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Architectural Mailboxes

Model # 5103B

Internet # 100652317

Oasis Black Post-Mount or Column-Mount Locking Drop Box

This item has been discontinued.
The Home Depot no longer carries this specific product.
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$175.00 /each




Model # 5103B

Internet # 100652317

Store SO SKU # 426672

Ideal for commercial applications, the Architectural Mailboxes Oasis Post-Mount Locking Drop Box sports a high-capacity space with a hopper door for easy delivery of mail bundles, small parcels or payment drops. The retrieval doors feature rubber seals to keep deliveries dry and free of dirt, and the drop box is constructed from 16- and 14-gauge galvanized steel with a powder coat finish for lasting durability.

  • (13-7/10 in. W x 20 in. H x 18-1/2 in. D) offers ample room for small parcels, mail bundles or money drops
  • Constructed of heavy-gauge, galvanized stainless steel for optimal durability
  • Commercial grade powder coated finish resists rust
  • Doors include rubber seals to keep deliveries clean and dry
  • Works with Architectural Mailboxes' 5105 and 5106 posts (not included)
  • Post-mount installation for ease of access
  • Works with 5120OC5100 and 5120WL5100 locks and 5140 key blanks
  • Use universal adapter plate 5530B for 4x4 wood post installation
  • Does not include mail flag, outgoing mail clip, or USPS embossing

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 


Rated 4.9 out of 5 by 8 reviewers.
Rated 4.0 out of 5.0 by Drop box conversion to mailbox Really wanted this size box to replace our mailbox (from a Home Depot store) that had been hit by a car; we appreciate delivery to our rural home. Only the drop box was available, but a trip to our small town hardware store enabled us to convert it to a large locking mailbox with the purchase of a flag, numbers, and clip to hold outgoing mail. March 25, 2015
Rated 5.0 out of 5.0 by Great Column Mailbox All in all, I am quite happy with his mailbox. I have it mounted within a column and it is working great so far. Please note, it is quite large and I would definitely not want this mounted curbside, atop a mailbox post at my house. Unless you need it, choose the smaller size. I like sheer amount of mail that this size can hold. It fits very well into a 2'x2' column. I have yet to try it with packages, but it is definitely big enough, that many small packages should be able to fit. The construction and materials appear to be good. Time will tell, but overall I am quite happy thus far. For the price, I couldn't' be happier. June 26, 2012
Rated 5.0 out of 5.0 by heavy duty mailbox is heavy to say the least. it is very well constructed. the only thing is that it did not have a rear hatch. we had our welder modify it a little and added a rear hatch. the welder himself was very surprised at how heavy the box was and advised us that it was very thick metal for a mailbox. the mailbow is big enough to receive shoe box size packages. it is also difficult for someone to get the mail unless you open the rear hatch. May 29, 2012
Rated 5.0 out of 5.0 by Larger size...great secure storage room for lots of mail I was looking for a quality, lockable mailbox that would go into my existing brick mailbox holder. The larger size Oasis is excellent quality and my brick guy agrees. Wanted the larger size since it is able to store larger mail as well as routine mail. May 30, 2014
Rated 5.0 out of 5.0 by Perfect for one who gets lots of mail. Size great as we get many magazines and books. Secure feeling to know that your mail is safe. Drop down feature easy for mailman. Easy mail retrieval at a good height - no stooping over. Key glides in and out easily. March 21, 2012
Rated 5.0 out of 5.0 by New Mailbox The product was exactly as advertised on the website. It arrived in less than one week from purchase at the store selected for pickup. The store associate loaded it into my car within ten minutes of arrival at the store. I couldn't be more pleased with Home Depot. June 17, 2014
Rated 5.0 out of 5.0 by We just had it installed in brick for our mailbox but so far we really like it. We ordered this mailbox and it arrived at our house really quickly. postage free. The mailbox is exactly how it was described online and Home Depot had the best price that we found. We are replacing a mailbox that had totally disintegrated and this metal seems so much more sturdy. And because it has a locking feature, we will be able to not worry about our mail if we go out of town for a long weekend. March 14, 2013
Rated 5.0 out of 5.0 by Perfect for small to medium packages and mail load. Fits perfectly into a two-foot wide column mount. Large door and anti-theft feature a real plus. Large bin will hold a significant amount of mail without worrying about overflow. Bronze color was just what I was looking for. Built to last. I am a happy customer. May 28, 2014
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