Is there a way to stop Apple Mail.app to stop creating duplicates of IMAP gmail emails?

What I do is selectively disable the filters/labels in Gmail that I don't want to have appear in Mail.app. Since Gmail stores a copy of each message in the inbox, the All Mail folder, and any additional labels that might be assigned to a message, you can disable those folders from showing up in IMAP access. First, you have to enable Advanced IMAP Controls in the Labs settings

Then, under the Labels setting, uncheck all the labels you don't want to have appear in Mail.app.

I would uncheck the All Mail label, since that gives you a copy of every single email that you don't trash.

After that, just quit and restart Mail. App, give it a few mins to sync up, and you should be good.

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