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Internet # 322705863

Model # 523200

Atherton Resin Overpost Extra Large Black Onyx Mailbox and Black Onyx Mail Post Combo

$189.97
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  • Classic molded detailing enhances the visual appeal
  • Made of weather-resistant resin to ensure longevity
  • Spacious capacity for ample mail and packages
  • View More Details

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Product Details

About This Product

Make the best first impression of your home with the Atherton Onyx Black Mail Post and XL Black Mailbox, an elegantly-styled mailbox and post cover featuring a classic wood millwork appearance without the maintenance required of real wood. This stately post and the extra-large, uniquely-durable coordinating mailbox and smartly-designed paper chute, combine to meet your mail delivery needs while making a lovely enhancement your home's curb appeal. The beauty and transitional style of the Atherton Mailbox and Post will welcome you home for many years with its high-quality construction and classic molded detailing for a mailbox and post aesthetic worthy of any estate.

Highlights

  • High-quality resin retains its beauty for years, withstanding inclement weather with no need for painting, sanding or staining
  • Recessed panels, crown molding and crisp corners give this sturdy resin post the authentic look of crafted wood
  • Extra-large capacity holds days' worth of mail and even small to medium-size packages, dependable magnetic closure
  • Strong stainless steel support plate prevents mailbox sag that is common with other posts
  • Return Policy

Product Information

Internet # 322705863

Model # 523200

Specifications

Dimensions: H 59.75 in, W 8.125 in, D 24.25 in

Dimensions

Assembled Depth (in.)

24.25 in

Assembled Height (in.)

59.75 in

Assembled Width (in.)

8.125 in

Details

Access Type

Front Only

Assembly Required

Yes

Color Family

Black

Features

Decorative, Outgoing Mail Indicator

Hardware Color Family

Silver

Included

Assembly Hardware, Handles, Newspaper Holders/Receptacles

Mailbox Capacity (cu. in.)

4760

Mailbox Size

Extra Large

Mailbox Style

T4

Material

Plastic

Mount Type

Post Mount

Post Installation Type

Fits Over 4x4

Post Material

Wood

Product Weight (lb.)

10.85 lb

Returnable

90-Day

Security

Non-Locking

Weight Capacity (lb.)

50

Warranty / Certifications

Manufacturer Warranty

Limited 2 year

U.S. Postmaster General Approved

Yes

Questions & Answers

Will it work with a Plastic resin post?
ByNov 6, 2025
1 Answer | 
Answer This Question

Thank you for your question! Yes, the included plastic resin post is designed to fit over a standard 4 in. × 4 in. wooden post, which provides the structural support for the mailbox. It is not intended to be installed as a standalone post.

By|Jul 31, 2026


    Does it come with the numbers? If not, what size/type do you recommend?
    ByJul 15, 2025
    1 Answer | 
    Answer This Question

    The Atherton Resin Overpost Extra Large Mailbox and Post Combo does not include mailbox numbers in the package. For best results, we recommend using self‑adhesive vinyl numbers that are at least 1 inch tall, which adhere well to the resin surface. Many consumers choose reflective vinyl numbers for better visibility at night. If you would like a more permanent option, you can also use weather‑resistant stick‑on numbers that are designed for outdoor use on mailboxes.

    By|Aug 6, 2025


      does this item come with a wooden post in the assembly box
      ByFeb 22, 2025
      1 Answer | 
      Answer This Question

      Hello! No, the post and mailbox does not come with the 4x4 wood post. You will need to purchase a standard 4" x 4" wood post cut to 65-75 inches in length. Refer to the product manual for assembly instruction and proper post installation. Best regards, Step2 Consumer Service

      By|Feb 1, 2026

        (2)

        does this item come with a wooden post in the assembly box
        ByFeb 22, 2025
        1 Answer | 
        Answer This Question

        Hello! No, the post and mailbox does not come with the 4x4 wood post. You will need to purchase a standard 4" x 4" wood post cut to 65-75 inches in length. Refer to the product manual for assembly instruction and proper post installation. Best regards, Step2 Consumer Service

        By|Feb 24, 2025


          IS THIS PLASTIC?
          ByJun 20, 2024
          1 Answer | 
          Answer This Question

          Thank you for contacting Step2. Yes it is plastic - made of polyethylene. Regards, Step2 Consumer Service

          By|Jun 20, 2024


            What are the dimensions of each individual mailbox? Dimensions of mailbox opening?
            ByJun 7, 2024
            1 Answer | 
            Answer This Question

            Thank you for contacting Step2. You can find all our mailbox dimensions and features on our website at www.step2.com Regards, Step2 Consumer Service

            By|Jun 8, 2024


              Viewing 1-6 of 6

              Customer Reviews

              4.6 out of 5

              • 4.6 out of 58 reviews
              • 95% recommend this product
              Filter by:
              Showing 1-10 of 58 reviews
              Love it!!
              Love how this looks. So easy to install and looks great!
              by
                • Recommended
                Easy to assemble, looks great,
                Easy to assemble, looks great, matches our light post and our front porch scheme.
                by
                  I went from having the worst mailbox on my daughter in law’s mail route to the best and definitely the largest mailbox.
                  by
                  • Verified Purchase
                  This customer chose to rate the product and not provide text.
                  by
                  • Verified Purchase
                  This customer chose to rate the product and not provide text.
                  by
                  • Verified Purchase
                  Did not receive the kit. Just the mailbox itself. Customer service was awful
                  by
                  Response from Official Step2 BrandMay 7, 2026
                  Hello. We are sorry and apologize about your issue. Please contact us at 1-800-347-8372 Monday – Friday between 8am and 5pm EST or email us at STEP2-COMPANY@STEP2.NET so that we may assist you in finding a resolution to your satisfaction including sending any necessary replacement parts at no charge with proof of purchase.
                  Regards,
                  Step2 Consumer Services TheOfficialStep2Company
                  • Verified Purchase
                  This customer chose to rate the product and not provide text.
                  by
                  • Verified Purchase
                  This customer chose to rate the product and not provide text.
                  by
                  • Verified Purchase
                  Looks good but not designed well for snow storms
                  The design of this mailbox is not the best. The very first snow storm a town plow went by and the snow took the box right off the post by just the snow hitting it. I redesigned how it mounted myself and it is allot more secure now.
                  by
                  • Verified Purchase
                  This customer chose to rate the product and not provide text.
                  by
                  • Verified Purchase
                  Showing 1-10 of 58 reviews

                  Compare Key Features

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                  Product Snapshot

                  Perfect for upgrading your home with a classic wood millwork appearance mailbox, adding style and functionality.
                  Perfect for upgrading your home with a classic, extra-large mailbox. Durable resin construction ensures weather resistance and lasting beauty.
                  Ideal for homeowners seeking a large, rust-resistant mailbox with free custom address plaques. Upgrade with this stylish and functional mailbox.
                  Ideal for homeowners seeking a large, rust-free aluminum mailbox with free personalized plaques. Upgrade your curb appeal with this stylish and secure mailbox.

                  Mailbox Capacity

                  4760 cu. in.
                  4760 cu. in.
                  6636 cu. in.
                  6636 cu. in.

                  Package Delivery Compatibility

                  Weather Resistance

                  Locking Mechanism

                  Rust-Resistant