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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.
Envelopes. 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 waterproof envelopes.
Letter envelopes for international mail can be 11-1/2" long x 6-1/8" high. (A standard No. 10 envelope is 9-1/2" long x 4-1/8" high.) You can fold what you put in your envelope, but it needs to stay flat—no more than 1/4" thick.
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Sizes for Letters. You probably have a picture in your mind of what a "letter" is. Possibly you're using a standard No. 10 envelope for your letter, so that's easy to picture.
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Attention Line. The Attention Line is placed above the Recipient Line, that is, above the name of the firm to which the mailpiece is directed.
The address, return address and postage should all be on the same side of the package. (If it's improperly addressed, it might get returned to you). Print or type your address in the upper-left corner on the front of the envelope.
The delivery address is the most important information on your mailpiece. Use the following format for your delivery addresses:
You're sending a letter envelope (under 3.5 oz) or large envelope (under 13 oz) that's flat and bends easily. You're sending only books (or other eligible media) and want the most affordable price. Compare All USPS Domestic Mail & Shipping Services