Delivery within 3 working days
In almost all cases you will receive a track & trace code within 48 hours, unless a longer delivery time is stated on the product page. You can easily track your order with this track & trace code.
The timeless freestanding steel letterbox SafePost 70 red, the ultimate solution for your postal problems! Our letterbox is not only made of steel with a curved roof, but also has a large capacity that can accommodate several weeks of mail. Thanks to the insertion flap at the front and rear, you can also place the letterbox behind a fence or wall. In addition, this letterbox has an adjustable intermediate base for extra capacity, for example when you go on holiday.
Our letterbox is equipped with a solid cylinder lock with button and comes with 2 keys. With the button you can also open and close the door without using the key.
And the best part is, you don't have to worry about unsafe placement. The letterbox is supplied with mounting material for free-standing installation, including threaded rods and bolts for pouring into concrete, or you can choose to order one of the stands on which you place the letterbox.
Do you also feel so annoying when you have to be at home to receive mail? Order the timeless freestanding steel letterbox SafePost 70 red now and turn your postal problems into a problem-free solution!
Delivery within 3 working days
In almost all cases you will receive a track & trace code within 48 hours, unless a longer delivery time is stated on the product page. You can easily track your order with this track & trace code.
Delivery within 3 working days
In almost all cases you will receive a track & trace code within 48 hours, unless a longer delivery time is stated on the product page. You can easily track your order with this track & trace code.
The timeless freestanding steel letterbox SafePost 70 black, the ultimate solution for your postal problems! Our letterbox is not only made of steel with a curved roof, but also has a large capacity that can accommodate several weeks of mail. Thanks to the insertion flap at the front and rear, you can also place the letterbox behind a fence or wall. In addition, this letterbox has an adjustable intermediate base for extra capacity, for example when you go on holiday.
Our letterbox is equipped with a solid cylinder lock with button and comes with 2 keys. With the button you can also open and close the door without using the key.
And the best part is, you don't have to worry about unsafe placement. The letterbox is supplied with mounting material for free-standing installation, including threaded rods and bolts for pouring into concrete, or you can choose to order one of the stands on which you place the letterbox.
Do you also feel so annoying when you have to be at home to receive mail? Order the timeless freestanding steel letterbox SafePost 70 black now and turn your postal problems into a problem-free solution!
Delivery within 3 working days
In almost all cases you will receive a track & trace code within 48 hours, unless a longer delivery time is stated on the product page. You can easily track your order with this track & trace code.
Delivery within 2-3 weeks
Please note that the delivery time for the natural stone mailbox may be longer. This is because it is delivered directly from the supplier via their own courier service. The advantage of this is that no one has to be at home to receive the package.
The White KB023 Unibond black Bluestone mailbox is a beautiful, robust mailbox made of natural stone, perfect for both modern and classic homes. This letterbox combines elegance with durability and offers a safe and stylish solution for receiving your mail. With a lockable door at the back and a large storage compartment, this letterbox is both practical and a feast for the eyes.
Advantages of the De Witte KB023 Unibond black Bluestone Letterbox
Includes two keys: For extra security and convenience.
Theft-resistant: The solid natural stone construction and the lockable door ensure optimal security of your mail.
Weather-resistant: Made of high-quality natural stone, this letterbox can withstand all weather conditions and has a long lifespan.
Large storage capacity: With its spacious interior, the mailbox can store several days' worth of mail without becoming full.
Combination of strength and durability: The bluestone construction not only offers a beautiful aesthetic, but is also exceptionally durable and low-maintenance.
Placement of the De Witte Blauwsteen Letterbox
The White Bluestone mailbox is easy to install free-standing and, due to its robust weight and solid construction, can remain safely in place, even in bad weather conditions. The natural stone construction requires little maintenance, which means that the letterbox will remain in top condition for years to come.
Don't wait any longer, order it now and enjoy a combination of style, safety and sustainability in your front garden!
Delivery within 2-3 weeks
Please note that the delivery time for the natural stone mailbox may be longer. This is because it is delivered directly from the supplier via their own courier service. The advantage of this is that no one has to be at home to receive the package.
Delivery within 2-3 weeks
Please note that the delivery time for the natural stone mailbox may be longer. This is because it is delivered directly from the supplier via their own courier service. The advantage of this is that no one has to be at home to receive the package.
