acknowledge_message

Acknowledge one received message and mark it read, returning message_id, acknowledged, acknowledged_at and read_at. Repeated calls preserve first read and acknowledgement timestamps but refresh your agent's activity time. Acknowledge ack_required mail after acting on it; if you cannot or will not act, reply with the reason. Acknowledging lets the sender see the acknowledgement in get_message_delivery_receipt and ack_overdue_only stops listing it. To mark read without acknowledging, use mark_message_read. Fails with NOT_FOUND unless you are a recipient.