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I'm not sure if this feature exists. But, as an administrator, I wouldn't mind the ability to turn on a message recall feature. Providing my users 30 seconds or so to recall a message before it is actually sent. There are a lot of times that mistakes are noticed within the first 10 seconds of pressing send, and it would be incredibly helpful if there was a "Recall" button on the toolbar at the top with a countdown. Just a thought.