The White KB022 Bluestone mailbox is a beautiful, robust mailbox made of natural stone, perfect for both modern and classic homes. This letterbox combines elegance with durability and offers a safe and stylish solution for receiving your mail. With a lockable door at the back and a large storage compartment, this letterbox is both practical and a feast for the eyes.
Benefits of the De Witte KB022 Bluestone Letterbox
Includes two keys: For extra security and convenience.
Theft-resistant: The solid natural stone construction and the lockable door ensure optimal security of your mail.
Weather-resistant: Made of high-quality natural stone, this letterbox can withstand all weather conditions and has a long lifespan.
Large storage capacity: With its spacious interior, the mailbox can store several days' worth of mail without becoming full.
Combination of strength and durability: The bluestone construction not only offers a beautiful aesthetic, but is also exceptionally durable and low-maintenance.
Placement of the De Witte Blauwsteen Letterbox
The White Bluestone mailbox is easy to install free-standing and, due to its robust weight and solid construction, can remain safely in place, even in bad weather conditions. The natural stone construction requires little maintenance, which means that the letterbox will remain in top condition for years to come.
Don't wait any longer, order it now and enjoy a combination of style, safety and sustainability in your front garden!
Delivery within 2-3 weeks
Please note that the delivery time for the natural stone mailbox may be longer. This is because it is delivered directly from the supplier via their own courier service. The advantage of this is that no one has to be at home to receive the package.
Delivery within 2-3 weeks
Please note that the delivery time for the natural stone mailbox may be longer. This is because it is delivered directly from the supplier via their own courier service. The advantage of this is that no one has to be at home to receive the package.
The White KB021 wood look Bluestone mailbox is a beautiful, robust mailbox made of natural stone, perfect for both modern and classic homes. This letterbox combines elegance with durability and offers a safe and stylish solution for receiving your mail. With a lockable door at the back and a large storage compartment, this letterbox is both practical and a feast for the eyes.
Benefits of the De Witte KB021 wood look Bluestone Letterbox
Includes two keys: For extra security and convenience.
Theft-resistant: The solid natural stone construction and the lockable door ensure optimal security of your mail.
Weather-resistant: Made of high-quality natural stone, this letterbox can withstand all weather conditions and has a long lifespan.
Large storage capacity: With its spacious interior, the mailbox can store several days' worth of mail without becoming full.
Combination of strength and durability: The bluestone construction not only offers a beautiful aesthetic, but is also exceptionally durable and low-maintenance.
Placement of the De Witte Blauwsteen Letterbox
The White Bluestone mailbox is easy to install free-standing and, due to its robust weight and solid construction, can remain safely in place, even in bad weather conditions. The natural stone construction requires little maintenance, which means that the letterbox will remain in top condition for years to come.
Don't wait any longer, order it now and enjoy a combination of style, safety and sustainability in your front garden!
Delivery within 2-3 weeks
Please note that the delivery time for the natural stone mailbox may be longer. This is because it is delivered directly from the supplier via their own courier service. The advantage of this is that no one has to be at home to receive the package.
Delivery within 2-3 weeks
Please note that the delivery time for the natural stone mailbox may be longer. This is because it is delivered directly from the supplier via their own courier service. The advantage of this is that no one has to be at home to receive the package.
The KB019 bluestone mailbox is made of high-quality Belgian bluestone and guarantees stability, durability, and minimal maintenance. Thanks to its robust natural stone construction, the mailbox remains firmly in place and is resistant to all weather conditions. The sleek finish makes this natural stone mailbox suitable for long-term outdoor use.
Key Features
Solid bluestone mailbox
Made of Belgian bluestone/natural stone
Lockable back door for secure mail reception
Includes 2 keys
Weatherproof and low-maintenance
Suitable for freestanding installation
Installation and Maintenance
This bluestone mailbox is designed for freestanding installation in a garden or driveway. Due to its weight and closed construction, additional anchoring is generally not necessary. Maintenance is limited to simple cleaning with water.
Delivery within 2-3 weeks
Please note that the delivery time for the natural stone mailbox may be longer. This is because it is delivered directly from the supplier via their own courier service. The advantage of this is that no one has to be at home to receive the package.
Delivery within 2-3 weeks
Please note that the delivery time for the natural stone mailbox may be longer. This is because it is delivered directly from the supplier via their own courier service. The advantage of this is that no one has to be at home to receive the package.
