Yes, you can easily install a new mailbox on an existing post. Whether you are screwing a new metal or plastic box onto a wooden post, adding a mounting board, or using a decorative sleeve that fits over your current setup, it takes just a few basic tools.
The red flag on a residential mailbox is a carrier signal flag. When raised, it alerts your mail carrier that you have outgoing mail inside the box that needs to be picked up. If the flag is down, carriers typically won't stop at your house unless they also have incoming mail to deliver.
Position your mailbox 41″ to 45″ from the road surface to the bottom of the mailbox or point of mail entry. Place your mailbox 6″ to 8″ back from the curb. If you do not have a raised curb, contact your local postmaster for guidance. Put your house or apartment number on the mailbox.
Important: Before installing, moving or replacing your mailbox or mailbox support, you will need to contact your Postmaster or mailperson from your local Post Office™. All mailboxes must be approved by the Postal Service™. Custom made mailboxes will be approved by the Postmaster if they meet established standards.
You might find a dryer sheet in your mailbox because your mail carrier placed it there to deter stinging insects like wasps, hornets, and yellowjackets from building nests inside. The strong aromatic fragrance of the sheet acts as an effective, non-toxic repellent that keeps pests out and protects the carrier from painful stings when reaching inside.
In the USPS, the "7:01 rule" dictates that if a regular city letter carrier works more than 7 hours but less than 8 hours, and is officially excused by their supervisor, they are credited with a full 8 hours of work time for pay purposes.
The USPS is removing or sealing some traditional blue collection boxes primarily to combat mail theft and protect postal workers. Criminals have increasingly targeted these boxes—often using stolen master keys to access them and steal checks or sensitive mail. In areas with high crime rates or low usage, the boxes are being removed entirely or upgraded to high-security models with narrow slots instead of pull-down handles.
Postal Operations Manual (POM) 632.6 specifies postal regulations regarding locations for apartment houses and other multiple unit dwellings. On new rural and contract delivery service routes, all mailboxes must be on the right-hand side of the road in the direction of the route line of travel.
Yes, a postal carrier can refuse to deliver mail if a mailbox is blocked by vehicles, trash cans, or snow, as they require safe and clear access, generally about 15 feet on each side of the box. While carriers are supposed to attempt delivery for temporary obstacles, they can stop delivery if the blockage is a recurring issue.
Letter carriers can pick up mail as they make their deliveries if the flag is up. However, carriers are not required to check mailboxes for outgoing mail that do not have flags up if they do not have deliveries for that address that day. It falls within the size and weight restrictions of the class.
Thieves with stolen postal keys loot the locked, blue collection mailboxes which are usually stationed outside of post officers or in residential public spaces. Once inside the mailbox thieves target letters with checks or money orders, altering them to steal from personal and business accounts.
The Postal Service offers no-fee post office (PO) box service to customers who do not receive any form of carrier delivery. Customers apply for the no-fee PO box service by completing an application and providing identification to a Postal Service employee.
Pros and cons
A UPS mailbox can be a suitable choice for your business, as it offers: A real street address: The UPS Store provides an actual street address you can use as your business address. Affordability: While more expensive than a USPS P.O. Box, a UPS mailbox is still quite cost-effective ($10 to $50 per month).
Yes, setting a mailbox post in concrete is highly recommended. It provides maximum long-term stability, prevents the post from leaning due to weather changes, and keeps it firmly upright against strong winds or heavy rain.
Placing a dryer sheet in your mailbox to ward off unwanted insects is a widely shared tip, but it's not a reliable way to keep pests out. While strong scents can sometimes discourage insects, they don't address what attracts them in the first place.
In hot and sunny climates, metal mailboxes resistant to UV damage are preferable, as some plastics may fade or become brittle under prolonged sun exposure. Plastic mailboxes offer rust and water damage resistance, making them a rust-resistant mailbox option for areas with frequent rainfall.
Mailbox Height and Placement Rules
There must be 41 to 45 inches of height from the street up to the bottom of your mailbox door. The mailbox door must be 6 to 8 inches from the curb when closed.
It's a relay box. Basically, all of the mail for that section is dropped off and the carrier picks it up in a carry-able amount, delivers it, goes back for another carry-able amount, etc. until it's all delivered.
PostNord, Denmark's state-run postal service, officially ended all letter deliveries at the start of the new year, citing a more than 90% decline in volume from 2000 to 2024. The Nordic nation is believed to be the only country in the world to discontinue its letter deliveries, though package distribution is ongoing.
Most Post Office™ retail locations provide free Priority Mail® and Priority Mail Express® packaging supplies for customer pick-up. USPS-produced packaging is not eligible for shipping mailable hazardous material or live animals.
As of May 22, 2026, the average annual pay for a Senior Mail Carrier in the United States is $80,287 a year.
You should tip your mail carrier up to $20.
The USPS 12-and-60 Rule dictates the maximum working hours for full-time employees, stating that they may not work more than 12 hours in a single service day or 60 hours in a single service week.