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Can Certified Mail® be sent to a P.O. Box?

Woman opening post office box with key.

The answer is yes, Certified Mail® can be sent to a P.O. Box. You simply address the letter to a P.O. Box instead of a street address. If the Certified Mail letter requires a signature from the recipient, the mail carrier will leave a delivery slip (PS Form 3849) inside the P.O. Box instructing the…

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