Yes you do if you don't it will come back to you.
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3 Just one stamp will do it for a normal letter.
The reason you need a stamp to mail a letter is because the stamp is the proof that you paid for your letter to be delivered. Instead of paying the mailman directly, and waiting for him to come to your house so you can pay the mailman to deliver your mail, the stamp proves that you paid for the delivery of the mail.
an address, a postage stamp and a letter to stick it to.
1
One ounce letter, one stamp.