Your message was rejected by the downstream carriers for exceeding the rate limits allowed by your campaign.
Rarely, you may receive this error for sending too many messages to the same phone number in a short time frame.

Possible Causes

You are sending messages at a rate higher than allowed by the carriers for your campaign type.
You might be sending too many messages to the same phone number in a short timeframe.

Possible Solutions

Slow down your rate of message sending.

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