30453: Message couldn't be delivered

Twilio temporarily blocked delivery to this destination because SMS Pumping Protection flagged traffic to the number as suspicious. This block usually clears after a few hours if no additional fraudulent activity is detected.

• SMS Pumping Protection detected unusual traffic patterns for this destination or matched the traffic to system-known malicious activity.
• Twilio temporarily blocked SMS traffic to the destination number while the fraud check remained active.
• A legitimate recipient was flagged by mistake. False positives are possible, although Twilio works to keep them low.

• Wait a few hours and try the message again. In many cases, the block is temporary and clears if Twilio does not detect additional suspicious activity.
• If the traffic is legitimate and the issue continues, collect at least three affected Message SIDs from the last 24 hours in your SMS logs and open a support request for investigation.
• If you need to send a known legitimate message without applying this risk check, set RiskCheck to disable when you create the Message resource.
• Add trusted destination phone numbers or eligible 1k prefixes to the Global Safe List so they are not blocked by SMS Pumping Protection in the future.

• SMS Pumping Protection for Programmable Messaging
• Create a Message resource
• Global Safe List