How can I stop duplicating sent emails in NEW OUTLOOK?

Copper Contributor

Hi. Since my traditional Outlook changed to a New Outlook, I have been struggling to delete every duplicated email sent, which was saved not just in the Sent box but also in the Inbox. With the New Outlook, I cannot find the File tab that I could make those duplicated emails unsaved in the traditional Outlook. Will anyone teach me how to stop copying emails that have been sent in the new version of Outlook? 



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