delete mail
I've emptied all emails from the Mail app, yet when I'm on storage management it keeps telling me it's 3GB in there. I've given it over 30mins to refresh just in case and same problem persists
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"Delete" an email moves it to mail's [private] Trash folder. To get rid of them forever, you need to use:
Mail > Mailbox > Erase deleted Items ≥ ... in all Accounts