How to Send a Letter, Mailing a Letter makes mailing a letter easier than ever.

With, you have all the functions of the Post Office™ right on your desktop, including purchasing postage. We make it easy to send a letter by printing USPS postage, a delivery address, and a return address directly to your envelope. even checks your delivery address against the master USPS database, eliminating the hassle of letters being sent to an incorrect or undeliverable address.

When you print postage for a First-Class Mail® letter using, you automatically qualify for a postage discount that isn’t available at the Post Office. The USPS provides access to the “Metered Mail Rate” for all online postage vendors. The Metered Mail Rate is currently sixty-three cents cheaper than the First-Class Mail® rate at the Post Office (currently $0.73).

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How to Mail a Letter Using

Special Note:

The process described below is for printing postage directly on an envelope. can also print postage directly on adhesive labels (NetStamps®) with the labels being used exactly like regular postage stamps.

  1. Measure the dimensions of your envelope.
    Remember, even if your mailpiece is in a standard-sized envelope, it may not be classified as a letter. Bulky, square, or irregular-sized envelopes are not machinable, meaning they can’t be run through USPS’s automatic sorting machines. In these cases, you’ll have to pay a surcharge for the USPS to process your irregular mailpiece.

    example image of dimensions for an envelope

    USPS defines a letter by the following dimensions:

    Height: Between 3 ½ and 6 ⅛ inches
    Length: Between 5 and 11 ½ inches
    Thickness: No thicker than ¼ inch
    Weight: 3.5 ounces or lighter


  2. Weigh your letter.
    Place your envelope on the scale to ensure you have the correct weight before proceeding to the next steps. Letters heavier than 3.5 ounces should be mailed in Priority Mail® Flat Rate envelopes, which can accommodate up to 70 pounds.
  3. Verify Return and Delivery Addresses.
    In, click ”Envelopes“ in the navigation bar. Here, you’ll check that your Return Address and Delivery Address are correct to print. automatically runs all addresses through the USPS database to ensure correct street names, directional information, and ZIP codes are accurate for sorting and delivery. You can even add a company logo to your Return Address when printing directly on an envelope.
  4. In the “Mailpiece” dropdown menu, select “Letters.” automatically sets the letter weight to 1 ounce, so if your piece weighs more than 1 ounce, input the actual weight here.
  5. Select your “Mail Class” and add any Special Services needed.
    Once you’ve input addresses and weight, you’ll be able to select a “Mail Class.” Most letters mailed in the U.S. use First-Class Mail® for delivery. You will also have the option of adding insurance and choosing a mailing date for the future (the default mailing date will be today’s date). In addition, the “Cost Code” feature appears if you choose to keep track of your postage expenses on
  6. Choose your envelope size in the “Print Details.”
    The “Printing On” dropdown will offer a variety of envelope sizes. Remember, a standard business envelope is #10 (4 ⅛ × 9 ½ inches).
  7. Preview and print your envelope.
    View your envelope in the “Preview” window before printing. We suggest using the “Print Sample” feature if this is the first time you’ve printed envelopes in your printer to ensure the print alignment matches. If the preview looks good, load your envelope into your printer and click “Print Postage.” If there’s a problem with printing, it’s fast and easy to reprint at no extra charge. Once your envelope has been printed, the postage value will be deducted from your account balance.
  8. Send your letter!
    Once printed, you can either drop your letter with postage in a USPS collection box (blue box on street corners) in your local neighborhood or hand the letter to your USPS mail carrier as they deliver your daily mail. You can also drop it off at any Post Office.

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