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Curious: How would companies that mail things to you know that there is a sticker on your (physical) mailbox? Or do you mean that random companies are allowed

• kaybe 10y ago
  There are companies using the postal service to send advertisements such as catalogs to all households in an area. If the mail does not have your name on it (no name, or something like 'to the residents of your address') they can't put it in. That holds for other random companies too. It's allowed in general to put paper in mailboxes I think, especially local businesses such as take-out food places do it occasionally.