empty trash of email accounts at once

As a System Administrator, I would like to be able to empty all trash folders of all email accounts on the server so that I can more effectively manage my server resources and simplify regular account maintenance.

To improve this it could have been done in two ways:

1) per domain - could be at Free up manager at cPanel > emails accounts

2) entire server (reseller account) - all domains at once - should be a WHM option

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It would be great if I could empty all trash folders of emails at once. It could be done at manage free-up emails space.