The United States Postal Service (USPS) sets the regulations for all mailboxes, including brick structures. Make sure to check with your local post office since they keep track of any ordinances or other regulations in your area that govern mailbox use and installation. Keep in mind that one of their biggest concerns includes the prevention of a safety hazard to the mail carrier while placing mail in the container.
All mailboxes, including curbside and house-mounted containers, must meet specifications created by the USPS. Since brick mailboxes tend to fall outside of these regulations, you need approval from your local postmaster before installing the structure, even if you plan to replace an older mailbox. The local post office usually approves the mailboxes on a one-time basis as long as they generally meet USPS standards.
A few rules apply to all mailboxes, whether made from brick or other materials. The name on the mailbox must be at least 1 inch in height so that the lettering remains easily read by the carrier. Mailboxes with locks need approval by your local postmaster and require a slot large enough to receive your daily mail. If the box is mounted near your front door or on the house, it needs to provide adequate protection and security for the mail. It is also your responsibility to maintain a clear path to both curbside and house-mounted mailboxes so that the carrier can safely and efficiently deliver your mail.
As you plan for your brick mailbox, keep in mind that all curbside mailboxes need an opening for mail delivery that sits 41 to 45 inches from the road surface. If road or curb conditions prevent this, check with your local postmaster about other options. You also need to install the mailbox 6 to 8 inches from the front of the road or curb edge to the mailbox opening. Make sure to install the mailbox on the right-hand side of the road and in the carrier's direction of travel. This prevents traffic law violations and minimizes any traffic hazards. Plus, these regulations give the mail carrier easy access to place the mail in the mailbox.
To add a receptacle for newspaper delivery, a few regulations apply. The receptacle may not touch the mailbox or use it for any type of support. You can use the brick structure around the box to attach the receptacle, but it cannot interfere with delivery of the mail. The container can not block the view of the mailbox flag or cause a hazard to the mail carrier or their vehicle. The only advertising allowed on the receptacle includes the name of the publication.