Simple Message Notification (SMN) enables you to broadcast messages to email addresses, phone numbers, and HTTP/HTTPS servers and connect cloud services through notifications, reducing system complexity. Efficiently sends messages with three easy-to-use APIs for topic creation, subscription, and message publishing. Saves messages in multiple data centers to achieve high availability. If a message delivery fails, the failed message will be cached and delivered again. Enables you to deliver messages to subscribers using various protocols with only one messaging request. Isolates data by topic. Unauthorized users cannot access your message queues, ensuring service security. Use messages to connect other cloud services, achieving system decoupling and ensuring reliability. If one service becomes faulty, messages sent to other services will not be adversely affected. Connects cloud services and automatically invokes their functions through messages.