There are several Options and Allowed Actions for the Triggered Send Queue. This article explains how to Clear the queue. Also, there is an expiration period for triggered sends that have been queued, find more info here .
Note: As of the August 2021 Release, it is now possible to clear the Queue for Journey Builder Sends.
Note: Before clearing the queue, Export your Triggered Send queue's data for future reference.
Follow this step-by-step video to clear the Triggered Send Queue
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