The White KB015 wood look Bluestone mailbox is a beautiful, robust mailbox made of natural stone, perfect for both modern and classic homes. This letterbox combines elegance with durability and offers a safe and stylish solution for receiving your mail. With a lockable door at the back and a large storage compartment, this letterbox is both practical and a feast for the eyes.
Benefits of the De Witte KB015 wood look Bluestone Letterbox
Includes two keys: For extra security and convenience.
Theft-resistant: The solid natural stone construction and the lockable door ensure optimal security of your mail.
Weather-resistant: Made of high-quality natural stone, this letterbox can withstand all weather conditions and has a long lifespan.
Large storage capacity: With its spacious interior, the mailbox can store several days' worth of mail without becoming full.
Combination of strength and durability: The bluestone construction not only offers a beautiful aesthetic, but is also exceptionally durable and low-maintenance.
Placement of the De Witte Blauwsteen Letterbox
The White Bluestone mailbox is easy to install free-standing and, due to its robust weight and solid construction, can remain safely in place, even in bad weather conditions. The natural stone construction requires little maintenance, which means that the letterbox will remain in top condition for years to come.
Don't wait any longer, order it now and enjoy a combination of style, safety and sustainability in your front garden!
Delivery within 2-3 weeks
Please note that the delivery time for the natural stone mailbox may be longer. This is because it is delivered directly from the supplier via their own courier service. The advantage of this is that no one has to be at home to receive the package.
1 in stock
Voor 23:59 besteld, binnen 2 werkdagen geleverd
In almost all cases you will receive a track & trace code within 48 hours, unless a longer delivery time is stated on the product page. You can easily track your order with this track & trace code.
Do you regularly order online and are you fed up with missed deliveries, neighbors accepting packages, or boxes left on your doorstep? The Murus parcel mailbox in Corten steel is designed for people who want a permanent solution to this. No more hassle with delivery times, but instead control, security, and a sleek look for your home.
Always receive packages, even when you're not home
This parcel mailbox does exactly what you expect. Delivery drivers can safely deliver packages without you having to be present. This means fewer failed delivery attempts, no rescheduled deliveries, and no stress. Your packages are neatly stored until you retrieve them yourself.
Practical convenience for everyday life
Whether it's for online shopping, business deliveries, or regular deliveries, the Murus makes your address reliable for every delivery driver. A permanent location, a clear function, and immediate results.
The Corten Steel Process: Natural Protection and Character Formation
Corten steel is known for its high structural strength and self-protective properties. When exposed to the outside air, a stable rust layer forms that acts as a barrier. The Marun is delivered unrusted and develops its final color and patina in approximately six to twelve months. The process can be shortened to about two weeks with a rust accelerator.
Controlling the Rust Process
Once the mailbox is fully rusted, the use of a rust fixative is recommended. This stops the oxidation process and prevents the release of rust water. The fixative layer ensures a clean and low-maintenance result that retains its visual and functional quality for a long time.
Large Capacity Without a Bulky Design
With dimensions of 120 x 40 x 100 cm, this parcel mailbox offers ample space for daily deliveries. The maximum parcel size of 23 x 30 x 23 cm is designed for common parcel sizes. Large enough for practical use, compact enough to maintain a sleek appearance.
Well-thought-out proportions
Not excessively large, but maximum usability. The Murus stands out for its simplicity and clear function.
Securely lockable and immediately ready for use
The parcel mailbox comes with two keys, so you can use the lockable compartment immediately. Your parcels are out of sight and protected from unauthorized access and weather influences.
Peace of mind and security with every delivery
You always know where your parcel is. No surprises, no searching, and no risk.
A structural solution for online shoppers
The Murus parcel mailbox is designed for people who think ahead. For those who value convenience, safety, and appearance and are looking for a solution that's no longer temporary. This isn't an accessory, but a permanent improvement to your daily logistics.
A smart choice for today and a sustainable solution for the long term.
1 in stock
Voor 23:59 besteld, binnen 2 werkdagen geleverd
In almost all cases you will receive a track & trace code within 48 hours, unless a longer delivery time is stated on the product page. You can easily track your order with this track & trace code.
2 in stock
Ordered before 23:59, delivered within 2 business days
In almost all cases you will receive a track & trace code within 48 hours, unless a longer delivery time is stated on the product page. You can easily track your order with this track & trace code.
