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- What's New
- Function Overview
- Service Overview
- Getting Started
-
User Guide
- Topic Management
- Subscription Management
- Message Template Management
- SMN Operation Recording
- Cloud Eye Monitoring
- Logs
- Permissions Management
- Quotas
- Appendix
- Best Practices
-
API Reference
- Before You Start
- API Overview
- Calling APIs
- Getting Started
- APIs
- Examples
- Permissions Policies and Supported Actions
- Public Parameters
- Out-of-Date APIs
- Appendix
- SDK Reference
-
FAQs
- What Are the Advantages of SMN?
- What Protocols Does SMN Support?
- How Is SMN Billed?
- What Are the Requirements for an SMN Topic Name?
- How Many Topics Can I Create?
- How Many Subscriptions Can Be Added to a Topic?
- How Many Messages Can Be Published to a Topic?
- How Many Message Templates Can I Create?
- What Are the Limitations on SMS Messages?
- Can I Add Subscriptions Using Multiple Protocols to a Topic?
- Can a Topic Creator Change Subscription Protocols in a Topic?
- Can I Change a Subscription Endpoint for a Topic?
- Can I Delete a Published Message?
- Does SMN Ensure That Messages Are Received by Subscription Endpoints?
- Will a Subscriber Receive the Same Message Multiple Times?
- Why Do Subscribers Fail to Receive Messages After I Publish Messages to a Topic?
- What Can I Do When Pictures in an Email Message Cannot Be Displayed?
- Does SMN Always Use the Same Phone Number or Sender Name to Send SMS Messages?
- How Do I Obtain My Account ID?
- How Does a DingTalk, Internal DingTalk, Lark, or WeCom Chatbot Obtain Subscription Endpoints?
- Videos
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More Documents
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User Guide (ME-Abu Dhabi Region)
- Overview
- Getting Started
- Topic Management
- Subscription Management
- Message Template Management
- SMN Operation Recording
- Logs
- Permissions Management
- Quotas
-
FAQs
- What Are the Advantages of SMN?
- What Protocols Does SMN Support?
- What Are the Requirements for an SMN Topic Name?
- How Many Topics Can I Create?
- How Many Subscriptions Can Be Added to a Topic?
- How Many Messages Can Be Published to a Topic?
- How Many Message Templates Can I Create?
- Can I Add Subscriptions Using Multiple Protocols to a Topic?
- Can a Topic Creator Change Subscription Protocols in a Topic?
- Can I Change a Subscription Endpoint for a Topic?
- Can I Delete a Published Message?
- Does SMN Ensure That Messages Are Received by Subscription Endpoints?
- Will a Subscriber Receive the Same Message Multiple Times?
- Why Do Subscribers Fail to Receive Messages After I Publish Messages to a Topic?
- What Can I Do When Pictures in an Email Message Cannot Be Displayed?
- How Do I Obtain My Account ID?
- Appendix
- Change History
- API Reference
-
User Guide (Paris Region)
- Overview
- Getting Started
- Topic Management
- Subscription Management
- Message Template Management
- SMN Operation Recording
- Logs
- Quotas
-
FAQs
- What Are the Advantages of SMN?
- What Protocols Does SMN Support?
- What Are the Requirements for an SMN Topic Name?
- How Many Topics Can I Create?
- How Many Subscriptions Can Be Added to a Topic?
- How Many Messages Can Be Published to a Topic?
- How Many Message Templates Can I Create?
- What Are the Limitations on SMS Messages?
- Can I Add Subscriptions Using Multiple Protocols to a Topic?
- Can a Topic Creator Change Subscription Protocols in a Topic?
- Can I Change a Subscription Endpoint for a Topic?
- Can I Delete a Published Message?
- Does SMN Ensure That Messages Are Received by Subscription Endpoints?
- Will a Subscriber Receive the Same Message Multiple Times?
- Why Do Subscribers Fail to Receive Messages After I Publish Messages to a Topic?
- What Can I Do When Pictures in an Email Message Cannot Be Displayed?
- How Do I Obtain My Account ID?
- Appendix
- Change History
- API Reference (Paris Region)
-
User Guide (Kuala Lumpur Region)
- Overview
- Getting Started
- Topic Management
- Subscription Management
- Message Template Management
- SMN Operation Recording
- Logs
- Permissions Management
- Quotas
-
FAQs
- What Are the Advantages of SMN?
- What Protocols Does SMN Support?
- What Are the Requirements for an SMN Topic Name?
- How Many Topics Can I Create?
- How Many Subscriptions Can Be Added to a Topic?
- How Many Messages Can Be Published to a Topic?
- How Many Message Templates Can I Create?
- Can I Add Subscriptions Using Multiple Protocols to a Topic?
- Can a Topic Creator Change Subscription Protocols in a Topic?
- Can I Change a Subscription Endpoint for a Topic?
- Can I Delete a Published Message?
- Does SMN Ensure That Messages Are Received by Subscription Endpoints?
- Will a Subscriber Receive the Same Message Multiple Times?
- Why Do Subscribers Fail to Receive Messages After I Publish Messages to a Topic?
- What Can I Do When Pictures in an Email Message Cannot Be Displayed?
- How Do I Obtain My Account ID?
- Appendix
- Change History
- API Reference (Kuala Lumpur Region)
-
User Guide (Ankara Region)
- Overview
- Getting Started
- Topic Management
- Subscription Management
- Message Template Management
- Permissions Management
- Quotas
-
FAQs
- What Are the Advantages of SMN?
- What Protocols Does SMN Support?
- What Are the Requirements for an SMN Topic Name?
- How Many Topics Can I Create?
- How Many Subscriptions Can Be Added to a Topic?
- How Many Messages Can Be Published to a Topic?
- How Many Message Templates Can I Create?
- Can I Add Subscriptions Using Multiple Protocols to a Topic?
- Can a Topic Creator Change Subscription Protocols in a Topic?
- Can I Change a Subscription Endpoint for a Topic?
- Can I Delete a Published Message?
- Does SMN Ensure That Messages Are Received by Subscription Endpoints?
- Will a Subscriber Receive the Same Message Multiple Times?
- Why Do Subscribers Fail to Receive Messages After I Publish Messages to a Topic?
- What Can I Do When Pictures in an Email Message Cannot Be Displayed?
- How Do I Obtain My Account ID?
- Appendix
- Change History
- API Reference (Ankara Region)
-
User Guide (ME-Abu Dhabi Region)
- General Reference
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Does SMN Ensure That Messages Are Received by Subscription Endpoints?
SMN pushes messages to subscription endpoints asynchronously, which does not ensure the timeliness of message delivery. If your service requires quasi-real-time message delivery, exercise caution whether to use SMN.
If a subscription endpoint is accessible, it will receive all messages delivered by SMN.
If an endpoint is inaccessible, SMN saves the undelivered message in a message queue and tries to deliver it six more times. If the message still fails to be delivered, SMN discards it and does not send the information to the publisher that the message delivery failed.
The interval for re-sending an undelivered message varies depending on the length of the message queue. Usually, an undelivered message is processed within several hours. If a queue has too many undelivered messages, those messages will be processed within a day.
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