black mailbox slot

Common slot sizes depend on the mailbox type: through‑the‑door or door‑mounted mailboxes often use a narrow slot around 9.8 x 1.8 inches, while larger mail or parcel drop boxes list delivery slots nearer 14 x 2 inches.

Rust‑resistant options include powder‑coated finishes (commonly available in black), rust‑resistant powder coatings, and galvanized steel construction to protect against corrosion.

Design features that reduce water exposure include shields and sloped lids to shed rain, drainage holes and rubber pads to prevent pooling, and rust‑resistant or powder‑coated finishes to limit corrosion.

Common anti‑theft features include internal metal baffles that block fishing, one‑way delivery slots that prevent reach‑ins, keyed locks, and reinforced or thickened steel construction on some parcel boxes.

Many keyed locking mailboxes include two keys (some specify two camlock keys); in other models an integrated combination lock is used instead of keys.