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Twilio Error 21610

The recipient has opted out of receiving messages from your Twilio number.

Understanding Twilio: A Powerful SMS Communication API

Twilio is a leading cloud communications platform that enables developers to programmatically send and receive SMS messages, make and receive phone calls, and perform other communication functions using its web service APIs. It is widely used in applications that require robust and scalable communication solutions.

Identifying the Symptom: Error 21610

When using Twilio's SMS API, you might encounter Error 21610. This error indicates that a message you attempted to send was not delivered because the recipient has opted out of receiving messages from your Twilio number.

Exploring the Issue: What is Error 21610?

Error 21610 is a common issue faced by developers using Twilio's SMS services. It occurs when a recipient has previously opted out of receiving messages from your Twilio number. This is part of Twilio's compliance with messaging regulations, ensuring that users have control over the messages they receive.

Why Does This Happen?

This error is triggered when a recipient sends a 'STOP' message to your Twilio number, indicating they no longer wish to receive messages. Twilio automatically blocks further messages to that recipient from your number to comply with their request.

Steps to Fix Error 21610

To resolve this issue, you need to have the recipient opt back in to receive messages from your Twilio number. Here are the steps to do so:

Step 1: Communicate with the Recipient

Reach out to the recipient through an alternative communication method and inform them about the situation. Explain that they have opted out of receiving messages and need to opt back in if they wish to continue receiving messages.

Step 2: Request Opt-In

Ask the recipient to send the word 'START' to your Twilio number. This action will opt them back in, allowing them to receive messages from your number again.

Step 3: Verify Opt-In Status

Once the recipient has sent 'START', you can verify their opt-in status through Twilio's API. Use the following command to check the recipient's status:

twilio api:core:messages:list --from="YOUR_TWILIO_NUMBER" --to="RECIPIENT_NUMBER"

This command will list messages and their statuses, confirming that the recipient is opted in.

Additional Resources

For more information on managing opt-out and opt-in processes, visit Twilio's official documentation on SMS Opt-Out. You can also explore Twilio's API Reference for more technical details.

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