Simple Mechanical "Mail Arrived" Indicator/Flag

Tired of wondering whether the mail has arrived yet? This simple mechanical mail indicator provides an easy visual signal whenever your mailbox has been opened.

The design works entirely mechanically — no batteries, electronics, magnets, or sensors required. When the mailbox door is opened, the flag on the indicator is lifted by the movement of the mailbox door itself. After the door closes, the flag remains raised, clearly indicating that the mailbox has been opened and mail has likely been delivered.

To reset the indicator, simply lower the flag manually after retrieving your mail.

This design is ideal for standard curbside mailboxes and can be mounted in a variety of ways depending on your mailbox style. The mechanism is intentionally simple for reliability and long-term outdoor use.

Features:

Fully mechanical operation
No batteries or electronics required
Automatically raises flag when mailbox door is opened
Flag remains raised after door closes
Simple reset by lowering the fl