Note: This user was contacted via direct message and their issue was resolved. A summary of that resolution is included below for future reference.
During testing, a high volume of messages were sent within a few seconds. These messages had the same body, were sent to the same recipient, and were from the same originator.
The first messages went through, but then loop prevention was activated, and the following messages were rejected. Once these messages were no longer being sent, loop prevention was deactivated. Then, a new test message reached the recipient upon retry.
To avoid loop prevention, try to limit the number of identical messages sent in a short period of time.
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