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If you are seeing messages with 'failed' status (as opposed to 'undelivered') and you believe your messages are being blocked in error, please contact Twilio support with example Message SIDs from your SMS logsand an explanation of your use case. Twilio has anti-spam protections in place to help protect end users from unwanted messaging. Messages with a 'failed' status and error 30004 may indicate that Twilio is blocking those messages due to suspected unwanted or malicious message contents. If you can rule out all of the above issues, continue troubleshooting below.

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Please see International Support for Alphanumeric Sender ID for a full list of countries and more information. If you are sending application-to-person (A2P) SMS to a country where Alphanumeric Sender ID pre-registration is available, such as Saudi Arabia or Malaysia, sending messages without pre-registering may result in error 30004.Ensure you are following these best practices with your messages. Twilio keeps these pages up to date with best practices for each country. Check Twilio’s SMS Guidelines for the country you are sending messages to.Check the Twilio Status Page to see if an active incident could be causing your issues.Possible solutions for error 30004 on 'undelivered' messages include:

For related information, see the information for troubleshooting error 30007. The receiving carrier has blocked the message for violating their rules or policies.

The user is not able to receive your SMS due to specific configuration or limitations of their mobile phone service plan.

The user is registered on a 'Do Not Disturb' or 'Do Not Call' list that blocks SMS from unknown senders.

Possible causes of error 30004 on 'undelivered' messages include: If the message has the 'undelivered' status, this means that delivery of your message failed after Twilio sent the message to the carrier. If a message you sent is not delivered to the end device and returns a 30004 error code, this means that delivery of your message failed because the destination is blocked from receiving this message.