Salsbury Industries 4325BLK Roadside Mailbox Black 12.5 W x 13.625 H x 18.25 D in. 25 lbs

What this mailbox is and who it fits

The Salsbury 4325BLK is a USPS-approved roadside mailbox built entirely from aluminium with a black powder-coated finish. It serves homeowners who need a secure, locking box for daily mail delivery and who want both front and rear access doors. Each door includes a lock with two keys keyed alike. An outgoing mail tray and an adjustable red signal flag are integrated. It is not suited for buyers who want a non-locking thumb latch or a newspaper holder unless those accessories are purchased separately.

How it holds up in daily use

The aluminium construction and powder coating resist corrosion during prolonged outdoor exposure. Both locking doors stay aligned under repeated opening and closing cycles. The outgoing mail tray and signal flag operate without binding after months of weather. The box meets USPS-STD-7B specifications, so it remains compliant for curbside delivery over its service life. It is not designed for high-security commercial applications that require reinforced steel or anti-pry features.

Installing it and common pitfalls

The mailbox can be bolt-mounted or in-ground mounted on a standard pedestal or deluxe post, and multiple units can share a two-sided deluxe post with spreaders. Mounting hardware for the chosen post type must be sourced separately. A common issue is failing to level the post before securing the box, which can misalign the doors. Another is overlooking the need for a concrete footing when using an in-ground post, leading to instability over time.