Question How do you cease all queued outgoing email?

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A client of ours attempted to send out an email newsletter to thousands of their subscribers directly via our mail server.

Whilst we have limitations in place for protection configured in Plesk (a limit of 50 per hour), we'd prefer to just cease all future emails that the client has scheduled (this was done in error and they're already sending the same newsletter via Amazon SES now).



Does anyone know of a way, as per the screenshot above, to cancel all future emails that were sent in this specific action? I don't actually have any idea how they triggered this (whether via their local email client or their website or what)...