USPS collection box.
Standard letters include a formal or casual salutation, the body of the message, a polite closing (e.g., "Sincerely" or "Best"), and your signature. 2. Address the Envelope
Taking it directly to a Post Office counter, which is recommended if you need proof of mailing (Certified Mail) or aren't sure of the required postage. How to Mail a Letter | National Postal Museum
Use a pen or type your message. Typed letters are preferred for formal business or legal communication, while handwritten notes offer a more personal touch.
Include your own full name and address in the top-left corner. This ensures the letter can be returned if it cannot be delivered.