Delete Spam from Journal Archive

Here's the situation. We have a DVR appliance that for the last year has been sending multiple emails a day to a mailbox, each with a 2mb attachment. Of course our SMTP Journal archive picked up all of that.

Is there a way to cleanly delete 30k messages from an archive without individually selecting and deleting through the web search interface?

Edit: We're on 12.2 so using Discovery Accelerator Privileged Delete isn't an option.

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