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This can be used to delete or archive old mails. In fact, for archiving its a bit different, you need to archive mails with any tools (e.g archivemail), and then deleting (if you want!).
Here we use -path ".*/cur/*" to avoid files limit in bash globbing and to search in any inbox (e.g .mymail .spam .whatever).
! -newermt "1 week ago" can be read: All files which is older than "1 week ago", adapt it in consequence.
Of course, you can adjust "Maildir" to your config...