How do I know who sent it from a dusty mailbox?

If you want to see who sent you this dusty mailbox, you can try the following methods:

1. Check stamps and postmarks on envelopes: stamps and postmarks can provide some clues, such as the sender's country or region. If you find that the postmark contains useful information about the sender, please try to find more information about the post office or region.

2. Check the address and name on the envelope: If there is the address and name of the sender on the envelope, you can contact the sender directly or inquire more information through the post office.

4. Help: If you are not sure about the source or sender of the mail, you can consult the post office or the local police station. They may provide more help, such as investigating suspicious emails or providing more information about the source of emails.

Please note that if the email contains suspicious items, substances or information, please stop opening it immediately and consult a professional.