USPS shows you how to send a letter or postcard in the U.S., from choosing an envelope, writing the address, buying and applying stamps, and finding a drop-off location.

Pack of 10 15" (L) x 11-5/8" (W) $0.00 Priority Mail® Forever Prepaid Flat Rate Padded Envelope Includes Customer's Return Address 12-1/2" (L) x 9-1/2" (H) $12.85

Pack of 10 10" (L) x 5" (H) $0.00 Priority Mail® Forever Prepaid Flat Rate Legal Envelope Includes Customer's Return Address 15" (L) x 9-1/2" (H) $12.10

First-Class Mail is a fast, low-cost way to send envelopes and postcards. See First-Class Mail and Forever stamp prices for a letter and postcard.

Letters, bills, greeting cards, and other documents can be sent in standard white, manila, or recycled paper envelopes. Items needing extra protection can be sent in bubble-lined, padded paper, or …

Compare USPS shipping options like Priority Mail Express, Priority Mail, First-Class Mail, and USPS Ground Advantage to find the service that's right for you.

Welcome to USPS.com. Track packages, pay and print postage with Click-N-Ship, schedule free package pickups, look up ZIP Codes, calculate postage prices, and find everything you need for …

Filter by Product Type to get more specific product results. Filter products based on envelope type (e.g., standard, postcard, international, etc.).

Customers can be unpleasantly surprised that they must pay extra postage when, for example, they mail a square greeting card. The Postal Service charges extra postage because mailpieces that are rigid, …

Write a personalized response to the child’s letter and sign it “From Santa.” Insert both letters into an envelope, and address it to the child. Ensure a First-Class Mail stamp is affixed to the envelope.