Do you also want all parcels to be delivered to your home without delay? This modern, attractive and freestanding mailbox with rear retrieval offers a practical and elegant solution for receiving your mail and parcels at home. Thanks to its design, the Pakun Anodic Bronze can be installed independently. This modern mailbox is a secure and future oriented solution for all your mail and parcels.
Because the lower compartment is very spacious, this mailbox can safely receive and store a large number of letters and parcels. This is also convenient if, for example, you are away on holiday.
How it works: The courier opens the flap at the front and places the mail and parcels inside. Once the flap is closed, the items slide down into the lower secured compartment where they are safely stored. When you want to retrieve your mail and parcels, you can do so at the back using your unique key. The opening is larger than with most parcel mailboxes, making it easy to receive the majority of your online orders.
Dimensions (LxWxH): 30 x 45 x 120 cmMaximum parcel size (LxWxH): 43 x 22.5 x 22 cmMaterial thickness: 2 mm
Warranty: We only sell mailboxes we truly believe in. That is why we offer a generous 90 day trial period and a 5 year warranty (when properly maintained).
Installation: The Pakun Anodic Bronze is equipped with four mounting holes. These holes have a diameter of 12 mm and are positioned in a 20 cm square. Mount the base plate onto a concrete pedestal (available at any DIY store), then secure it firmly with bolts from the top.
The advantages of the Pakun Steel with zinc coating:
Compatible with all parcel delivery services
Anti fishing mail slot prevents anyone from pulling parcels out
Allows you to receive approximately 75 percent of all parcel sizes
UV and frost resistant
Pre drilled mounting holes for secure installation
Receive multiple deliveries in one day
No more waiting for your parcels
Includes: 2 keys
2 in stock
Ordered before 23:59, delivered within 2 business days
In almost all cases you will receive a track & trace code within 48 hours, unless a longer delivery time is stated on the product page. You can easily track your order with this track & trace code.
1 in stock
Voor 23:59 besteld, binnen 2 werkdagen geleverd
In almost all cases you will receive a track & trace code within 48 hours, unless a longer delivery time is stated on the product page. You can easily track your order with this track & trace code.
De LitruCS2 is een cortenstalen brievenbus met zwarte voorplaat, met een afsluitbare deur aan de achterzijde. De brievenbus heeft een strak design dat zowel bij een moderne als klassieke woning past. De afmetingen van de brievenbus bedragen 30 x 40 x 100 cm (LxBxH) en weegt 25 kg.
Voordelen:
Inclusief twee sleutels
Diefstalbestendig
Eenvoudig te plaatsen
Combinatie van sterkte en duurzaamheid
Weerbestendig
Gemaakt van Cortenstaal klassa A met zwarte voorplaat
Cortenstaal is 2 mm dik
Plaatsing
De LitruCS2 is voorzien van een losse bodemplaat met 4 bevestigingsgaten. Deze gaten hebben een diameter van 12mm en staan op 20 cm van elkaar. Je bevestigt de bodemplaat op een betonnen sokkel. Vervolgens zet je de brievenbus erover en kun je hem met bouten aan de zijkanten vastschroeven. De laatste bouten worden meegeleverd.
Cortenstaal
Cortenstaal is een zeer sterk type staal die zich bij blootstelling aan de buitenlucht met een beschermende roestlaag gaat bedekken. Deze roestlaag vormt de bescherming tegen verdere corrosie. Kenmerkend voor cortenstaal is de bruinoranje roestkleur en de lange levensduur.
Roestproces
Cortenstaal is een zeer sterke staalsoort die zichzelf bedekt met een beschermende laag roest wanneer het aan de buitenlucht wordt blootgesteld. De brievenbus wordt altijd ongeroest geleverd en krijgt zijn mooie roestkleur/-laag als hij buiten staat. Dit proces duurt ongeveer 6 tot 12 maanden. Dit proces kan worden versneld tot 2 weken door de roestversneller te gebruiken. De roestversneller is terug te vinden onderaan deze pagina bij slim combineren.
Nadat hij volledig geroest is adviseren wij ook altijd om een roestfixeerder aan te brengen. Dit zorgt ervoor dat het roestproces stopt en hierdoor zal er ook geen roestwater van de brievenbus afkomen. De roestfixeerder is ook terug te vinden onderaan deze pagina bij slim combineren.
