What is Delivery receipt?

    Also known as: DLR, Delivery report

    A delivery receipt (DLR) is the status update a mobile network returns after an SMS is processed, confirming whether the message reached the handset, is still pending, or failed.

    A receipt is the only reliable proof of delivery. Accepting a message at the API means it was queued, not that it arrived — the DLR that follows seconds or minutes later carries the real outcome.

    Typical statuses are delivered, failed, expired and rejected. Failures usually mean a disconnected number, a handset that stayed off past the validity period, or a network block.

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