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Yes, you do need stamps to mail a letter both for domestic and international routes. The number of letter stamps will depend on the weight, size and destination (domestic or international). Post offices require this proof that postage was paid to help them scan and orient the letter further.

Letters, large or thick envelopes, tubes, and packages containing mailable items can be sent using Priority Mail. This service is typically used to send documents, gifts, and merchandise. Select Priority Mail packaging is available at the Post Offices. All Priority Mail packaging can be ordered at .usps.com/store.

You need to go to a post office in person to send USPS Certified Mail®. At a post office or other mailing center, you can pick up copies of Form 3800 and attach them to your certified parcels yourself. You may also be able to print out certified mail labels online.

First-Class Mail® is an affordable mail service for standard-sized, single-piece envelopes weighing up to 3.5 oz and large envelopes weighing up to 13 oz. Prices start at $0.66 at a Post Office.

The USPS offers a service called Restricted Delivery, which guarantees that your mail is only delivered to the addressee. Restricted Delivery is designed for sensitive mail such as confidential legal documents, important contracts, classified documents, and high-value packages or papers.

Class Mail® Forever stamp costs $0.66 and goes in the upper right corner of the envelope. (You can also use any combination of stamps that adds up to $0.66.) If your letter is heavier or bigger, or if you want to add insurance or extra services like Certified Mail® service, you'll pay more.