Architectural Mailboxes

Model # 5100W

Internet # 100026384

Oasis Post-Mount or Column-Mount Locking Mailbox in White with Outgoing Mail Indicator

$240.62 /each
Color: White
  • Beige
  • Black
  • Bronze
  • Pearl Gray
  • White



Model # 5100W

Internet # 100026384

Store SO SKU # 426672

The Architectural Mailboxes Oasis Post-Mount Mailbox is a locking curbside mailbox that is approved by the US Postmaster General. Its body is constructed of heavy 14- and 16-Gauge galvanized steel and has a powder coat for durability and long lasting use. The incoming hopper and mail retrieval doors include rubber seals to help keep deliveries clean and dry. All hardware is made from stainless steel and other corrosion resistant materials. A stainless steel cam lock with 2 keys is included. This mailbox comes with installation instructions to help make that process easier.

  • Large capacity for accommodating larger amounts of mail, catalogues and small packages
  • Locking access door with stainless steel cam lock and 2 keys for security
  • Constructed of heavy 14 and 16-gauge galvanized steel for durability and long lasting use
  • Outgoing mail clip installed discretely inside hopper door
  • Hopper door for delivery of small parcels and mail bundles
  • Rubber seals inside hopper and mail retrieval doors to seal out the elements and keep deliveries clean and dry
  • Stainless steel hardware
  • Matching in ground or surface mount post sold separately
  • Approved by the US postmaster general
  • 1-piece outer shell construction to prevent infiltration of moisture and the elements
  • Use universal adapter plate 5530W for 4 x 4 wood post installation
  • Includes installation instructions
  • Works with 5120OC5100 and 5120WL5100 locks and 5140 key blanks
  • Item weight is 36.5 lb

Info & Guides

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Assembled Depth (in.) 
18.50 in 
Assembled Height (in.) 
20 in 
Assembled Width (in.) 
13.7 in 
Assembly Required 
Color Family 
Hardware Finish Family 
Letters/numbers included 
Mailbox Size 
Galvanized Steel 
Newspaper receptacle 
Outgoing mail indicator 
Rear access 
Single Box Type 
Post Mount 
Warranty / Certifications
Manufacturer Warranty 
One Year Limited Warranty 
U.S. Postmaster General approved 


Lockable: Yes
Hardware Finish Family: White
Material: Galvanized Steel
Brand: Architectural Mailboxes
Price: $200 - $250
Review Rating: 4 & Up


Rated 4.7 out of 5 by 47 reviewers.
Rated 5.0 out of 5.0 by best consumer mail box that I found after searching several sites Easy to install but you need to research the appropriate post to put it on. I made my own using a 4x4 that I covered with a vinyl fence post sleeve and a 3/4" ply wood base. I spoke to my mailman and he gave me some helpful hints (weather issues) for the area we live in that may affect your choices of a mail box. Also, search the web for prices as I went onto the Lowes' web and almost got ripped-off as compared to HD. December 8, 2015
Rated 5.0 out of 5.0 by Wrong size Not being able to see item in person makes it difficult to make a selection. After receiving this and comparing to one we have, the new one would not be an increase in amount of mail it could hold. So we returned item and are still looking. December 29, 2015
Rated 5.0 out of 5.0 by Very secure! This is a fantastic mailbox. It is very solid and works just like a USPS curbside mailbox. The hopper is large enough to hold medium-sized packages. The mailbox is well constructed. I expect that it will last indefinitely. When placed in the hopper, mail falls into a large "storage" area that is accessible only by using a key. Literally the only way that mail could be stolen is if a thief steals the entire mailbox. Also, there is enough room in the storage area for about two weeks of mail (assuming that you get what I would consider an average amount of mail every day). January 23, 2007
Rated 5.0 out of 5.0 by Fixed a problem I have a home that is rural, and we order a lot from ebay. My mailman is very grumpy about bringing packages to the door, and he would often try to cram items into our normal sized mailbox. He often damaged items that I'd purchased. When we would complain, he made it clear that he doesn't feel he has to come to the door and that if it doesn't fit in the mailbox, he may not deliver it at all. So, we purchased this oversized mailbox and mounted it by the curb. Now, he can fit a lot more stuff in there without damaging it. There is still some stuff that he has to bring up the driveway, but it is no longer a daily event, and he is 50% less surley. The mailbox itself is very solidly built. It seems to be a sturdier construction than what I've seen at apartment complex mailboxes or other industrial settings. It locks securely. July 10, 2012
Rated 5.0 out of 5.0 by Just What I Wanted! This is a very well constructed product that performs just as described here on the website. Although I live in town I wanted a large mailbox that could be locked because I receive my prescription drugs though the US Mail, and also to protect against the possibility of theft of medications or of financial documents. It has been in use for two months now and I could not be more satisfied with a mailbox as I am with this product from Oasis. Home Depot also carries a smaller version that a neighbor up the street from me has, but I wasn't sure it would be large enough for my needs. This is more than twice as large and is made of a heavier grade of steel. This product was more expensive than I wanted to spend and I thought about it for about two weeks before ordering it. I'm glad because the price dropped by 15% during that time, lucky for me. However, now that I have it I can tell you that in my opinion it is worth the list price. I made my selection based upon the reviews of users of this website. They were overwhelmingly positive and I'm glad I listened. I expect to be using this for the next 25-30 years. I also purchased the Oasis post for this mailbox and it was a breeze to install, and I'm not the handiest or terribly experienced at doing something like this. The quality of this mailbox and the post are both excellent! March 12, 2014
Rated 5.0 out of 5.0 by Oaisis Locking Mailbox/White My parents have this same mailbox because someone was taking their magazine out of their box. The box solved that problem. It also looks way better than their old, ratty and rusted box. You can see the white box easily and it's great for giving directions to your home. For what it's worth, it's a classy, expensive looking malbox. Think about it -- it is really the first thing people see when coming to your home. September 30, 2010
Rated 5.0 out of 5.0 by This is the best mailbox ever. It is secure and sturdy. Before we bought the box our packages were often left unattended on our porch and our magazines were folded sometimes ripped and often wrinkled. Now our pakages and magizines are dropped safely into the unit unharmed. May 29, 2006
Rated 5.0 out of 5.0 by Product as described well made good value Easy to install well made for commercial use good buy May 27, 2015
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