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How to hide “All Mail” from IMAP
I would like to hide “All Mail” from my IMAP clients. Since all e-mails show in there I get “two copies” in my “unread mail” filters in my client. Mail.app for example will see both copies and therefore I will have to delete the mail twice. The same is also very annoying when using my iPhone or other e-mail client. Since it’s a “System label” I can’t remove it. The “show” and “hide” feature affects only your web UI.
Source: How to hide “All Mail” from IMAP – Google Product Forums