What must be done with undeliverable Standard mail?

Undeliverable Standard mail must be returned to the sender. This policy is in place to ensure that mail is managed properly according to postal regulations. When Standard mail is undeliverable, the postal service takes responsibility for ensuring that it reaches the sender, preserving the integrity of the mailing system and maintaining trust between senders and the postal service.

Returning undeliverable items to the sender facilitates re-addressing or other corrective actions that might be necessary, as the sender can resend it to the correct address if needed. This process also helps to prevent the accumulation of undeliverable items, ensuring that the postal system remains organized and efficient.

Other options suggest discarding the mail, forwarding it, or keeping it at the post office, all of which do not align with the established postal regulations for handling undeliverable Standard mail. Each of these alternatives could lead to issues such as loss of mail, incorrect deliveries, or a backlog of unprocessed items, which is why returning to sender is the established protocol.