Bestel hem Nu!
1 in stock
Voor 23:59 besteld, binnen 2 werkdagen geleverd
In almost all cases you will receive a track & trace code within 48 hours, unless a longer delivery time is stated on the product page. You can easily track your order with this track & trace code.
2 in stock
Voor 23:59 besteld, binnen 2 werkdagen geleverd
In almost all cases you will receive a track & trace code within 48 hours, unless a longer delivery time is stated on the product page. You can easily track your order with this track & trace code.
Those who choose the Marun parcel mailbox in zinc-coated steel aren't looking for a standard solution, but a durable and secure way to receive parcels and mail flawlessly. This mailbox serves users who want to maintain control over their deliveries, without being dependent on delivery times or the risk of damage. Thanks to its solid steel construction, the tightly organized internal system, and a design that is both practical and aesthetically pleasing, the Marun offers immediate operational reliability in daily use.
Efficient and Separate Receiving of Parcels and Mail
The Marun is designed for users who require orderly and secure separation of parcels and letters. The internal compartment system prevents mixing, keeping documents clean and flat while parcels are stored separately. The front parcel door has a net opening of 36.2 by 30 cm. This allows for the hassle-free reception of parcels up to a maximum parcel size of 25 by 35.5 by 40 cm. The letterbox slot measures 25 by 6 cm and guarantees smooth entry of standard mail without the risk of blockages.
Functional design that eliminates daily friction
The two included keys ensure direct access and transparent control of the compartment. The robust construction with 2 mm thick steel ensures a long service life, even under intensive use and variable weather conditions.
Stable and precise placement
For reliable installation, the Marun is equipped with a separate base plate with four 12 mm mounting holes, strategically placed 20 cm apart. This configuration is designed for a tight connection to a concrete base and prevents micro-movements due to wind or frequent handling. The mailbox is placed over the installed base plate and then secured to the sides with the included bolts. This mounting system gives the end user certainty about the stability and durability of the structure.
Optimal work with a custom base
For situations requiring maximum precision, a concrete base is available specifically designed for this mailbox. The fit optimizes strength and minimizes installation time.
2 in stock
Voor 23:59 besteld, binnen 2 werkdagen geleverd
In almost all cases you will receive a track & trace code within 48 hours, unless a longer delivery time is stated on the product page. You can easily track your order with this track & trace code.
10 in stock
Ordered before 23:59, delivered within 2 working days
In almost all cases you will receive a track & trace code within 48 hours, unless a longer delivery time is stated on the product page. You can easily track your order with this track & trace code.
The Carta RAL 7016 is a steel mailbox from Geroba, with a lockable rear door. The mailbox has a sleek design that suits both modern and classic homes. It measures 30 x 40 x 100 cm (L x W x H) and weighs 25 kg.
Benefits:
Includes two keys
Theft-resistant
Easy to install
Combination of strength and durability
Weatherproof
Installation:The Carta RAL 7016 has 4 mounting holes. These holes have a diameter of 12 mm and are 20 cm apart. Attach the base to a concrete base (available at a hardware store). Then place the mailbox on top and bolt it to the top.
Order it Now!
10 in stock
Ordered before 23:59, delivered within 2 working days
In almost all cases you will receive a track & trace code within 48 hours, unless a longer delivery time is stated on the product page. You can easily track your order with this track & trace code.
737,95
Free delivery from €40
Rated 4.5 out of 5 on Trustpilot
Carefree returns up to 90 days!
Large Letterboxes – Spacious and Secure Mail Solutions
Looking for a large letterbox that can handle all your mail and parcels? At Doika, we offer an extensive selection of spacious and secure large letterboxes, perfect for both residential and commercial use. Choose from freestanding models, wall-mounted letterboxes, and parcel letterboxes designed to receive larger mail volumes and packages safely. Shop now and find the ideal solution for your home or business!
Why Choose a Large Letterbox?
Large letterboxes provide more than just extra storage space. They offer convenience and security for receiving a wide variety of mail and parcels, including:
High Capacity: Perfect for households or businesses that receive high volumes of letters, magazines, and parcels.
Secure Package Delivery: Parcel letterboxes allow safe and contactless delivery, even when you're not at home.
