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  1. The Six Classes of Mail and Their Characteristics

    • #1 First-Class Mail
    • #2 USPS Marketing Mail (Standard Mail)
    • #3 Priority Mail Express
    • #4 Priority Mail
    • #5 Periodicals
    • #6 Package Services/USPS Retail Ground
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  3. 600 Basic Standards for All Mailing Services - Postal Explorer

  4. USPS Mail Class Guide, US Postal Service Mail Classes - Stamps.com

  5. Types of First-Class Mail® - USPS

  6. First-Class Mail - USPS.com

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

  7. Stamps.com - USPS First Class Mail Classification Tool

    Postage Help Center. First-Class Mail® Classification Tool. First Class Mail Shape Based Classification Tool. Determine if your mail piece is a Postcard, Letter, Large Envelope, or Package. For First-Class Mail®, USPS rates are …

  8. Mail & Shipping Services | USPS

  9. All the USPS Business Mail Classes Explained

    Sep 1, 2023 · We've included a breakdown of all the different mail classes below and a mail class chart so you can see the benefits at a glance! Let's dive into it: First-Class Mail ® Delivery in one to three business days. First-Class Mail is …

  10. How to Send a Letter or Postcard: Domestic - USPS.com

    How to Send a Letter or Postcard: Domestic. Domestic Letters | International Letters. Sending a letter with USPS ® is easy! Our video will help you with most letters and postcards you send domestically (inside the U.S.), including U.S. …

  11. Size and Shape - Postal Explorer

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