Hi Leita,
Thanks for reaching out. The issue you're experiencing with duplicate sent emails is often related to how email clients handle IMAP accounts. Many IMAP servers automatically save a copy of sent emails, and if your email app is also set to save a copy, this can result in duplicates. Open Outlook. > Go to File > Account Settings > Account Settings. Select your email account and click Change. > Click More Settings, then go to the Sent Items tab. >Select “Do not save copies of sent items”. > Click OK, then Next, and Done.
This should stop the duplication. If you're using a different email app, let me know and I’ll guide you through the steps for that one.