Weather-Resistant: Designed to protect your mail from rain, wind, and other weather conditions.
Stylish Designs: Available in modern and classic styles to complement any property.
Discover our full range of mailboxes and find the perfect match for your needs!
Types of Large Letterboxes at Doika
We offer a variety of large letterboxes to suit different requirements and preferences. Explore our most popular categories:
1. Freestanding Large Letterboxes
Freestanding letterboxes are perfect for driveways, garden paths, or entrances. These models are highly visible and provide easy access for both the postman and the homeowner.
2. Wall-Mounted Large Letterboxes
Save space with our wall-mounted letterboxes, designed to securely attach to any exterior wall or gate. Ideal for those who want a sleek and practical solution.
3. Parcel Letterboxes
Receive packages safely with our spacious parcel letterboxes. These models are designed to accommodate larger parcels and prevent theft or damage.
4. Built-In Parcel Letterboxes
For a seamless look, choose our built-in parcel letterboxes. These models integrate neatly into walls or fences, offering both security and a modern design.
5. Deluxe Large Letterboxes
Looking for something more luxurious? Our deluxe large letterboxes feature elegant designs with premium materials, adding a touch of sophistication to any property.
Materials and Finishes – Durable and Stylish
Our large letterboxes are made from high-quality materials that are both durable and stylish, including:
Corten Steel: Known for its unique rust-colored patina and exceptional durability.
Stainless Steel (Inox): Weather-resistant and modern, perfect for contemporary homes.
Galvanized Steel: Rust-resistant with a powder-coated finish for extra protection and style.
Aluminum: Lightweight and corrosion-resistant, available in sleek and minimalist designs.
Natural Stone and Blue Stone: Timeless and durable, ideal for classic or modern architectural styles.
Wood and Padouk Wood: Natural and rustic look, with excellent durability and weather resistance.
Want to learn more about our materials? Visit our Material Guide for detailed information.
Benefits of Choosing a Large Letterbox
Receive Parcels Securely: Safe delivery even when you're not at home, with secure locking systems for added protection.
Multiple Delivery Options: Compatible with all mail carriers and courier services.
Spacious Storage: Accommodate multiple deliveries, avoiding trips to the post office or collection points.
Stylish Appearance: Enhance your property’s curb appeal with sleek and modern designs.
Explore our parcel letterboxes for more information on receiving packages securely.
Frequently Asked Questions About Large Letterboxes
Are large letterboxes suitable for receiving parcels?
Yes, our large letterboxes are designed to securely receive parcels of different sizes, ensuring your deliveries are safe even when you're not at home.
How do I install a large freestanding letterbox?
Freestanding letterboxes come with all necessary mounting hardware and clear instructions, making installation quick and easy. Ensure the box is placed on a stable, level surface for optimal stability.
Which material is the most durable for outdoor letterboxes?
Corten steel, stainless steel, and galvanized steel are the most durable and weather-resistant materials, ensuring a long lifespan with minimal maintenance.
Do large letterboxes come with a lock?
Yes, all of our large letterboxes are equipped with secure locking systems to keep your mail and parcels safe.
Order Your Large Letterbox Online at Doika
Ready to find the perfect large letterbox for your home or business? At Doika, we make it easy to browse and purchase online. Choose from a wide selection of designs, materials, and styles, all with fast delivery to your doorstep.
Simply add your chosen mailbox to the cart, complete the checkout process, and receive your new letterbox within days. Shop our full range of large letterboxes today and enhance your property’s style and security!
A large mailbox offers plenty of space for letters, magazines, and parcels, ensuring you never miss a delivery — even when you’re not home. It’s ideal for both residential and business use.
What are the advantages of a large mailbox?
You can securely receive more mail and parcels without the box overflowing. It also reduces the need for frequent emptying, saving time and effort.
What materials are large mailboxes made from?
Large mailboxes are available in galvanized steel, aluminium, stainless steel, corten steel, and natural stone. Each material has its own benefits in terms of strength, maintenance, and appearance.
Are large mailboxes suitable for parcel deliveries?
Yes, many models feature a spacious parcel compartment with a secure lock, allowing couriers to deliver packages safely even when no one is home.
What should I consider when installing a large mailbox?
Place the mailbox close to the public road on a stable surface. Ensure it’s installed at the correct height (between 60 cm and 180 cm) and visible for the mail carrier.
